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379+ free, client-side dev tools. Search or filter by category.
Text (28)
Text Counter
Count words, characters, and lines instantly.
Editor.js — Block-Style WYSIWYG Editor
Write rich, structured content with a block-style editor and get clean JSON output, entirely in your browser.
Quill — Rich Text WYSIWYG Editor
Write and format rich text with a full WYSIWYG toolbar: headings, lists, colors, links, images, and more, entirely in your browser.
Tiptap — Headless Rich Text Editor
A rich-text WYSIWYG editor built on ProseMirror, with a full formatting toolbar for headings, lists, code blocks, and more, entirely in your browser.
Milkdown — WYSIWYG Markdown Editor
Write and edit Markdown in a live WYSIWYG editor with tables, task lists, code blocks, and slash commands, entirely in your browser.
Diff Checker
Compare two texts and highlight differences.
Case Converter
Convert text case (snake, camel, kebab, etc.).
Slug Generator
Convert text into a clean URL slug.
Whitespace Cleaner
Trim, collapse whitespace, and remove empty lines.
Line Sorter
Sort lines, unique lines, and cleanup.
Text Reverser
Reverse text, words, or lines.
Find & Replace
Bulk find and replace text (optional regex).
Word Frequency Counter
Count word occurrences and sort by frequency.
Remove Duplicate Lines
Remove duplicate lines (preserve first occurrence).
Line Joiner/Splitter
Join lines with a delimiter or split text into lines.
Line Numberer
Add line numbers to text (with options for start/format).
Lorem Ipsum Generator
Generate placeholder text paragraphs quickly.
Indentation Converter
Convert indentation (tabs/spaces) and normalize widths.
ASCII Art Generator
Convert text to ASCII art using multiple font styles.
Diacritics Remover
Remove accents/diacritics from text.
Emoji Remover
Remove emoji characters from text.
Word Scrambler
Scramble letters in words while keeping first and last letters intact for readability tests.
Text to NATO Alphabet
Convert text to NATO phonetic alphabet equivalents.
Text Diff & Merger
Three-way text merge with color-coded conflict highlighting.
Reading Time Estimator
Estimate reading time for text with configurable WPM speed.
SSML Builder
Visual builder for Speech Synthesis Markup Language with breaks, emphasis, and prosody.
Writing Statistics
Compute Flesch Reading Ease, Gunning Fog, word count, and vocabulary richness.
Invisible Character Detector
Detect 50+ types of invisible Unicode characters with position and name.
JSON (12)
JSON Formatter & Validator
Format, validate, and prettify JSON in your browser. Fast and free.
JSON Minifier
Minify JSON by removing whitespace.
JSON Sort Keys
Recursively sort JSON object keys for stable diffs.
JSONL Viewer
View/validate JSON Lines (NDJSON) and inspect records.
JSON Path Tester
Extract a value using a simple dot/bracket path.
JSON Tree Viewer
Visualize JSON as an interactive collapsible tree with color-coded types.
JSON Crack — Interactive JSON Graph Visualizer
Visualize JSON, YAML, XML, and CSV as an interactive, explorable node graph.
JSON Diff
Compare two JSON objects and show color-coded differences with paths.
JSON String Escape
Escape text so it can be safely embedded as a JSON string.
JSON Schema Validator
Validate JSON data against a JSON Schema.
JSON Data Generator
Generate random JSON data from a template with configurable fields and record count.
JSON Flatten / Unflatten
Flatten nested JSON to dot-notation keys and unflatten back.
Encoding (21)
Text to Binary
Convert text to binary representation (8-bit per character) and back.
Base64 Encoder/Decoder
Encode and decode Base64 strings quickly.
Base32 Encoder/Decoder
Encode and decode Base32 (RFC 4648) locally in your browser.
Base58 Encoder/Decoder
Encode and decode Base58 locally in your browser.
Base85 (Ascii85) Encoder/Decoder
Encode and decode Base85 (Ascii85) text locally in your browser.
Base62 Encoder/Decoder
Encode and decode Base62 text locally in your browser.
URL Encoder/Decoder
Encode/decode URL components safely.
HTML Entities Encoder/Decoder
Encode/decode HTML entities in-browser.
HTML Escape/Unescape
Escape/unescape HTML special characters locally in your browser.
Unicode Escape/Unescape
Escape/unescape Unicode sequences like \uXXXX.
