🤖

Prompt Template Builder

Fill {{variables}} in prompt templates with key=value data.

🤖

Prompt Variable Extractor

Extract {{variable}} placeholders from prompt templates.

🤖

Prompt Cleaner

Clean extra spaces, blank lines and invisible characters while keeping paragraph structure.

🤖

Prompt Length Estimator

Estimate characters, words, CJK characters and approximate tokens for prompts.

🤖

Few-shot Prompt Builder

Combine instructions, examples and input into a few-shot prompt.

🤖

AI Chat Log Cleaner

Clean exported chat logs by removing timestamps, speaker prefixes and extra blank lines.

🤖

JSONL Validator

Validate JSONL/NDJSON datasets line by line and summarize fields.

🤖

JSONL Train/Validation Splitter

Split JSONL data into train and validation sets by percentage.

🤖

Prompt Section Splitter

Split long prompts by headings, blank lines or separators and summarize each section.

🤖

Prompt Redaction Helper

Redact emails, phones, URLs, keys and long numbers before sending prompts to AI.

🤖

AI Chat to Messages JSON

Convert user/assistant/system transcripts into messages JSON or JSONL.

🤖

LLM Evaluation Prompt Template

Generate reusable answer-evaluation prompts with task, criteria and score scale.

🤖

RAG Chunk Planner

Preview RAG document chunk boundaries by character size and overlap.

🤖

Token Budget Splitter

Split a total token budget across system prompt, history, retrieval and output reserve.

🤖

AI Persona Card Generator

Generate AI persona/system prompts with role, goals, boundaries and output format.

🤖

Prompt Test Case Generator

Generate normal, edge, error and multilingual prompt test cases from a task description.

🤖

Prompt Constraint Checklist

Generate a human-review checklist of constraints from a prompt.

🤖

System Prompt Skeleton Builder

Build system prompt skeletons from identity, capabilities, limits, safety boundaries and output format.

🤖

Embedding Cost Estimator

Estimate embedding processing cost from text size, chunk size and price per million tokens.

🤖

AI Output Difference Summary

Compare two AI outputs and summarize added, removed and common sentences.

🤖

Prompt Risk Audit

Check prompts for sensitive data, overreach, unclear format and missing safety boundaries.

🤖

Prompt Output Schema Generator

Generate JSON output schema text for prompts from field descriptions.

🤖

RAG Query Expander

Generate synonym, specific, broad and keyword-style retrieval queries from a question.

🤖

Dataset Labeling Instructions Generator

Generate labeling instructions from task, labels and edge cases.

📝

JSON Formatter

Format, compress, validate

🔗

JSON Escape/Unescape

String escape & unescape

🔄

JSON Diff

Deep structure comparison

⚡

JS Formatter

JavaScript code beautifier

📄

HTML/XML Formatter

Code beautify & minify

🏷️

HTML Encoder/Decoder

Entity encode & decode

⚡

HTML to JS

HTML to JavaScript string

📊

HTML Table Generator

Visual table editor

🔒

JS Obfuscator

JavaScript code protection

💡

Code Highlighter

Syntax highlighting

📸

Code to Image

Code snippet to shareable image

🗃️

SQL Formatter

SQL beautify & minify

📝

Markdown Editor

Live preview Markdown

🔍

Regex Tester

Real-time match & capture

🔄

XML/JSON Converter

Format conversion

✨

CSS3 Generator

Border-radius, shadow, transform

🔘

CSS Button Generator

Visual button designer

⏰

Crontab Generator

Visual cron expression

📏

Px/Rem Converter

CSS unit conversion

🔢

ASCII Table

128 ASCII character reference

🌐

HTTP Status Codes

HTTP status code reference

📄

MIME Types

File extension to MIME lookup

⌨

Keyboard Tester

Key press detection & info

💻

Screen Info

Viewport/resolution/DPR

🔄

CSV/JSON Converter

CSV & JSON format conversion

🔑

JWT Decoder

JWT Token decode & inspect

🎨

CSS Formatter/Minifier

CSS beautify & compress

📦

HTML Minifier

HTML code compressor

⚡

JS Minifier

JavaScript code compressor

💻

CSS Flexbox Playground

Visual flex layout builder with live preview.

💻

CSS Grid Generator

Visual CSS Grid layout builder with live preview.

💻

CSS @keyframes Animation Builder

Visual CSS animation generator with live preview.

💻

CSS Loaders

Pure CSS loading spinners.

💻

CSS Selector Tester

Real-time CSS selector debug.

💻

CSS Variables Generator

Build design token systems with CSS custom properties.

💻

curl Command Converter

Convert curl commands to fetch, axios, Python requests and more.

💻

.gitignore Generator

Generate gitignore for any project stack.

💻

INI to JSON Converter

Convert INI configs to JSON and back.

💻

JSON Schema Generator

Infer JSON Schema from sample JSON.

💻

JSON to Go Struct

JSON to Go struct generator.

💻

JSON to TypeScript

Generate TS interfaces from JSON.

💻

JSONPath Tester

Evaluate JSONPath expressions online.

💻

JWT Generator

Sign JWT tokens with HMAC algorithms in your browser. Perfect for...

💻

Markdown ↔ HTML

Two-way Markdown HTML conversion.

💻

Markdown Link Extractor

Extract all links from Markdown documents.

💻

Markdown Table Generator

Build Markdown tables visually with cell editing and CSV paste.

💻

Markdown TOC Generator

Auto-generate table of contents from MD headings.

💻

Mock Data Generator

Generate fake data for testing in JSON, CSV or SQL.

💻

OpenGraph Preview

Preview how your link looks on Twitter, Facebook, LinkedIn and Slack.

💻

SVG Optimizer

Strip and shrink SVG files.

💻

SVG Viewer & Cleaner

Preview SVG live and clean up unnecessary code.

💻

Tailwind CSS Class Lookup

Search Tailwind utility classes and see their CSS.

💻

Token Counter for LLMs

Estimate token count and API cost for LLM prompts.

💻

XPath Tester

Online XPath evaluator.

