Online Developer Tools & Free Web Utilities

Generate random passwords, UUIDs, colors, QR codes, slugs, and more. Essential tools for developers and everyday use.

Minify JavaScript, HTML, CSS, and JSON to reduce file size and improve load times. Keep your code compact and fast.

Format and beautify code in multiple languages. Support for JavaScript, HTML, CSS, JSON, SQL, XML, and more.

Convert between formats: JSON to CSV, YAML to JSON, base64 to image, and many more data transformations.

Create cryptographic hashes: MD5, SHA-1, SHA-256, SHA-512, SHA-3, and RIPEMD-160 for security and integrity.

Encode and decode URL, Base64, Base32, Base58, Base62, HTML entities, and QR codes.

View and inspect content: diff viewer, image color picker, source code viewer, and more.

Parse and analyze URLs, cURL commands, user agents, and color values.

Validate CSS, JSON, CSV, and other formats. Ensure your data is correct before use.

Encrypt and decrypt data using AES, Rabbit, and TripleDES algorithms. Client-side security.

Online URL utilities: follow redirects, URL shortening, and URL-related operations.

YouTube and TikTok utilities, FFmpeg browser tools for audio extraction, trimming, GIF conversion, and compression. For creators and developers.

Token counters, JSON extractors, and utilities for working with AI prompts and LLM outputs. Estimate token usage and parse responses.

Generate CSS for gradients, box shadows, flexbox, backgrounds, and more. Visual editors with live preview. Copy-ready code.

Mathematical calculators: expression evaluator, GCD/LCM, prime checker, factorial, number base converter, quadratic solver, Roman numerals, Fibonacci.

Convert length, weight, temperature, volume, area, speed, data storage, time, pressure, energy, angle, power, frequency, fuel consumption, density, torque, force, flow rate, acceleration, illuminance, and electric units. Meters, kg, Celsius, mph, GB and more. Free online. Client-side.

Meta tag generator, JSON-LD schema, Open Graph, sitemap, robots.txt. SEO helpers for developers and content creators.

SVG minifier, optimizer, and data URI converter. All run in your browser. No server required.

Key code viewer, shortcut formatter. Capture key events and format keyboard shortcuts. Client-side.

View your IP, user agent, screen size, and browser info. Useful for debugging and testing.

Visualize sorting algorithms with animations. Bubble sort, quick sort, merge sort, and more. Learn how algorithms work step by step.

Postal code lookup, validation, and address tools. Find city and state from postal code. Supports 70+ countries.

Free online PDF tools that run entirely in your browser. Merge, split, compress, convert, rotate and edit PDFs. 100% client-side — your files never leave your device.

Free online Excel tools that run entirely in your browser. Convert, view, merge and transform spreadsheets. 100% client-side — your files never leave your device.

Convert Windows paths, line endings (CRLF/LF), sanitize filenames, format .reg files, and brace GUIDs for the registry. All run in your browser — no upload, no server.

chmod octal and symbolic permissions, Unix paths and WSL, sanitize POSIX filenames, format .desktop files, escape bash strings. All run in your browser — no upload, no server.

Format plist XML, convert file URLs to paths, sanitize Finder-friendly names, escape AppleScript strings, validate bundle IDs. All run in your browser — no upload, no server.

Create and extract ZIP archives in your browser. Pack multiple files or a whole folder, or unzip and download contents. 100% client-side — nothing is uploaded.

Free online text utilities: ROT/Caesar variants, line and word transforms, statistics, whitespace cleanup, classic ciphers, regex helpers, and more. Everything runs in your browser — your text never leaves your device.

Unix timestamps, UTC, ISO 8601, durations, countdowns, calendar helpers, and random date/time utilities. All run in your browser — nothing is uploaded.

Count words, characters, and sentences in text. Useful for writers and content creators.

Random wheel picker for fair selection. Spin the wheel to choose randomly.

Calculate the number of days between two dates. Track durations and deadlines.

Generate secure random passwords with custom length and character sets.

Generate random colors in HEX, RGB, HSL formats for design and development.

Generate random text, Lorem Ipsum, and placeholder content.