Hex Encoder/Decoder
Encode/decode text to/from hex (UTF-8).
Binary Encoder/Decoder
Encode/decode UTF-8 text to/from binary.
ROT13
Apply ROT13 transform to text.
Quoted-Printable Encoder/Decoder
Encode and decode Quoted-Printable (RFC 2045) text locally in your browser.
Punycode Converter
Convert internationalized domain names to and from Punycode (RFC 3492) in your browser.
Data URL ↔ File
Convert text/files to Data URLs and decode them.
Morse Code Translator
Encode and decode Morse code with audio playback.
Braille Translator
Convert text to and from Braille Unicode characters.
Unicode Normalizer
Normalize text (NFC/NFD/NFKC/NFKD).
Unicode Codepoints
Inspect Unicode codepoints for text and characters.
Unicode Codepoint Lookup
Look up Unicode codepoints, character names, and properties.
Crypto (34)
Password Generator
Generate strong passwords locally in your browser.
Passphrase Generator
Generate secure passphrases from a word list with entropy calculation, locally in your browser.
Password Strength Checker
Estimate password strength locally; no network requests.
Entropy Calculator
Calculate password and passphrase entropy in bits with time-to-crack estimates.
Hash Generator
Generate MD5/SHA256/SHA512 hashes in-browser.
HMAC Generator
Generate HMAC (SHA-256/512) using WebCrypto.
PBKDF2 Generator
Derive keys with PBKDF2 (WebCrypto).
Bcrypt Hash Generator
Hash and verify passwords with bcrypt locally in your browser.
File Hash (SHA-256)
Hash a file locally in your browser.
Checksum Verifier
Verify file checksums (MD5/SHA-1/SHA-256/SHA-512) by computing and comparing hashes in your browser.
Adler-32 Checksum
Compute Adler-32 checksums of text locally in your browser.
CRC-32 Checksum
Compute CRC-32 checksums of text locally in your browser.
AES-GCM Encrypt/Decrypt
Encrypt and decrypt text with AES-GCM using a password, entirely in your browser via WebCrypto.
RSA Key Generator
Generate RSA key pairs (2048/4096-bit) and export as PEM using WebCrypto in your browser.
Random Bytes Generator
Generate secure random bytes (hex/base64).
Random String Generator
Generate random strings with configurable length, character sets, and options.
TOTP Generator
Generate TOTP codes from a Base32 secret with live countdown.
JWT Decoder
Decode JWT header and payload locally.
JWT Builder
Build and sign JWT tokens with HS256 using WebCrypto, entirely in your browser.
CSR Decoder
Decode PEM-encoded Certificate Signing Requests locally in your browser.
Certificate Decoder
Decode PEM X.509 certificates and inspect subject, issuer, validity, and more.
SSH Key Parser
Parse SSH public keys and extract key type, size, and fingerprints.
SRI Hash Generator
Generate Subresource Integrity hashes using SHA-256, SHA-384, and SHA-512.
Text Hash Compare
Hash two texts with SHA-256 and compare to check if they are identical.
JWT Expiry Checker
Check JWT token expiration and decode payload without verification.
Diffie-Hellman Key Exchange
Interactive demonstration of the Diffie-Hellman key exchange protocol.
Hash Identifier
Identify hash types by analyzing length, character set, and common patterns.
Password Policy Tester
Test passwords against configurable security policies with strength scoring.
OTP Generator
Generate TOTP and HOTP one-time passwords compatible with authenticator apps.
PGP Key Info
Parse PGP/GPG public keys and display key ID, fingerprint, and metadata.
Scrypt Hash Generator
Generate scrypt password hashes with configurable N, r, p parameters.
Shamir's Secret Sharing
Split and reconstruct secrets using Shamir's Secret Sharing scheme.
XOR Encrypt/Decrypt
Encrypt and decrypt text using XOR cipher with a repeating key.
Certificate Chain Checker
Parse X.509 certificate chains in PEM format and display subject, issuer, and validity.
CSS (23)
CSS Gradient Generator
Build beautiful CSS gradients visually with a live preview.
Box Shadow Generator
Create CSS box-shadow values visually with multiple shadows and live preview.
Border Radius Generator
Visual CSS border-radius editor with per-corner control.
Flexbox Playground
Interactive CSS flexbox layout builder with live preview.
CSS Grid Generator
Visual CSS Grid layout generator with cell spanning.