💻

YAML Formatter & Validator

Free online YAML formatter, validator and beautifier. Convert YAML to JSON...

💻

BIP39 Mnemonic Generator

Generate BIP39 wallet mnemonics for learning and testing.

💻

TOML ↔ JSON Converter

Convert TOML configuration files to and from JSON.

💻

GraphQL Formatter

Format GraphQL queries, mutations and schema snippets.

💻

OpenAPI Viewer

Parse OpenAPI JSON/YAML and extract paths, methods and summaries.

💻

JSON to Zod

Infer a Zod validation schema from sample JSON.

💻

RSA Key Generator

Generate RSA public/private PEM keys locally with WebCrypto.

💻

CSR Generator

Generate a certificate signing request and RSA private key.

💻

CSV to SQL

Convert CSV rows into SQL INSERT statements.

💻

JSON Flatten

Convert nested JSON into a flat object with dot paths.

💻

JSON Unflatten

Restore flat dot-path objects into nested JSON.

💻

.env to JSON

Parse .env environment variable files into JSON objects.

💻

Properties to JSON

Convert Java .properties configuration files to JSON.

💻

SQL Minifier

Remove SQL comments and collapse unnecessary whitespace.

💻

CSS clamp Generator

Generate responsive CSS clamp() from min/max size and viewport width.

💻

CSS Specificity Calculator

Calculate CSS selector specificity and sort selectors by weight.

💻

SVG Data URI Encoder

Convert SVG code into data:image/svg+xml URIs for CSS/HTML.

💻

Markdown Front Matter Parser

Parse YAML front matter from Markdown and separate body content.

💻

Env Template Renderer

Replace ${VAR} placeholders in templates using .env values.

💻

CSV to CREATE TABLE

Infer a SQL CREATE TABLE statement from CSV headers and sample rows.

💻

GraphQL Minifier

Remove comments and extra whitespace from GraphQL queries.

💻

Cron Expression Explainer

Explain common 5-field Cron expressions in readable text.

💻

SemVer Version Compare

Compare two semantic versions and report ordering plus change level.

💻

Chmod Permission Calculator

Convert rwx symbolic permissions to 3-digit octal chmod permissions.

💻

CSP Header Builder

Generate Content-Security-Policy response headers and meta tags.

💻

CORS Header Generator

Generate CORS response headers from origin, methods, headers and credential settings.

💻

HTTP Cache-Control Generator

Generate caching headers for static assets, HTML, APIs or no-store responses.

💻

Nginx Redirect Config Generator

Generate Nginx rewrite/location redirects from source path, target URL and status code.

💻

.htaccess Redirect Generator

Generate Apache .htaccess Redirect or RewriteRule redirect rules.

💻

.dockerignore Generator

Generate .dockerignore templates for Node, Python, Java, Go or generic projects.

💻

Docker Run Command Builder

Build docker run commands from image, ports, environment variables and volume mounts.

💻

.env Diff Checker

Compare two .env files and report added, removed and changed variables.

💻

JSON Pointer Query

Query JSON with RFC 6901 JSON Pointer or list all available paths.

💻

package.json Scripts Extractor

Extract package.json scripts and generate npm/yarn/pnpm command lists.

💻

HTTP Request Builder

Generate fetch, curl or raw HTTP request text for API debugging.

💻

API Mock Response Generator

Generate mock JSON responses from field definitions.

💻

OpenAPI Path Extractor

Extract paths, methods and summaries from OpenAPI JSON/YAML text.

💻

.env Sorter

Sort .env files by key, preserve comments and remove duplicate keys.

💻

YAML Key Sorter

Sort top-level keys in simple YAML for easier config review.

💻

Git Branch Name Generator

Generate normalized Git branch names from type, issue number and description.

💻

Version Bump Planner

Generate the next SemVer version from the current version and change type.

💻

Docker Compose Service Generator

Generate docker compose service snippets from image, ports, env vars and volumes.

💻

Kubernetes Resource YAML

Generate Deployment container requests/limits resource snippets.

💻

Logfmt Parser

Parse logfmt log lines into JSON objects.

💻

JSON Schema Required Checker

Extract required fields from JSON Schema and check whether sample JSON misses fields.

💻

Base64 Image Size Reader

Read PNG, JPEG, GIF and WebP dimensions from Data URL/Base64 images.

💻

Regex Replace Preview

Preview text replacement using a regular expression and replacement template.

💻

URL Domain Extractor

Extract domains, paths and unique host lists from URL lists.

💻

JSON Key Sorter

Recursively sort JSON object keys for config review, snapshots and version control.

💻

JSON Size Analyzer

Count JSON bytes, nodes, max depth, arrays and objects to assess API response size.

💻

JSON Merge Patch Tool

Apply an RFC 7386-style merge patch to target JSON, where null deletes a field.

💻

YAML / JSON Converter

Convert between simple YAML and JSON for small configuration snippets.

💻

HTML Tag Counter

Count tag usage in an HTML snippet for quick page structure review.

💻

SRI Hash Generator

Generate sha256/384/512 Subresource Integrity hashes from local text.

💻

CSP Inline Hash Generator

Generate Content-Security-Policy sha256 hashes for inline scripts or styles.

💻

JWT Expiry Checker

Decode JWT payload exp, iat and nbf fields and show local time plus remaining time.

💻

SQL IN Clause Builder

Convert multi-line IDs or text values into a safe SQL IN (...) clause with quote escaping.

💻

JSON Path List Extractor

Recursively list JSON field paths, types and value previews for API inspection.

💻

JSON to .env Converter

Convert flat or nested JSON into uppercase underscore .env variables.

💻

.env to YAML

Convert .env key=value configuration into simple YAML for config migration.

💻

SQL SELECT Builder

Generate SELECT queries from table, fields, WHERE, ORDER BY and LIMIT.

💻

SQL UPDATE Builder

Generate UPDATE statements from table, SET fields and WHERE conditions.

💻

Bulk UUID Validator

Validate multiple UUID strings and summarize valid v1-v5 format counts.

💻

SemVer Range Checker

Check whether versions satisfy simple >=, >, <=, < and = constraints.