Minify JavaScript code. Remove whitespace and shorten variable names.

Minify HTML to reduce file size and improve page load speed.

Minify CSS by removing unnecessary whitespace and comments.

Minify JSON by removing whitespace and newlines.

Format and beautify JavaScript code with proper indentation.

Format HTML with consistent indentation and line breaks.

Format CSS for better readability and maintainability.

Format PHP code with proper styling and indentation.

Format Ruby code for consistency and readability.

Format and validate JSON with syntax highlighting.

Convert JSON data to CSV format. Export JSON to spreadsheet-friendly format.

Convert CSV to JSON. Parse comma-separated values into structured data.

Convert JSON to YAML format. Transform data between formats.

Convert text between camelCase, snake_case, kebab-case, and more.

Convert Base64 encoded strings to images. Decode and display images.

Convert images to Base64 encoding. Embed images in HTML or JSON.

Generate MD5 hash from text. Fast cryptographic hash for checksums.

Generate SHA-1 hash from text.

Generate SHA-256 hash. Secure hashing for passwords and integrity.

Generate SHA-512 hash. Strong cryptographic hashing.

Generate SHA-3 (Keccak) hash.

Generate RIPEMD-160 hash.

Decode URL-encoded strings. Convert percent-encoded text to readable form.

Encode text for URLs. Convert special characters to percent-encoding.

Encode text to Base32 format.

Decode Base32 encoded strings.

Encode text or binary to Base64.

Decode Base64 encoded strings.

Compare two texts and view differences. Side-by-side or unified diff view.

Get the dominant or average color from an image.

Extract color palette from images.

Pick colors from images. Get hex, RGB values from any image.

View and inspect webpage source code with syntax highlighting.

View JSON as a collapsible tree. Pretty-print, expand, collapse. Sample data included.

Parse and analyze URL components: protocol, host, path, query, fragment.

Parse cURL commands. Convert cURL to different languages and formats.

Parse and analyze browser user agent strings.

Parse color values: hex, RGB, HSL, and convert between formats.

Decode and inspect JSON Web Tokens. View header, payload, and signature.

Test regular expressions against sample text. See matches in real time.

Validate CSS syntax and find errors.

Validate JSON syntax. Find and fix JSON errors.

Validate CSV format and structure.

Validate email format and check syntax.

Validate URL format and structure.

Validate IPv4 and IPv6 addresses.

Decrypt data encrypted with AES algorithm.

Encrypt data using AES algorithm. Secure client-side encryption.

Decrypt data encrypted with Rabbit algorithm.

Encrypt data using Rabbit stream cipher.

Decrypt TripleDES encrypted data.

Encrypt data using TripleDES algorithm.

Follow URL redirects and get the final destination. Check where a URL points to.

Shorten long URLs. Create compact links.

Parse URL query string to key-value pairs. Extract ?a=1&b=2 as structured data.

Build query string from key-value pairs. Create ?param=value&foo=bar from input.

Normalize URL: lowercase host, sort query params, remove trailing slash. Clean URLs for comparison.

Get domain or hostname from any URL. Extract root domain from full links.

Extract video ID from any YouTube URL. Supports youtube.com, youtu.be, and embedded formats.

Get thumbnail image URLs from YouTube video ID. Multiple resolutions available.

Convert timestamps like 1:30 or 1m30s to seconds and vice versa. For video chapters.

Extract video ID from TikTok URLs. Get the unique ID for sharing or embedding.

Validate TikTok username format. Check if @username is valid before use.

Extract audio from video files in your browser. Save as MP3 or AAC. No upload—processing runs locally with FFmpeg.wasm.

Count characters, words, and estimate tokens for LLM prompts. Useful for OpenAI, Claude, and other AI APIs.

Extract JSON from LLM responses. Parse code blocks and clean malformed JSON from AI output.

Generate Model Context Protocol (MCP) tool definitions. Create name, description, and inputSchema JSON for MCP servers.

Format and validate MCP server configuration (mcp.json). Pretty-print and check structure for Cursor, Claude, and other MCP clients.

Generate llms.txt for your website. Creates AI-readable discovery file with name, summary, contact, and services. Spec 1.1.1 compatible.