CSS Animation Generator
Build CSS @keyframes animations visually with live preview.
Text Shadow Generator
Create CSS text-shadow effects visually with live preview.
CSS Filter Generator
Visual CSS filter effects builder with sliders for all filter functions.
CSS Clip-Path Generator
Visual clip-path builder with shape presets and polygon editor.
Font Stack Preview
Preview font-family stacks and detect system font availability.
CSS Minifier (basic)
Minify CSS quickly in your browser.
CSS Unit Converter
Convert between CSS units: px, rem, em, %, vw, vh, pt, cm, mm, in.
Tailwind to CSS Converter
Convert Tailwind CSS classes to vanilla CSS with property explanations and media query support.
Tailwind Color Palette
Browse all Tailwind CSS color families with HEX/RGB/HSL values and click-to-copy.
CSS Triangle Generator
Generate CSS triangles via the border trick with direction, size, and color controls.
Glassmorphism Generator
Create frosted glass CSS effects with blur, opacity, and gradient controls.
Neumorphism Generator
Generate soft-UI neumorphic shadows with flat, concave, convex, and pressed modes.
CSS Columns Generator
Generate multi-column CSS layouts with gap, rule style, and width controls.
SVG Wave Generator
Generate customizable SVG wave dividers with amplitude, frequency, and layers.
Blob Shape Generator
Generate organic blob shapes using cubic bezier curves with SVG and CSS output.
CSS Pattern Generator
Generate repeating CSS background patterns: dots, stripes, checkerboard, and more.
CSS Aspect Ratio Box
Generate CSS for responsive aspect-ratio containers with modern and fallback output.
Custom Scrollbar Styler
Generate CSS for custom styled scrollbars with track color, thumb color, and width.
Image (37)
Text to Image
Render text as a PNG image with customizable font, size, colors, and style.
Image Compressor
Compress images client-side (JPEG/WebP/PNG).
Image Cropper
Crop images visually with aspect ratio presets in your browser.
Image Resizer
Resize images by pixel dimensions or percentage locally.
Image Flip & Mirror
Flip, mirror, and rotate images locally in your browser.
Image Grayscale & Sepia
Convert images to grayscale or sepia tone locally in your browser.
Image Blur
Apply blur effect to images with adjustable radius in your browser.
Image Watermark
Add text watermarks to images with configurable position, opacity, and rotation.
Image Color Palette Extractor
Extract dominant colors from an image using canvas pixel sampling.
Image EXIF Viewer
Read and display EXIF metadata from JPEG images locally.
Image to Base64 Converter
Convert images to base64 data URIs in your browser.
SVG Optimizer
Optimize SVG by removing comments, metadata, and whitespace.
SVG to CSS Background
Convert SVG to CSS background-image or mask-image using data URI encoding.
Favicon Generator
Generate favicons from text or uploaded image. Download multiple sizes.
Placeholder Image Generator
Generate placeholder image SVGs with custom dimensions, colors, and text.
JS Paint — Classic Paint Editor
Draw, edit, and export images with a free, open-source recreation of classic Paint.
Excalidraw — Virtual Whiteboard
Sketch diagrams, wireframes, and hand-drawn-style illustrations on a virtual whiteboard, entirely in your browser.
Wick Editor — Animation & Game Creator
Create animations, interactive projects, and simple games with a free, open-source Flash-successor editor.
miniPaint — Online Image Editor
Edit photos and images with layers, filters, and drawing tools, entirely in your browser.
Piskel — Pixel Art & Sprite Editor
Draw pixel art and sprite animations, and export as PNG or animated GIF.
SVG-Edit — Vector Graphics Editor
Create and edit SVG vector graphics with shapes, paths, and text, in your browser.
Glyphr Studio — Free Font Editor
Design and edit typefaces, draw glyphs, and export a working font, entirely in your browser.
Icônes — Icon Explorer & Browser
Search 200,000+ open-source icons across 170+ sets with instant fuzzy search, then copy or download each as SVG, JSX, Vue, and more.
Filerobot Image Editor — Crop, Resize & Annotate Images
Crop, resize, rotate, fine-tune, filter, annotate, and watermark images, entirely in your browser.
QR Code Generator
Generate QR codes and download PNG/SVG.
QR Content Parser
Parse QR code content strings and detect URLs, vCards, WiFi, email, phone, SMS, and geo.