💻

Cron Field Explainer

Explain wildcard, step, range and list syntax inside a single cron field.

💻

Basic Auth Header Generator

Generate HTTP Basic Authorization headers from username and password.

💻

cURL Header Extractor

Extract -H headers from cURL commands and output JSON or key:value lines.

💻

XML Formatter

Format XML text and check basic syntax errors for API and config review.

💻

XML Minifier

Remove whitespace between XML tags and comments to output compact XML.

💻

package.json Dependency Sorter

Sort dependencies, devDependencies and peerDependencies alphabetically for review.

💻

OpenAPI Tag Summary

Summarize OpenAPI JSON operations by tag with counts and paths.

💻

GraphQL Operation Extractor

Extract query, mutation and subscription operation names from GraphQL text.

💻

SQL Column List Extractor

Extract column names from SELECT or CREATE TABLE SQL for API mapping and docs.

💻

.env to Compose Environment

Convert .env content into a docker compose environment YAML snippet.

💻

Kubernetes env Var YAML

Convert key=value environment variables into Kubernetes container env arrays.

💻

TOML Key List Extractor

Extract section.key paths from TOML text.

📊

Text Counter

Characters, words, lines

📝

Text Diff

Highlight differences

🔠

Case Converter

camelCase, snake_case, etc.

🔤

Unicode Converter

Unicode/Text/UTF-8

🔤

Chinese Pinyin

Hanzi to Pinyin with tones

繁

Simplified/Traditional

Chinese character conversion

📋

Text Sort & Deduplicate

Sort/deduplicate/shuffle lines

📝

Lorem Ipsum

Placeholder text generator

📝

Anagram Solver

Find all letter rearrangements of a word.

📝

ASCII Art Generator

Text and image to ASCII art conversion.

📝

Find and Replace

Regex find and replace text tool.

📝

Morse Code Translator

Text to Morse code with audio playback.

📝

Reading Time Calculator

Estimate how long it takes to read any article.

📝

Roman Numeral Converter

Convert numbers to Roman numerals and back instantly.

📝

URL Slug Generator

Convert any text to clean SEO-friendly URL slugs instantly.

📝

Title Case Converter

AP/Chicago/MLA style title case conversion.

📝

Word Frequency Counter

Analyze word counts in any text.

📝

HTML Tag Remover

Remove HTML tags and extract clean plain text.

📝

CSV Dedupe

Remove duplicate CSV rows by whole row or selected column.

📝

CSV Sort

Sort CSV data by a selected column in ascending or descending order.

📝

CSV Filter

Filter CSV rows by column name and keyword.

📝

CSV Splitter

Split CSV data into chunks by row count.

📝

TSV/CSV Converter

Convert between tab-separated TSV and comma-separated CSV.

📝

Line Prefix/Suffix Adder

Add prefixes, suffixes or line numbers to every line.

📝

Duplicate Line Finder

Find duplicate lines and report occurrence counts.

📝

List Randomizer

Shuffle multi-line lists for drawings, ordering and sampling.

📝

Text Minifier

Collapse extra spaces, line breaks and tabs into compact one-line text.

📝

Word Wrap

Wrap text at a chosen column width for email, terminal and comments.

📝

JSON Array to JSONL

Convert JSON arrays into line-delimited JSONL/NDJSON.

📝

JSONL to JSON Array

Convert line-delimited JSONL/NDJSON into a standard JSON array.

📝

CSV Column Extractor

Extract selected CSV columns by header name and output a new CSV.

📝

CSV Column Renamer

Rename CSV headers in bulk using old=new mappings.

📝

CSV Stats Summary

Detect numeric columns and calculate count, min, max, sum and average.

📝

CSV to Markdown Table

Convert CSV data into GitHub-style Markdown tables.

📝

HTML Table to CSV

Extract cells from HTML table code and convert them to CSV.

📝

Bullet List Cleaner

Normalize mixed bullet, numbered and indented list formats.

📝

Fixed Width to CSV

Split fixed-width text by column widths and output CSV.

📝

CSV Transpose

Swap rows and columns in CSV for small table cleanup.

📝

CSV Inner Join

Inner join two small CSV tables by a shared column.

📝

CSV Pivot Count

Group CSV rows by a chosen column and count records.

📝

Line Sampler

Sample first, last or random N lines from multi-line text.

📝

Text Sliding Window Splitter

Split text into overlapping windows by window size and step.

📝

Regex Match Extractor

Extract all regex matches from text, including full match or a selected group.

📝

N-gram Generator

Generate word-level n-grams from text and count frequencies.

📝

Unicode Normalizer

Normalize text between NFC, NFD, NFKC and NFKD forms.

📝

Delimited Text Converter

Convert delimited text between comma, tab, semicolon and pipe separators.

📝

Markdown to Plain Text

Remove Markdown syntax while keeping headings, link text and list content for plain text use.

📝

HTML to Plain Text

Convert HTML snippets into readable plain text for email, webpage and rich-text cleanup.

📝

CSV to JSON Schema

Infer JSON Schema field types from CSV headers and sample values.

📝

CSV Column Profiler

Profile CSV columns with non-empty counts, unique counts, inferred types and numeric ranges.

📝

English Readability Score

Estimate Flesch Reading Ease, sentence count, word count and average word length.

📝

Duplicate Sentence Remover

Remove duplicate sentences while preserving first occurrence order.

📝

Bulk Slug Generator

Convert multiple titles into URL slugs for articles, tool pages and product pages.

📝

Template Placeholder Replacer

Replace {{key}} placeholders in a template with key=value data.

📝

Markdown Task Counter

Count completed, open and completion rate for Markdown task lists.

📝

Email List Cleaner

Extract email addresses from text, lowercase, deduplicate and sort them.

📝

Phone List Normalizer

Extract phone numbers from text, remove separators and output one per line.

📝

Stopword Remover

Remove common English stopwords using built-in and custom stopword lists.

📝

Acronym Extractor

Extract uppercase acronyms and parenthesized definitions from text for document review.

