Free Developer Tools
A collection of free, privacy-first tools that run entirely in your browser. No sign-up, no server uploads.
Core Products
Free AccountJSON Formatter
Format, beautify, and validate JSON instantly.
TextPad
Free online notepad with auto-save and markdown preview.
JWT Decoder
Decode JWT tokens, view header/payload, check expiry.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes from text or files.
HMAC Generator
Generate HMAC signatures with SHA-256, SHA-512, and more.
AES Encrypt / Decrypt
Symmetric encryption with AES-GCM, CBC, CTR and 128/192/256-bit keys.
RSA Key Generator
Generate RSA key pairs, encrypt and decrypt with public/private keys.
Password Generator
Generate cryptographically secure random passwords with strength meter.
Barcode Generator
Generate Code 128, EAN-13, UPC, and more barcode formats.
ECDSA Sign & Verify
Elliptic curve digital signatures with P-256, P-384, P-521 curves.
PBKDF2 Key Derivation
Derive cryptographic keys from passwords with configurable iterations.
Random Byte Generator
Generate cryptographically secure random bytes in multiple formats.
PEM / Certificate Decoder
Decode X.509 certificates, RSA/EC keys. View subject, issuer, validity.
Word Counter
Count words, characters, sentences, paragraphs, and reading time.
Case Converter
Convert text to camelCase, snake_case, kebab-case, Title Case, and more.
Slug Generator
Convert text to clean, URL-friendly slugs with custom separators.
String Diff Checker
Compare two texts side-by-side and highlight additions and deletions.
Text Escape / Unescape
Escape and unescape HTML entities, Unicode, JSON, URL, and more.
Markdown to HTML
Convert Markdown to raw HTML output with live preview.
HTML Formatter
Format, prettify, or minify HTML code instantly.
CSS Formatter
Beautify or minify CSS code with configurable indentation.
JS Minifier
Minify JavaScript by removing comments and whitespace.
SQL Formatter
Prettify SQL queries with proper indentation and keywords.
YAML ↔ JSON
Convert between YAML and JSON formats instantly.
CSV to JSON
Parse CSV data into JSON with custom delimiters and file upload.
Cron Parser
Parse cron expressions into human-readable descriptions.
HTTP Status Codes
Searchable reference of all HTTP status codes with descriptions.
Regex Cheat Sheet
Quick reference for regex patterns with examples. Click to copy.
Color Palette Generator
Generate harmonious color schemes with multiple harmony types.
Tailwind CSS Colors
Browse and search all Tailwind CSS color classes.
Contrast Checker
Check WCAG color contrast ratios for accessibility.
SVG to CSS Background
Convert SVG to inline CSS background-image data URI.
Favicon Generator
Create favicons from text or emoji with custom colors.
Aspect Ratio Calculator
Calculate dimensions maintaining aspect ratio.
Number Base Converter
Convert between binary, octal, decimal, and hexadecimal.
Unit Converter
Convert px/rem/em, bytes/KB/MB, temperature, length, weight.
IP Address Info
Validate IPs, calculate CIDR ranges, subnet masks.
Chmod Calculator
Calculate Unix file permissions in numeric and symbolic.
Data Size Calculator
Convert data sizes and estimate transfer times.
Image Resizer
Resize and compress images in-browser with Canvas API.
Image to Base64
Convert images to Base64 data URIs for embedding.
SVG Optimizer
Optimize SVG markup by removing unnecessary code.
Placeholder Image
Generate placeholder images with custom dimensions and colors.
Image Color Picker
Extract colors from uploaded images. Build palettes.
ICO Converter
Convert PNG/JPG to favicon ICO sizes.
Pomodoro Timer
Focus timer with 25min work and 5min break sessions.
Stopwatch
Precise stopwatch with lap tracking and milliseconds.
Countdown Timer
Countdown to any future date with live display.
Meta Tag Generator
Generate HTML meta tags for SEO and social media.
Open Graph Preview
Preview how links appear on social platforms.
robots.txt Generator
Build robots.txt files with allow/disallow rules.
.htaccess Generator
Generate Apache .htaccess rules for redirects and security.
JSON Schema Validator
Validate JSON data against a JSON Schema.
Emoji Picker
Browse, search, and copy emojis by category.
Base64 Encode / Decode
Encode text to Base64 and decode it back instantly. Client-side.
Base32 Encode / Decode
Encode and decode Base32 strings following RFC 4648.
Base58 Encode / Decode
Encode and decode Base58, the encoding used by Bitcoin and IPFS.
URL Encoder / Decoder
Encode and decode URLs and query parameters instantly.
UUID Generator
Generate UUID v4 identifiers. Bulk generate up to 100 at once.
NanoID / ULID Generator
Generate compact URL-safe NanoIDs and sortable ULIDs securely.
Timestamp Converter
Convert Unix timestamps to human-readable dates and back.
Regex Tester
Test and debug regular expressions with live match highlighting.
Binary / Text Converter
Convert text to binary and back with full Unicode support.
Morse Code Translator
Translate text to Morse code and Morse code back to text.
Roman Numeral Converter
Convert numbers to Roman numerals and back (1 to 3999).
Color Converter
Convert colors between HEX, RGB, HSL, and other formats.
CSS Gradient Generator
Create linear & radial CSS gradients with a live preview.
Box Shadow Generator
Create CSS box-shadow effects visually with multi-layer support.
Border Radius Generator
Design CSS border-radius visually with per-corner control.
Clip Path Generator
Create CSS clip-path shapes with a live preview and copy code.
CSS Animation Generator
Build CSS keyframe animations with a visual editor and preview.
Cubic Bezier Editor
Design custom CSS cubic-bezier easing curves with live motion.
Flexbox Generator
Visually build CSS flexbox layouts and copy the code.
Grid Generator
Design CSS grid layouts with adjustable columns, rows, and gap.
Lorem Ipsum Generator
Generate placeholder text by paragraphs, sentences, or words.
Markdown Preview
Write markdown and see the rendered preview in real-time.
JSON to CSV
Convert a JSON array of objects to CSV with nested flattening.
JSON to TypeScript
Convert JSON to TypeScript interfaces with nested type support.
JSON-LD Generator
Generate schema.org JSON-LD structured data for SEO.
XML to JSON
Convert XML markup to structured JSON, with attribute handling.
UTM Builder
Build campaign-tagged URLs with UTM parameters for analytics.
.gitignore Generator
Build .gitignore files from common language and editor templates.
What Is My IP
Find your public IP, approximate location, and connection details.