Image Noise Generator
Generate Perlin noise, simplex noise, or random noise images with configurable resolution and color.
Image Pixelator
Pixelate images with configurable block size using canvas. Upload and download.
Image Rotate
Rotate images by arbitrary degrees with background color fill. Runs in your browser.
Image Brightness & Contrast
Adjust image brightness and contrast with sliders and live preview using Canvas.
Image Border
Add colored borders and rounded corners to images. Preview and download.
Image Metadata Stripper
Remove EXIF and other metadata from images by re-encoding via Canvas.
App Icon Preview
Preview icons at common app sizes (16x16, 32x32, 48x48, 64x64, 128x128, 256x256, 512x512).
Image Compare Slider
Upload two images and compare them with a draggable before/after slider.
Image Editor
Free browser-based Photoshop-like editor with layers, brushes, shapes, text, filters, and export.
Pixel Ruler
On-screen pixel measurement tool with draggable ruler and crosshair coordinates.
Lorem Pixel — Placeholder Images
Generate placeholder images with custom size, color, text, and patterns.
PDF (7)
PDF Merge
Merge multiple PDF files into one (client-side).
PDF Editor — Add Text, Images & Signatures
Open a PDF and add text, images, and hand-drawn signatures on the page, then save the edited file — entirely in your browser.
pdfme — PDF Template Designer
Design PDF templates visually — place text, images, tables, barcodes, and QR codes on a base PDF and generate a finished document, entirely in your browser.
PDF Split
Split a PDF into multiple PDF files (client-side).
PDF Rotate Pages
Rotate selected pages in a PDF (client-side).
PDF Remove Pages
Remove pages from a PDF (client-side).
PDF Extract Pages
Extract selected pages into a new PDF (client-side).
Network (25)
DNS Lookup
Lookup DNS records for a domain.
SSL Certificate Checker
Check certificate details for a domain.
Subnet Calculator
Calculate subnets, masks, and ranges.
CIDR → IP Range
Convert an IPv4 CIDR to start/end range and count.
IPv4 Converter
Convert IPv4 between dotted form, integer, hex, and binary.
IPv4 ↔ Integer
Convert IPv4 addresses to/from 32-bit integers.
IP Info & Geolocation
See your public IP address and geolocation info.
CORS Tester
Test CORS headers for any URL from the browser.
HTTP Method Tester
Send HTTP requests to any URL and inspect the response.
HTTP Status Codes
Lookup HTTP status codes and meanings.
HTTP Headers → JSON
Convert raw HTTP headers into a JSON object.
Webhook Inspector
Inspect and debug webhook payloads by parsing raw HTTP requests.
WebSocket Tester
Connect to WebSocket servers, send and receive messages.
HAR Viewer
Upload and visualize HTTP Archive (HAR) files with waterfall charts.
User-Agent Parser
Parse user-agent strings and extract browser/OS/device info.
MAC Address Generator
Generate random MAC addresses (with options for format).
Common Port Numbers Reference
Searchable reference table of common TCP/UDP port numbers and services.
JSON Placeholder Client
Interactive REST client for the JSONPlaceholder API with GET, POST, PUT, DELETE.
HTTP Header Analyzer
Parse and explain HTTP request/response headers with security recommendations.
GraphQL Query Builder
Visual builder for GraphQL queries with variables, fields, and aliases.
Cookie Parser
Parse Set-Cookie headers and show name, value, domain, path, flags, and expiry.
CSP Evaluator
Evaluate Content-Security-Policy headers for misconfigurations and security risks.
URL Component Inspector
Deep-inspect URL components: protocol, host, port, path, query params, and fragment.
OAuth Debugger
Build and inspect OAuth 2.0 authorization URLs with scope and state parameters.
CVE Reference Lookup
Search a curated database of notable CVEs by ID, keyword, or severity.
Converter (36)
JSON → CSV
Convert JSON arrays to CSV locally.
CSV → JSON
Convert CSV to JSON locally in your browser.
JSON to YAML Converter
Convert JSON to YAML with configurable indentation.
YAML to JSON Converter
Convert YAML to JSON and JSON to YAML locally in your browser.
JSON to XML Converter
Convert JSON objects to well-formed XML with indentation and attribute mapping options.
URL Parser
Parse a URL into its components and query params.
URL Normalizer
Normalize URLs (trim, lowercase host, remove default ports, etc.).