📝

Sentence Numberer

Split paragraphs into numbered sentences for review and sentence-level feedback.

📝

Paragraph Wrapper

Rewrap paragraphs to a chosen character width while preserving blank lines.

📝

Duplicate Word Finder

Find consecutive duplicate English words such as the the or is is.

📝

Initials Generator

Generate initials from names or phrase lists.

📝

URL Extractor

Extract URLs from any text, deduplicate and output one per line.

📝

Hashtag Extractor

Extract hashtags from text, deduplicate and count occurrences.

📝

Mention Extractor

Extract @username mentions from text, deduplicate and count occurrences.

📝

Duplicate Paragraph Finder

Find duplicate paragraphs and their counts in multi-paragraph text.

📝

CSV to HTML Table

Convert CSV data into HTML table code with escaped cells.

📝

Markdown Image Extractor

Extract image alt, src and title values from Markdown.

📝

Text Line Length Checker

Flag lines longer than a chosen width for code blocks, email and docs.

📝

Whitespace Visualizer

Render spaces, tabs and newlines as visible markers for format debugging.

🔐

Base64 Encoder/Decoder

Text & Base64 conversion

🔗

URL Encoder/Decoder

URL encode & decode

🔑

Hash Calculator

MD5/SHA multi-algorithm

🔒

Encryption Tool

AES/DES/RSA encryption

🔢

Number Base Converter

Bin/Oct/Dec/Hex

🆔

UUID Generator

v1/v4 UUID batch generate

⏱️

Timestamp Converter

Timestamp & date conversion

🔐

Bcrypt Hash Generator & Verifier

Generate and verify bcrypt password hashes in browser.

🔐

Binary Text Converter

Convert text to binary and back, with UTF-8 support.

🔐

Cookie Parser

Decode HTTP Cookie and Set-Cookie headers.

🔐

HMAC Calculator

Compute HMAC-SHA1/256/384/512 in browser.

🔐

htpasswd Generator

Generate Apache/Nginx basic auth credentials.

🔐

ISO 8601 Duration Converter

Parse and build ISO 8601 duration strings.

🔐

TOTP / 2FA Generator

Generate 2FA codes from a Base32 secret in browser.

🔐

ULID Generator

Time-sortable unique ID generator.

🔐

File Hash Calculator

Calculate SHA-1, SHA-256, SHA-384 and SHA-512 hashes for local files.

🔐

File to Base64

Convert any local file to a Base64 Data URL.

🔐

File Splitter

Split a local file into downloadable chunks by size.

🔐

MIME Sniffer

Read file signatures to identify PNG, JPEG, PDF, ZIP, GIF, WebP and more.

🔐

Data URI Generator

Generate Data URIs from files or text for HTML/CSS embedding.

🔐

URL Parser

Parse URL protocol, host, path, query parameters, hash and port.

🔐

Query String Builder

Append parameter lists to a URL and encode query strings automatically.

🔐

Base64URL Encoder/Decoder

Convert between plain text and URL-safe Base64URL.

🔐

Text/Hex Converter

Convert UTF-8 text to hex bytes or decode hex back to text.

🖼️

Image Crop & Compress

Crop, compress, convert

🔄

Base64 to Image

Base64 string to image

🔄

Image Format Converter

WebP/PNG/JPG conversion

🧩

Image Merge

Horizontal/vertical stitch

📐

Image Resizer

Resize & scale images

🖼️

SVG to PNG

Vector to bitmap

💧

Image Watermark

Text watermark & opacity

🌅️

Placeholder Image

Custom size placeholder

👁

Color Blind Simulator

Color vision deficiency sim

🖼️

EXIF Viewer

Read EXIF metadata from photos.

🖼️

Image Color Extractor

Extract dominant color palette from any image.

🖼️

Image Diff

Compare two images visually with pixel-level highlighting.

🖼️

PDF Compress

Reduce PDF file size in your browser.

🖼️

PDF Merge

Combine multiple PDFs into one, browser-based.

🖼️

PDF Split

Extract pages from a PDF in browser.

🖼️

PDF Rotate

Rotate PDF pages locally in the browser and download a new file.

🖼️

Delete PDF Pages

Delete PDF pages by range, processed locally in the browser.

🖼️

Reorder PDF Pages

Reorder PDF pages by a custom page order.

🖼️

Add PDF Page Numbers

Add page numbers to every PDF page with start number and position.

🖼️

PDF Metadata Viewer

View PDF title, author, page count, file size and metadata.

🖼️

PDF Text Extractor

Extract selectable text from PDF pages.

🖼️

HEIC to JPG

Convert iPhone HEIC/HEIF images to JPG.

🖼️

AVIF Converter

Convert browser-decodable AVIF/images to PNG, JPG or WebP.

🖼️

Image to ICO

Convert an image into a 32x32 ICO favicon file.

🖼️

EXIF Cleaner

Remove EXIF and GPS metadata by re-encoding images.

🖼️

9-Grid Image Splitter

Split an image into a 3x3 grid and download a ZIP.

🎥

Video Metadata Viewer

Read video duration, resolution, file size and MIME type locally.

🎥

Video Snapshot Extractor

Capture a PNG frame from a local video at a chosen time.

🎥

Audio Metadata Viewer

Read audio duration, file size and MIME type locally.

🎥

Audio Trimmer

Trim audio locally in the browser and export a WAV file.

🖌️

Color Picker

Visual color picker

🎨

Color Converter

RGB/HEX/HSL all formats

🎭

Color Palette

Curated color schemes

🌈

Gradient Generator

CSS linear/radial gradient

🎰

Random Color

Batch random colors

🎨

Aspect Ratio Calculator

Calculate proportional dimensions for any aspect ratio.

🎨

border-radius Generator

Visual rounded-corner builder.

🎨

CSS box-shadow Generator

Visual CSS shadow builder.

🎨

CSS clip-path Generator

Visual CSS clip-path generator with drag-to-edit shapes.

🎨

cubic-bezier Editor

Visual CSS easing curve editor with live preview.

🎨

Glassmorphism Generator

Frosted glass CSS effect.