Build prompts with {{variable}} placeholders. Fill in values and preview. For reusable AI prompts.

Create CSS linear and radial gradients. Pick colors, set stops, adjust angle. Live preview and copy-ready code.

Generate box-shadow CSS. Adjust offset, blur, spread, color. Multiple shadows. Live preview.

Visual Flexbox playground. Set flex-direction, justify, align. See layout instantly. Copy CSS.

Create CSS backgrounds: solid, gradient, or pattern. Combine colors and gradients. Copy code.

Generate border-radius CSS. Individual corners or shorthand. Pill, circle, custom. Live preview.

Create text-shadow CSS. Offset, blur, color. Multiple shadows for depth. Live preview.

Evaluate mathematical expressions: 2+3*4, sqrt(16), 2^10. Supports basic operations and common functions.

Calculate Greatest Common Divisor and Least Common Multiple of two or more numbers. Euclidean algorithm.

Check if a number is prime. Find prime factors. Useful for cryptography and number theory.

Calculate n! (factorial). Enter a non-negative integer. Used in permutations and combinations.

Convert numbers between binary, decimal, octal, and hexadecimal. For developers and programmers.

Solve ax² + bx + c = 0. Find roots, discriminant. Step-by-step solution for quadratic equations.

Convert between meters, kilometers, miles, feet, inches, centimeters, millimeters, yards. For everyday and engineering use.

Convert between kilograms, grams, pounds, ounces. Metric and imperial weight units.

Convert between Celsius, Fahrenheit, and Kelvin. Weather, cooking, science.

Convert between liters, milliliters, gallons, fluid ounces, cups. For cooking and liquids.

Convert between square meters, square kilometers, acres, square feet, square inches, hectares.

Convert between km/h, m/s, mph, knots. For driving, running, aviation, and maritime.

Generate SEO meta tags: title, description, keywords. Includes character count for Google (title 30-60, description 50-160).

Generate JSON-LD structured data. WebSite, Organization, Article, Product schemas. Copy-ready for Schema.org.

Generate Open Graph and Twitter Card meta tags. og:title, og:description, og:image for social sharing.

Generate XML sitemap from URL list. One URL per line. For search engine submission.

Generate robots.txt. Disallow paths, sitemap URL. Configure crawler rules.

Analyze meta title and description. Character count, word count. SEO recommendations for length.

Convert SVG string to data:image/svg+xml,... format. Embed SVGs in CSS or HTML.

Minify SVG by removing whitespace and comments. Reduce file size. Client-side.

Minify SVG and normalize viewBox. Simple client-side optimization.

Press any key to see key, code, keyCode, and modifier keys. For keyboard event debugging.

Convert keyboard shortcuts between formats: Ctrl+C, ctrl+c, JSON. For docs and configs.

View your public IP, user agent, language, screen size. Rate limited for fair use.

View browser capabilities: user agent, screen, language, connection type, cookies. All client-side, no server.

See what headers your browser sends. Useful for debugging and API development. Shows all incoming request headers.

Fetch a URL and view response status and headers. Check CORS, cache-control, and server headers.

Visualize bubble sort algorithm. Compare adjacent elements and swap if wrong order. O(n²) time complexity.

Visualize selection sort. Find minimum, swap with first unsorted. O(n²) time complexity.

Visualize insertion sort. Build sorted array one element at a time. O(n²) average, good for small data.

Visualize merge sort. Divide and conquer, merge sorted halves. O(n log n) time complexity.

Visualize quick sort. Pick pivot, partition, recurse. O(n log n) average, in-place.

Look up city and state from postal code. Supports 70+ countries. Select country, enter postal code, get location.

Validate postal code format for any country. Check if zip code matches country rules before submission.

Extract text from PDF files directly in your browser. 100% client-side — your files never leave your device. No upload, no server processing.

Convert PDF pages to PNG or JPG images in your browser. 100% client-side — your files never leave your device. No upload required.

Merge multiple PDF files into one document in your browser. 100% client-side — your files never leave your device. No upload, no server.

Split PDF files by page range in your browser. Extract specific pages into a new PDF. 100% client-side — files stay on your device.