Querystring ↔ JSON
Convert querystrings to JSON and back.
UTM Builder
Build URLs with UTM parameters (source, medium, campaign, etc.).
Base Converter
Convert between binary, decimal, and hex.
Number Base Converter
Convert numbers between any bases (2-64) with step-by-step explanations.
TSV ↔ CSV
Convert TSV to CSV and CSV to TSV.
CSV Delimiter Detector
Detect likely delimiter for a CSV snippet.
CSV Viewer
Upload or paste CSV data and view as a sortable, filterable table.
XML Formatter
Format and prettify XML locally in your browser.
XML Minifier
Minify XML by removing unnecessary whitespace.
XML to JSON Converter
Convert XML to JSON and JSON to XML locally in your browser.
HTML to JSX Converter
Convert HTML to JSX/React with class, style, and event handler transforms.
HTML to Markdown
Convert HTML to Markdown. Handles headings, links, images, lists, tables, and code.
HTML → Text
Convert HTML into plain text locally in your browser.
Markdown to HTML
Convert Markdown to HTML with live preview. Supports all common Markdown syntax.
Markdown Preview
Preview Markdown locally (safe subset).
cURL to Fetch
Convert cURL commands to JavaScript fetch() code with async/await.
Timestamp Converter
Convert Unix timestamps to dates and back.
Epoch Converter
Convert epoch timestamps (seconds, milliseconds, microseconds) to dates and back.
Roman Numeral Converter
Convert between integers and Roman numerals (1-3999) with live conversion.
Unit Converter
Convert between units of length, weight, temperature, volume, and speed.
Currency Formatter
Format numbers as currency for 50+ locales with live preview.
INI File Editor
Parse and edit INI files with section/key/value table and serialization.
ENV File Parser
Parse .env files and display variables with auto-detected types.
CSV Transpose
Transpose CSV rows and columns with configurable delimiter.
Properties File Editor
Parse and edit Java .properties files with Unicode escapes and inline editing.
MessagePack Viewer
Decode Base64-encoded MessagePack data and view as formatted JSON.
Byte Converter
Convert between B, KB, MB, GB, TB, PB in binary (1024) and decimal (1000) modes.
Number to Words
Convert numbers up to quintillions to English words.
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine with formulas.
Generator (17)
UUID Generator
Generate UUIDv4 locally in your browser.
UUIDv7 Generator
Generate time-ordered UUIDv7 values locally in your browser.
NanoID Generator
Generate NanoID identifiers locally in your browser.
ULID Generator
Generate ULIDs locally in your browser.
Fake Data Generator
Generate fake names, emails, addresses, phone numbers, companies, and dates in your browser.
Table Generator
Generate tables in HTML, Markdown, CSV, TSV, LaTeX, and ASCII formats.
robots.txt Generator
Generate a robots.txt file quickly.
sitemap.xml Generator
Generate a sitemap.xml for a list of URLs.
PWA Manifest Generator
Generate manifest.json for Progressive Web Apps with all required fields.
CSP Header Generator
Generate Content-Security-Policy headers with presets and custom directives.
Sparkline Generator
Generate inline sparkline SVGs from comma-separated numbers.
Bar Chart Generator
Generate bar charts from label/value data and download as PNG.
Pie Chart Generator
Generate pie charts with colored slices, percentages, and legend. Download as PNG.
Markdown Table Generator
Build Markdown tables with a spreadsheet-like editor.
API Key Generator
Generate random API keys in various formats (UUID, hex, base64, custom).
JSON Resume Builder
Build JSON Resume-standard resumes with a form-based editor.
WiFi QR Code Generator
Generate QR codes for WiFi credentials with SSID, password, and encryption.
Math (18)
Scientific Calculator
Perform scientific calculations with trigonometric, logarithmic, and power functions.
Matrix Calculator
Add, subtract, multiply, transpose, and find determinants of matrices.
Statistics Calculator
Calculate mean, median, mode, standard deviation, variance, and percentiles.
Fibonacci Generator
Generate Fibonacci sequences and calculate the Nth Fibonacci number using BigInt.
Prime Number Checker
Check if a number is prime, find primes in a range, and compute prime factorizations.
GCD & LCM Calculator
Calculate the Greatest Common Divisor and Least Common Multiple with step-by-step work.
Binary Calculator
Perform binary arithmetic and bitwise operations (AND, OR, XOR, NOT, shifts).