🎨

CSS text-shadow Generator

Visual CSS text shadow editor with live preview.

🎨

WCAG Contrast Checker

Color accessibility AA/AAA compliance.

💼

Meeting Agenda Generator

Generate clear meeting agendas from title, goals, topics and duration.

💼

Meeting Minutes Generator

Turn attendees, decisions and action items into Markdown meeting minutes.

💼

Action Item Extractor

Extract TODO, Action, owner and due-date clues from meeting text.

💼

Email Template Generator

Generate editable email drafts from purpose, recipient, tone and key points.

💼

Timesheet Calculator

Calculate daily and total work hours from date, time ranges and break minutes.

💼

Project Status Report Generator

Turn done items, next steps, risks and metrics into a project status report.

💼

Packing List Generator

Generate checklist-style packing lists by trip type, days, weather and people.

💼

Decision Log Generator

Generate decision records with context, options, decision, owner and date.

💼

OKR Planner

Turn objectives and key results into a trackable OKR template.

💼

SMART Goal Generator

Break a goal into Specific, Measurable, Achievable, Relevant and Time-bound parts.

💼

SOP Template Generator

Generate SOP documents with purpose, scope, steps, checkpoints and owners.

💼

Risk Register Generator

Generate risk registers from risk, probability, impact and mitigation rows.

💼

Stakeholder Map Generator

Generate project stakeholder maps from name, role, influence and interest.

💼

Invoice Template Generator

Generate simple invoice text templates from seller, buyer, items and totals.

💼

Daily Standup Generator

Organize yesterday, today, blockers and metrics into a daily standup update.

💼

Workback Plan Generator

Generate a workback plan from a deadline and task list.

💼

User Story Generator

Generate a standard As a / I want / so that user story from role, need and value.

💼

Acceptance Criteria Generator

Generate Given / When / Then acceptance criteria drafts from a feature and rules.

💼

Test Plan Generator

Generate a lightweight test plan from scope, risks and test case ideas.

💼

Bug Report Template Generator

Generate a bug report with environment, reproduction steps, expected and actual results.

💼

RACI Matrix Generator

Generate a responsibility assignment CSV from task|R|A|C|I rows.

💼

Release Notes Generator

Generate release notes from version, added, fixed and changed lists.

💼

SWOT Matrix Generator

Generate a SWOT analysis matrix from strengths, weaknesses, opportunities and threats.

💼

PESTLE Analysis Template

Generate a Political, Economic, Social, Technological, Legal and Environmental analysis table.

💼

Eisenhower Matrix Generator

Classify tasks into Eisenhower quadrants by urgency and importance.

💼

Stakeholder Email Draft

Draft a project update email from audience, topic, update and request.

💼

Project Timeline Generator

Generate a project timeline from phases, start date and interval days.

💼

Decision Brief Generator

Generate a one-page decision brief from context, options, recommendation and risks.

💼

PRD Outline Generator

Generate a PRD outline from product, goal, users and features.

💼

Feature Brief Generator

Generate a feature brief with background, goals, scope, non-goals and metrics.

💼

User Interview Script Generator

Generate interview intro, questions and wrap-up from research goal and audience.

💼

Meeting Timebox Agenda

Generate a timeboxed agenda from topics and total meeting duration.

💼

Retrospective Board Generator

Generate Start / Stop / Continue or Went well / To improve retrospective boards.

💼

OKR Check-in Generator

Generate OKR check-in text from objective, KR progress, confidence and risks.

🎓

Flashcard Generator

Convert vocabulary, definitions or Q&A lists into Anki/Quizlet-friendly flashcards.

🎓

Quiz Question Template Generator

Generate editable quiz question templates from topic, key points and question type.

🎓

Cloze Deletion Generator

Convert keywords in sentences into Anki cloze deletion format.

🎓

Cornell Notes Template

Organize topic, cues, notes and summary into Cornell notes format.

🎓

Study Plan Generator

Generate daily study plans from a goal, day count and topic list.

🎓

Citation Formatter

Generate APA/MLA-style citations from title, author, year and URL.

🎓

Bibliography Sorter

Sort and deduplicate bibliography entries by author or title.

🎓

Vocabulary List Builder

Organize words, definitions and examples into Markdown or CSV vocabulary lists.

🎓

Reading Summary Template

Generate reading notes with key ideas, evidence, questions and actions.

🎓

Final Exam Score Needed

Calculate the final exam score needed from current grade, final weight and target grade.

🎓

Rubric Generator

Generate a grading rubric from criteria and level count for learning or project review.

🎓

Lesson Plan Generator

Generate a lesson plan from topic, objectives, duration and activities.

🎓

Concept Map Outline

Convert a central topic and concept hierarchy into a concept-map-style Markdown outline.

🎓

Spaced Repetition Plan

Generate a 1/3/7/14/30 day review schedule from a start date and topics.

🎓

Syllabus Outline Generator

Generate a syllabus outline from course topic, weeks and modules.

🎓

Reading Questions Generator

Generate comprehension, analysis and extension questions from reading topic and key points.

🎓

Learning Objectives Generator

Turn topics into measurable Bloom-style learning objectives.

🎓

Essay Outline Generator

Generate a structured writing outline from topic, thesis and paragraph count.

🎓

Thesis Statement Generator

Generate a clear thesis statement from topic, stance and reasons.

🎓

Lab Report Template Generator

Generate a lab report template from experiment name, purpose, materials and steps.

🎓

Math Worksheet Generator

Generate basic arithmetic worksheet questions and answers.

🔢

Online Calculator

Standard arithmetic

🧮

Scientific Calculator

Trig, log, power functions

⚖️

BMI Calculator

Body mass index

📅

Date Calculator

Date add/subtract & interval

📈

Compound Interest

Investment returns calculator

🏠

Mortgage Calculator

Equal installments/principal

💼

Workday Calculator

Exclude weekends

💰

RMB Uppercase

Number to Chinese currency

📏

Length Converter

Meter/cm/inch conversion

💾

Storage Converter

B/KB/MB/GB/TB conversion

🌡️

Temperature Converter

℃/℉/K conversion

⚖️

Weight Converter

kg/g/lb/oz conversion

📐

Area Converter

m²/ft²/acre conversion

🔢

Age Calculator

Calculate exact age in years, months, days, with birthday countdown.