Compress PDF file size in your browser. Reduce PDF size without losing quality. 100% client-side — your files never leave your device.

Rotate PDF pages by 90, 180, or 270 degrees in your browser. 100% client-side — your files never leave your device.

Convert Excel spreadsheets (.xlsx, .xls) to JSON format in your browser. 100% client-side — your files never leave your device.

Convert JSON data to Excel (.xlsx) files in your browser. 100% client-side — your data never leaves your device.

Convert Excel files to CSV format in your browser. 100% client-side — your files never leave your device. No upload required.

Convert CSV files to Excel (.xlsx) format in your browser. 100% client-side — your data never leaves your device.

View Excel files online in your browser without Excel installed. 100% client-side — your files never leave your device.

Convert Excel spreadsheets to HTML table code in your browser. 100% client-side — your files never leave your device.

Convert between forward slashes and backslashes, normalize mixed paths, and optionally add long-path \\?\ prefix. UNC paths supported. Runs in your browser.

Convert between LF, CRLF, and CR. See counts for each style. Fix Windows vs Unix line endings. 100% client-side.

Remove or replace invalid Windows filename characters (< > : \" / \ | ? * and control characters). Safe names for scripts and batch files.

Format and prettify .reg files. Handles UTF-16 LE pasted content. Indent values under keys. No upload — text stays in your browser.

Format UUIDs with registry-style braces: {XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX}. Uppercase, one per line. Client-side only.

Convert chmod octal (e.g. 755, 0644) to symbolic notation (rwxr-xr-x) and back. Classic rwx triplets. Runs in your browser.

Convert backslashes to forward slashes, collapse duplicate slashes, optional WSL path (C:\\ to /mnt/c/). Normalize POSIX-style paths. Client-side.

Remove slash and null bytes from file names (POSIX rules). One name per line. Safe for shell scripts and configs.

Format and prettify .desktop files (FreeDesktop). Group sections, indent keys. Comments preserved. 100% client-side.

Escape text for use inside bash single-quoted strings. Uses the usual quote-break pattern for apostrophes. Copy-paste safe for shell scripts.

Format and beautify Apple plist XML. Validates structure in your browser. For Info.plist, entitlements, and Xcode configs. 100% client-side.

Convert file:// URLs to POSIX paths. Decodes percent-encoding. Works with file:/// and file://localhost/. Runs in your browser.

Remove slash, null bytes, and colons from file names for Finder-safe names. One name per line. Client-side only.

Escape text for use inside AppleScript double-quoted strings. Backslash and quote rules. Copy-paste safe for Script Editor.

Validate and normalize reverse-DNS bundle identifiers (com.example.app). Lowercase segments for CFBundleIdentifier. Runs in browser.

Create a .zip archive from multiple files or an entire folder. Download the ZIP instantly. 100% client-side in your browser.

Open a .zip file, list contents, and download individual files. Unzip without installing software. 100% client-side — your archive never leaves your device.

Shift Latin letters by 1 positions (Caesar cipher). Numbers and punctuation unchanged. 100% client-side.

Shift Latin letters by 2 positions (Caesar cipher). Numbers and punctuation unchanged. 100% client-side.

Shift Latin letters by 3 positions (Caesar cipher). Numbers and punctuation unchanged. 100% client-side.

Shift Latin letters by 4 positions (Caesar cipher). Numbers and punctuation unchanged. 100% client-side.

Shift Latin letters by 5 positions (Caesar cipher). Numbers and punctuation unchanged. 100% client-side.

Shift Latin letters by 6 positions (Caesar cipher). Numbers and punctuation unchanged. 100% client-side.

Convert Unix seconds or milliseconds to UTC ISO and GMT string. Detects ms vs s automatically. 100% client-side.

Parse an ISO or UTC date string and get Unix seconds. Runs in your browser.

Convert total seconds into hours, minutes, and seconds. No upload.

Parse durations like 1:30:45 or 90:00 into total seconds.

Turn large second counts into days, hours, minutes (e.g. 90061 → 1d 1h 1m).

Pick a random clock time between two HH:mm values. Useful for testing.