Aspect Ratio Calculator
Calculate and simplify aspect ratios, find missing dimensions, and scale resolutions.
Percentage Calculator
Calculate percentages (increase/decrease/of value) quickly.
Fraction Calculator
Add, subtract, multiply, and divide fractions with step-by-step simplification.
Quadratic Equation Solver
Solve quadratic equations (ax² + bx + c = 0) with real and complex roots, plus graphing.
Hex Calculator
Hex arithmetic with results in hex, decimal, and binary.
Percentage Change Calculator
Calculate percentage change, difference, ratio, and multiplier between two values.
Standard Deviation Calculator
Compute population and sample standard deviation with step-by-step work.
Significant Figures Counter
Count significant figures with visual highlighting and rounding.
Probability Calculator
Calculate combinations, permutations, binomial probability, and expected value.
Chemical Equation Balancer
Balance chemical equations with formula parsing and coefficient search.
IEEE 754 Float Visualizer
Visualize IEEE 754 float representation with color-coded sign, exponent, and mantissa.
Date & Time (9)
Date Calculator
Add or subtract days, weeks, months, and years to any date.
Timezone Converter
Convert a time from one timezone to another instantly.
Age Calculator
Calculate your exact age in years, months, and days from your birthdate.
Countdown Timer
Set a target date and time to see a live countdown.
Stopwatch
Precise stopwatch with start, stop, reset, and lap functionality.
Date Difference Calculator
Calculate the difference between two dates in days, weeks, months, and years.
ISO Date Converter
Convert ISO 8601 date strings to human-readable format and back.
Weekday Finder
Find the day of the week for any date, plus ISO week number and day-of-year.
Duration Formatter
Convert between duration formats: seconds, HH:MM:SS, and human-readable text.
DevOps (23)
Crontab Generator
Visual crontab expression builder with presets and next run times.
Nginx Config Generator
Generate nginx server block configurations with SSL, gzip, and location blocks.
.htaccess Generator
Generate .htaccess rules for redirects, rewrites, CORS, caching, and error pages.
SSH Config Generator
Generate SSH config entries for ~/.ssh/config with host aliases and keys.
Docker Run Command Generator
Generate docker run commands visually with ports, volumes, and env vars.
Dockerfile Generator
Generate Dockerfiles from language and framework presets for Node.js, Python, Go, Java, and more.
Docker Compose Generator
Generate docker-compose.yml files with services, volumes, and networks.
Systemd Service Generator
Generate systemd service unit files with [Unit], [Service], and [Install] sections.
GitHub Actions Generator
Generate GitHub Actions workflow YAML files from common presets.
ESLint Config Generator
Generate .eslintrc configurations with rule presets for various frameworks.
.env File Generator
Generate .env file templates with typed key-value pairs, comments, and common presets.
.gitignore Generator
Generate .gitignore files for popular languages, frameworks, IDEs, and operating systems.
Open Source License Generator
Generate open source license files (MIT, Apache 2.0, GPL 3.0, BSD, ISC, MPL 2.0, Unlicense).
Kubernetes YAML Generator
Generate Kubernetes Deployment, Service, and Ingress YAML manifests.
Terraform HCL Generator
Generate Terraform HCL for AWS, GCP, and Azure resources.
Makefile Generator
Generate Makefiles with targets, dependencies, and common build patterns.
Procfile Generator
Generate Procfiles for Heroku, Railway, and similar PaaS platforms.
EditorConfig Generator
Generate .editorconfig files with language-specific formatting rules.
Prettier Config Generator
Generate .prettierrc with all formatting options in a visual builder.
TSConfig Generator
Generate tsconfig.json with presets for React, Node, Library, and more.
Dependabot Config Generator
Generate dependabot.yml with package ecosystems and schedules.
Renovate Config Generator
Generate renovate.json with presets, schedule, and automerge rules.
Pre-commit Config Generator
Generate .pre-commit-config.yaml with popular hook repositories.
Color (11)
Color Converter
Convert HEX/RGB/HSL and copy values.
Color Picker
Full color picker with HEX, RGB, HSL, and HSB values.
Color Contrast Checker
Check WCAG contrast ratios for text/background colors.
Color Palette Generator
Generate harmonious color palettes from a base color using color theory.
Color Blindness Simulator
Simulate how colors look with Protanopia, Deuteranopia, Tritanopia, and Achromatopsia.