🔢

China Income Tax Calculator

2026 China salary IIT calculator.

🔢

Date Duration Calculator

Days between dates with precise breakdown.

🔢

Discount Calculator

Calculate sale price, savings and markup.

🔢

Pregnancy Due Date

Pregnancy due date and milestones.

🔢

Equation Solver

Solve linear and quadratic equations with steps.

🔢

Fraction Calculator

Add, subtract, multiply, divide fractions.

🔢

GCD & LCM Calculator

Greatest common divisor and least common multiple.

🔢

Loan Amortization

Monthly amortization schedule.

🔢

Chinese Lunar Calendar

Solar / lunar date conversion.

🔢

Percentage Calculator

Multi-mode percentage calculator: what is X% of Y, increase, decrease.

🔢

Interactive Periodic Table

118 chemical elements with details.

🔢

Prime Number Checker

Test primality and factorize.

🔢

Statistics Calculator

Mean, median, mode, std dev, quartiles.

🔢

TDEE Calculator

BMR + daily calories + macros.

🔢

Tip Calculator

Calculate tip and split restaurant bills between people.

🔢

Triangle Calculator

Sides, angles, area calculator.

🔢

Volume Unit Converter

Convert liters, milliliters, cubic meters, gallons, pints and more.

🔢

Speed Unit Converter

Convert meters per second, kilometers per hour, miles per hour and knots.

🔢

Pressure Unit Converter

Convert Pa, kPa, bar, psi, atm, mmHg and more.

🔢

Energy Unit Converter

Convert joules, kilojoules, calories, kilocalories, Wh and kWh.

🔢

Power Unit Converter

Convert watts, kilowatts, horsepower and BTU/h.

🔢

Angle Unit Converter

Convert degrees, radians, gradians, turns, arcminutes and arcseconds.

🔢

Time Unit Converter

Convert seconds, minutes, hours, days, weeks, months and years.

🔢

VAT Calculator

Convert between net price, gross price and tax amount by VAT rate.

🔢

Margin & Markup Calculator

Calculate gross profit, margin and markup from cost and price.

🔢

Ad Metrics Calculator

Calculate CPM, CPC, CPA, CTR and CVR from spend, impressions, clicks and conversions.

🔢

ROI Calculator

Calculate ROI, net profit and return multiple from cost and revenue.

🔢

Break-even Calculator

Calculate break-even units from fixed cost, price and variable cost.

🔢

Running Pace Calculator

Calculate pace, speed and total seconds from distance and finish time.

🔢

Fuel Cost Calculator

Estimate fuel usage and total cost from distance, consumption and fuel price.

🔢

Rent Split Calculator

Split rent, utilities and other shared costs by person or weight.

🔢

Subscription Proration Calculator

Calculate used value, remaining credit and refund reference by billing days used.

🔢

Weighted Grade Calculator

Calculate weighted grades from score/weight rows.

🔢

GPA Calculator

Calculate weighted GPA from courses, grade points and credits.

🔢

Sample Size Calculator

Estimate survey sample size from confidence level, margin of error and population proportion.

🔢

Conversion Rate Calculator

Calculate CTR, CVR and funnel drop-off from visitors, clicks and conversions.

🔢

A/B Test Significance Calculator

Estimate whether two conversion rates differ significantly using a two-proportion z-test.

🔢

Depreciation Calculator

Estimate yearly depreciation and ending book value using straight-line depreciation.

🔢

Inventory Turnover Calculator

Calculate inventory turnover and days inventory from COGS and average inventory.

🔢

Payback Period Calculator

Estimate investment payback period from initial cost and periodic cash flows.

🔢

Salary to Hourly Converter

Convert annual salary into monthly, weekly and hourly pay by work hours and weeks.

🔢

Savings Goal Calculator

Estimate time to reach a savings goal from current balance, monthly saving and annual return.

🔢

Emergency Fund Calculator

Calculate an emergency fund target from monthly expenses and coverage months.

🔢

APR / APY Converter

Convert between APR and APY by compounding frequency.

🔢

Churn Rate Calculator

Calculate customer churn, new customer growth and net growth rate.

🔢

NPS Calculator

Calculate Net Promoter Score from promoter, passive and detractor counts.

🔢

Customer LTV Calculator

Estimate customer lifetime value from ARPU, gross margin and monthly churn.

🔢

CAC Payback Calculator

Calculate CAC payback months from acquisition cost, monthly revenue and gross margin.

🔢

RICE Score Calculator

Calculate product prioritization score from Reach, Impact, Confidence and Effort.

🔢

ICE Score Calculator

Calculate ICE prioritization score from Impact, Confidence and Ease.

🔢

Weighted Score Matrix

Calculate weighted totals for options from option|criterion|score|weight rows.

🔢

Burn Rate / Runway Calculator

Estimate net burn rate and runway from cash, monthly revenue and monthly expenses.

🔢

CAGR Calculator

Calculate compound annual growth rate from beginning value, ending value and years.

🔢

Rule of 72 Calculator

Estimate doubling time from return rate, or required return from target years.

🔢

Weighted Average Calculator

Calculate weighted average and total weight from value|weight rows.

🔢

Overtime Pay Calculator

Calculate total pay from hourly rate, regular hours, overtime hours and multiplier.

🔢

Commission Calculator

Calculate commission and total income from sales amount, commission rate and base pay.

🔢

Sales Tax Calculator

Calculate tax and total from pre-tax amount and rate, or reverse from total.

🔢

Break-even ROAS Calculator

Calculate break-even ROAS and target revenue from gross margin.

🔢

Profit / Loss Calculator

Calculate profit, margin and cost ratio from revenue, cost and expenses.

🔢

Calorie Deficit Calculator

Estimate weekly weight change from daily calorie deficit.

🔢

Water Intake Calculator

Estimate daily water intake from body weight and exercise minutes.