CSS Color Name Lookup
Search all 148 CSS named colors with hex, RGB values, and color preview swatches.
Hex Color Mixer
Mix two hex colors with adjustable ratio and see the blended result.
Gradient Palette Generator
Generate multi-stop gradient color palettes with HSL interpolation.
Color Palette from Text
Generate a consistent color palette by hashing text strings into colors.
Color Harmonies
Calculate complementary, triadic, split-complementary, analogous, and tetradic color harmonies from a base color.
Color Eyedropper
Pick colors from uploaded images with zoom lens, HEX/RGB/HSL output.
Code (45)
JSON to TypeScript
Generate TypeScript interfaces or types from JSON input.
JSON to Go Struct
Generate Go structs from JSON with proper json tags.
JSON to Python Dataclass
Generate Python dataclass code from JSON with type hints.
JSON to Java POJO
Generate Java POJO classes from JSON with getters, setters, and constructors.
JSON to Rust Struct
Generate Rust structs from JSON with serde derive macros.
JSON to C# Classes
Generate C# classes from JSON with public properties and using statements.
JSON to Zod Schema
Generate Zod validation schemas from JSON objects with proper TypeScript types.
JSON to GraphQL Schema
Generate GraphQL type definitions from a JSON example object.
Regex Tester
Test regex patterns with live matches.
Regex Escape
Escape text so it can be safely used inside a regular expression.
Regex Generator
Generate regular expressions from common patterns like email, URL, IP, and phone.
Regex Visualizer — Visual Regular Expression Editor
Visualize, build, and test regular expressions with a railroad-diagram editor.
Glob Pattern Tester
Test glob patterns against file paths with *, **, ?, [abc], and {a,b} support.
XPath Tester
Test XPath expressions against XML documents and see matching nodes.
Swagger Editor — OpenAPI & AsyncAPI Editor
Design, describe, and document OpenAPI and AsyncAPI specs with real-time validation and a live preview.
Ace Editor Playground — In-Browser Code Editor
Try the Ace code editor live with syntax highlighting for 45+ languages, 24 themes, and every editor setting.
Monaco Editor Playground — VS Code's Code Editor
Try Monaco Editor, the code editor that powers VS Code, with syntax highlighting, IntelliSense, and a live diff view for dozens of languages.
SQL Formatter
Format and beautify SQL queries with syntax highlighting.
GraphQL Formatter
Format and prettify GraphQL queries, mutations, and schema definitions.
HTML Formatter
Format/prettify HTML locally in your browser.
HTML Minifier (basic)
Minify HTML quickly in your browser.
HTML Minifier Pro
Advanced HTML minifier with options for removing comments, optional attributes, whitespace, and empty elements.
JavaScript Minifier (basic)
Minify JavaScript code quickly in your browser.
JavaScript String Escaper
Escape text for JavaScript/TypeScript string literals.
Shell Escape
Escape strings for common shells (bash/zsh) and copy safely.
TOML Formatter & Validator
Format, validate, and prettify TOML documents locally in your browser.
Cron Expression Parser
Parse cron expressions into human-readable schedules with next execution times.
Semver Checker
Validate, compare, and check semantic versions against ranges.
Chmod Calculator
Visual chmod permission calculator with octal and symbolic notation.
Basic Auth Header Generator
Generate a Basic Authorization header from username/password.
MIME Type Lookup
Lookup common MIME types by extension.
HTML Character Codes Reference
Browse and search HTML character entities with names, numbers, Unicode codepoints, and descriptions.
Fetch Code Generator
Generate fetch/axios/curl code from request parameters.
Regex Cheatsheet
Interactive regex reference with searchable patterns, character classes, and examples.
Git Command Builder
Build git commands visually with operation selection, flags, and explanations.
Escape Sequence Reference
Interactive reference for escape sequences across programming languages.
SQL to MongoDB Query
Convert SQL SELECT queries to MongoDB find() syntax.
Python to JavaScript
Convert common Python patterns to JavaScript equivalents.
HTTP Status Code Quiz
Test your knowledge of HTTP status codes with an interactive quiz.
Keyboard Event Viewer
Press any key and see keyCode, key, code, which, and modifier state in real-time.
ASCII Table Reference
Complete 128-character ASCII table with decimal, hex, octal, and binary columns.