🔢

One Rep Max Calculator

Estimate one-rep max from weight and reps using the Epley formula.

🔢

Body Fat Navy Calculator

Estimate body fat percentage by sex, height, waist, neck and hip using the Navy formula.

🔢

Inflation Adjustment Calculator

Adjust amount purchasing power by total or annual inflation rate.

🔢

Price Per Unit Calculator

Calculate unit price from price and quantity and compare options.

🔢

Rent Increase Calculator

Calculate rent increase amount, percentage and annual difference.

🔢

Refinance Break-even Calculator

Calculate break-even months from monthly savings and one-time costs.

🔢

Shipping Cost Splitter

Allocate total shipping cost across items by order value share.

🔢

Markup / Margin Calculator

Convert between cost, price, markup and margin.

🔐

Password Generator

Secure random passwords

🎲

Random String

Custom charset batch generate

🔢

Random Number

Custom range random numbers

📱

QR Code Generator

Text/URL to QR code

📷

QR Code Scanner

Image upload / camera scan

⏳

Countdown Timer

Target time countdown

⏱️

Online Stopwatch

Precise timing & laps

🔗

MAC Address Generator

Random MAC address batch gen

🖼️

Favicon Generator

Generate icons from text/emoji

📈

Mermaid Editor

Flowchart/sequence/gantt

📊

Chart Generator

Bar/line/pie chart maker

📸

Markdown to Image

Render Markdown as PNG

📄

PDF Viewer

View PDF files online

📄

Image to PDF

Merge images into PDF

🖼️

PDF to Image

Convert PDF pages to PNG/JPG

🔧

Credit Card Validator

Luhn algorithm credit card validator with brand detection.

🔧

Chinese ID Card Validator

Validate Chinese 18-digit resident ID numbers.

🔧

Email Validator

Email format + MX record validation.

🔧

GitHub Badge Generator

Build shields.io-style README badges visually.

🔧

IBAN Validator

Validate international bank account numbers.

🔧

ISBN Validator

Validate ISBN-10 and ISBN-13 book numbers.

🔧

Phone Number Validator

International phone format parser and validator.

🔧

🍅 Pomodoro Timer

25/5 focus timer for deep work.

🔧

Wheel of Names

Spin the wheel to randomly pick a name.

🔧

ICS Calendar Generator

Generate .ics event files for calendar apps.

🔧

EAN-13 Barcode Generator

Generate EAN-13 SVG barcodes from 12 or 13 digits.

🔧

vCard Generator

Generate .vcf contact cards that can be imported into address books.

🔧

SKU Generator

Generate SKU codes in bulk from prefix, category and sequence number.

🔧

Coupon Code Generator

Generate readable random coupon codes with prefix and length.

🔧

Invoice/Order Number Generator

Generate invoice or order numbers from date, prefix and sequence.

🔧

Changelog Generator

Group Conventional Commit lines into Added, Fixed and Changed changelog sections.

🔧

License Header Generator

Generate source file copyright headers for JS/CSS/Python/HTML styles.

🔧

Conventional Commit Generator

Generate conventional commit messages from type, scope, subject and body.

🔍

Meta Tags Generator

Generate SEO meta tags including title, description, keywords, canonical and robots.

🔍

SERP Preview

Preview Google search result title, URL and description length.

🔍

Schema Markup Generator

Generate Schema.org JSON-LD for Article, FAQ, Product and Organization pages.

🔍

OpenGraph Tag Generator

Generate og:title, og:description, og:image and related social sharing tags.

🔍

Twitter Card Generator

Generate X/Twitter card meta tags for social previews.

🔍

Hreflang Generator

Generate alternate hreflang tags for multilingual pages.

🔍

Canonical Checker

Compare current URL and canonical URL, generate canonical tag and flag risks.

🔍

robots.txt Generator

Generate robots.txt rules with User-agent, Allow, Disallow, Sitemap and Crawl-delay.

🔍

LLMs.txt Generator

Generate llms.txt content for AI crawlers and language models.

🔍

Keyword Density Analyzer

Analyze keyword frequency, density and top terms in text.

🔍

Heading Structure Checker

Check H1-H6 heading hierarchy, counts and skipped heading levels.

🔍

Redirect Chain Checker

Analyze pasted redirect chains for hop count, loops and 4xx/5xx statuses.

🔍

UTM Builder

Generate marketing tracking URLs with utm_source, utm_medium and utm_campaign.

🔍

Sitemap.xml Generator

Generate standard XML sitemaps from URL lists with lastmod, changefreq and priority.

🔍

TXT Sitemap Generator

Clean URL lists and generate plain text sitemaps.

🔍

Favicon Tag Checker

Check favicon, apple-touch-icon, manifest and related icon tags in HTML.

🔍

Title/Description Length Checker

Check SEO title and description length with recommended range hints.

🔍

Robots Meta Generator

Generate robots meta tags and X-Robots-Tag header rules.

🔍

Sitemap Index Generator

Generate sitemapindex XML files from multiple sitemap URLs.

🔍

FAQ Schema Generator

Generate FAQPage JSON-LD structured data from question-answer lists.

🔍

Breadcrumb Schema Generator

Generate BreadcrumbList JSON-LD from breadcrumb names and URLs.

🔍

Bulk UTM Link Builder

Append utm_source, utm_medium and utm_campaign parameters to many URLs.

🔍

Keyword Combiner

Combine keyword groups into Cartesian long-tail phrases for ads and SEO.

🔍

Keyword Cluster Organizer

Group keyword lists by first term or similar stem for content planning.

🔍

Bulk Canonical Tag Generator

Generate canonical link tags for a list of URLs.

🔍

Hreflang Matrix Generator

Generate mutual hreflang tag matrices from page-language URL rows.

🔍

Image Alt Audit

Check HTML img tags for missing, short or duplicated alt text.

🔍

Meta Tag Audit

Audit HTML head for title, description, canonical, OG and Twitter Card basics.

🔍

Redirect Map Generator

Convert old,new URL rows into Nginx, Apache or CSV redirect maps.