Keyboard Shortcut Visualizer
Visualize keyboard shortcuts for VS Code, Vim, and Emacs on an interactive layout.
DrawDB — Database Schema Designer
Design and visualize database schemas with an interactive diagram editor, entirely in your browser.
draw.io — Diagram & Flowchart Editor
Create flowcharts, UML, ER diagrams, network diagrams, and org charts with a full-featured diagram editor, entirely in your browser.
Mermaid Live Editor — FlowChart & Diagram Editor
Write Mermaid markdown-like syntax and see flowcharts, sequence diagrams, ER diagrams, Gantt charts, and more render live.
Validator (8)
Email Address Validator
Validate email addresses per RFC 5322 with detailed breakdown and batch support.
Credit Card Validator
Validate credit card numbers with Luhn algorithm and detect card type.
IBAN Validator
Validate IBAN numbers, verify check digits, and show country and BBAN breakdown.
UUID Validator
Validate UUID strings (v1–v8) and show version/variant.
Phone Number Formatter
Format phone numbers in international and national formats for 10+ countries.
Open Graph Preview
Preview how a page looks when shared on Facebook, Twitter, LinkedIn, and Discord.
robots.txt Tester
Test robots.txt rules against URL paths and user-agents.
YAML Validator
Validate YAML syntax with tab detection, duplicate keys, and auto-fix.
Finance (5)
Compound Interest Calculator
Calculate compound interest with principal, rate, time, and compounding frequency.
Investment Return Calculator
Calculate ROI, CAGR, and future value of investments over time.
Loan Calculator
Calculate monthly payments, total interest, and amortization schedule for loans.
Mortgage Calculator
Calculate mortgage payments with down payment, insurance, and tax estimates.
Tip Calculator
Calculate tip amounts and split bills between people.
Media (7)
Online Audio Converter
Free online audio converter. Convert audio files in your browser using WebAssembly.
Waveform Playlist — Multitrack Web Audio Editor
Arrange, trim, and mix multiple audio tracks on a canvas waveform timeline with per-track mute/solo, volume, pan, zoom, and WAV export.
OpenReel — Browser Video Editor
Edit video on a multi-track timeline in your browser: import clips, add text and effects, and export a finished video.
Omniclip — Free In-Browser Video Editor
Trim, split, and arrange video, images, text, audio, transitions, and filters on a timeline, then export up to 4K — all in your browser.
Online Video Converter
Free online video converter. Convert video & audio files in your browser using WebAssembly.
AudioMass — Online Audio & Waveform Editor
Edit, trim, and apply effects to audio directly in your browser with a free, open-source waveform editor.
mebm — Browser Video Editor
Animate images, video clips, and text overlays with keyframes directly in your browser and export as a video.
Misc (13)
BMI Calculator
Calculate Body Mass Index from height and weight in metric or imperial units.
reveal.js — HTML Presentation Framework
A live, interactive slide deck built with reveal.js, the open-source HTML presentation framework with CSS 3D transforms, transitions, and speaker notes.
three.js Editor — In-Browser 3D Scene Editor
Build, edit, and export 3D WebGL scenes in your browser: geometries, materials, lights, cameras, and scripts.
GrapesJS — Web Page & HTML Builder
Build web pages and HTML templates visually with a drag-and-drop canvas, block manager, and style manager, entirely in your browser.
Univer Spreadsheet — Online Spreadsheet Editor
Edit spreadsheets in your browser: formulas, cell formatting, conditional formatting, data validation, filters, and sorting.
Slidev — Presentation Slides for Developers
A live, interactive Slidev slide deck: Markdown-authored presentation slides with code highlighting, animations, and keyboard navigation.
Pomodoro Timer
Customizable Pomodoro timer with work/break intervals, progress bar, and sound alerts.
Screen Resolution Info
Display screen resolution, viewport size, pixel ratio, orientation, and touch support.
Battery Status
View battery level, charging status, and time remaining via the Battery API.
Clipboard Inspector
Read clipboard content including text, HTML, and images with history.
Speech to Text
Convert speech to text using the Web Speech API with 15 language options.
x-spreadsheet — Browser Spreadsheet Grid
A free, open-source spreadsheet grid with formulas, cell styling, and multiple sheets, running entirely in your browser.
impress.js — CSS3 Presentation Demo
A live, interactive presentation built with impress.js, the open-source library that uses CSS3 3D transforms and transitions for a zooming, rotating slide deck.