🔍

Robots.txt Rules Summary

Parse robots.txt and summarize Allow, Disallow and Sitemap by user-agent.

🔍

security.txt Generator

Generate /.well-known/security.txt content with contact, policy, acknowledgments and expiry.

🔍

ads.txt Generator

Generate ads.txt records from ad platform, publisher ID, relationship and certification ID.

🔍

OpenSearch XML Generator

Generate an OpenSearch description file for browser-recognized site search.

🔍

RSS Feed Generator

Generate RSS 2.0 XML from channel information and item rows.

🔍

JSON Feed Generator

Generate JSON Feed v1.1 from site information and item rows.

🔍

Sitemap Lastmod Audit

Extract loc and lastmod from sitemap.xml and flag missing or stale URLs.

🔍

Sitemap URL Extractor

Extract loc URLs from sitemap.xml and output one per line.

🔍

Hreflang Bulk Validator

Check hreflang tags for zh-CN, en and x-default and list href values.

🔍

Meta Description Bulk Audit

Audit URL|description rows for empty, short and long meta descriptions.

🔍

Keyword Gap Table

Compare your keyword list with competitor keywords and output common, missing and unique terms.

🔍

Anchor Text Extractor

Extract link href, anchor text and rel attributes from HTML.

🔍

UTM Parameter Stripper

Remove utm_*, fbclid, gclid and other tracking parameters from URL lists.

🔍

Breadcrumb HTML Generator

Generate accessible nav breadcrumb HTML from label|url rows.

🔍

Title Tag Bulk Audit

Audit URL|title rows for title length, empty values and duplicate titles.

🔍

Sitemap Split Planner

Plan sitemap shard counts from URL count and max URLs per sitemap.

🔍

Link rel Attribute Audit

Check external links in HTML for missing noopener, nofollow or sponsored rel values.

🔍

Noindex Tag Checker

Check HTML robots meta and X-Robots-Tag text for noindex directives.

🔍

robots.txt Merger

Merge robots.txt blocks, deduplicate rules and keep User-agent groups.

🔍

HTML Heading Outline

Extract h1-h6 tags from HTML and generate a page heading outline.

🌍

IP Address Lookup

Query IP location info

🌐

User-Agent Parser

Browser/OS info parsing

🔗

Batch Open URLs

Open multiple tabs at once

🌐

China Mobile Carrier Lookup

11-digit Chinese mobile carrier identifier.

🌐

DNS Lookup

Query DNS records via DNS-over-HTTPS.

🌐

GPS Coordinate Converter

DMS ↔ Decimal degrees converter.

🌐

HTTP Headers Analyzer

Parse HTTP response headers with explanations.

🌐

robots.txt Tester

Test if a URL is allowed or disallowed by robots.txt.

🌐

Sitemap.xml Validator

Validate XML sitemap syntax and protocol compliance.

🌐

Time Zone Converter

Compare time across multiple cities and zones simultaneously. Plan international meetings...

🌐

IP Subnet Calculator

Calculate CIDR ranges, IP ranges and subnet details.

🌐

CIDR Overlap Checker

Check whether two IPv4 CIDR ranges overlap and show start/end IPs.

🌐

DNS Zone Record Generator

Generate common A, CNAME, MX and TXT DNS zone records.

🌐

IPv6 Compress/Expand

Compress or expand IPv6 addresses for network config and log review.

🌐

Port Range Expander

Expand port ranges like 80,443,8000-8010 into explicit port lists.

🌐

IPv4 Range to CIDR

Convert IPv4 start/end ranges into the smallest CIDR block list.

🌐

DNS Zone Record Parser

Parse common DNS zone text into record type, name and value fields.

🌐

Hosts File Generator

Generate hosts file snippets from domain and IP rows.

🌐

IPv4 Wildcard Mask Calculator

Convert between subnet masks and Cisco wildcard masks.

🌐

CIDR Subnet Splitter

Split an IPv4 CIDR block into smaller subnet prefixes.

🌐

Reverse DNS PTR Generator

Generate in-addr.arpa PTR zone records for IPv4 addresses.

🌐

CIDR Host Count

Calculate network address, broadcast address, usable hosts and address range for IPv4 CIDR.

🌐

Port List Deduper

Clean ports and port ranges by deduplicating, sorting and compressing consecutive ranges.

🌐

Host:Port Extractor

Extract host, port and protocol from URLs, host:port values or log text.

🌐

IPv4 List Deduper

Extract IPv4 addresses from text, deduplicate them and sort numerically.

🌐

SPF Record Generator

Generate SPF TXT records from include domains, IPv4, IPv6 and policy.

🌐

DMARC Record Generator

Generate DMARC TXT records with policy, report email and percentage.

🌐

DNS Record Sorter

Sort DNS zone records by type and host name for easier review.

🌐

CIDR Range Table

Convert CIDR blocks into start IP, end IP, total addresses and usable host counts.

🌐

Firewall Rule Generator

Generate iptables or ufw rules from direction, protocol, port, source and action.

🌐

Nginx Upstream Generator

Generate Nginx upstream configuration from name and server list.

🌐

DNS TXT Record Splitter

Split long TXT values into 255-character chunks for DKIM/SPF records.

🌐

IP:Port Combo Generator

Combine IP lists and port lists into host:port rows.

🌐

SSH Config Entry Generator

Generate SSH config entries from Host, HostName, User, Port and IdentityFile.

🌐

Nginx Location Generator

Generate Nginx location blocks from path, proxy target and cache options.

🌐

Domain List Cleaner

Extract domains from text, lowercase, deduplicate and remove protocol/path.

👨‍💻

Developer Community

GitHub/StackOverflow etc.

🌈

Color Tools Nav

Coolors/Adobe Color etc.

🖼️

Image Resources

Unsplash/Pexels etc.

🤖

AI Tools Nav

ChatGPT/Claude/DeepSeek

🎨

Design Tools Nav

Figma/Canva/Photopea

💻

Online IDE Nav

CodePen/CodeSandbox etc.

🇨🇳

Top China Sites

China's leading websites directory

👥

Developer Community

Tech communities & resources