The developer toolkit that never leaves your browser.
Formatters, encoders, generators and text utilities — all in one place. Zero tracking, zero server roundtrips, zero JavaScript bloat. Powered by Astro.
- Tools
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All tools
Pick a tool. Get to work.
Every tool below runs entirely in your browser. Your code, your data, your tokens — none of it ever touches a server.
Formatters
8JSON Formatter
Beautify, validate and minify JSON with Prettier.
JavaScript Formatter
Format and prettify JavaScript code with Prettier.
CSS Formatter
Beautify or compress CSS stylesheets with Prettier.
HTML Formatter
Pretty-print HTML with proper indentation.
XML Formatter
Pretty-print and validate XML documents.
SQL Formatter
Format SQL queries in 12+ dialects with sql-formatter.
YAML Formatter
Validate and prettify YAML config files.
Markdown Formatter
Normalize and prettify Markdown documents.
Encoders & Decoders
4Base64 Encoder / Decoder
Encode text to Base64 or decode it back. Unicode-safe.
URL Encoder / Decoder
Percent-encode or decode URLs and query parameters.
JWT Decoder
Decode JSON Web Tokens and inspect header & payload.
HTML Entity Encoder
Escape or unescape HTML entities (&, <, >, etc.).
Generators
5UUID Generator
Generate RFC 4122 v4 UUIDs in bulk.
Hash Generator
Compute SHA-1, SHA-256, SHA-384, SHA-512 hashes.
QR Code Generator
Generate downloadable QR codes for any text or URL.
Color Converter
Convert between HEX, RGB, HSL and CSS names.
Cron Expression Parser
Translate cron expressions into human-readable English.
Text Utilities
3Visualizers
5Algorithm Visualizer
Step-through animations for sorting and pathfinding algorithms.
Big-O Visualizer
Interactive growth-curve chart for common complexity classes.
Data Structure Visualizer
Animated operations on linked lists, trees, stacks and hash tables.
Regex Visualizer
See regex matches highlighted and the pattern broken down visually.
CSS Flexbox / Grid Playground
Adjust flexbox and grid properties visually and copy the CSS.
Data & Conversion
5CSV ↔ JSON ↔ YAML ↔ XML
Convert between CSV, JSON, YAML and XML formats.
JSON → TypeScript / Python
Generate TypeScript interfaces or Python dataclasses from JSON.
CSV → Chart Generator
Paste CSV data and create bar, line or pie charts, exportable as PNG.
Markdown Table Generator
Build Markdown tables from a visual grid or pasted data.
Cron Expression Builder
Build cron expressions with dropdowns and see next run times.
Cheatsheets & Reference
6Git Command Cheatsheet
Categorized Git commands with copy buttons and undo pairings.
Docker Command Cheatsheet
Categorized Docker commands for images, containers, volumes and more.
Linux / Bash One-Liners
Common shell one-liners for find, grep, sed, awk and more.
HTTP Status Code Reference
Searchable list of all HTTP status codes with explanations.
Keyboard Shortcuts
Searchable cheatsheets for VS Code, Vim and Terminal shortcuts.
.gitignore Generator
Multi-select your stack and generate a combined .gitignore file.
Dev Utilities
4Cron Next-Run Calculator
Paste a cron expression and see the next N run times.
Color Palette & Contrast Checker
Generate palettes from a base color and check WCAG contrast ratios.
Favicon & OG Image Generator
Upload an image and generate all favicon sizes plus OG preview.
Fake Data Generator
Generate realistic fake names, emails, addresses and lorem ipsum.
Command Line
4PowerShell Cheatsheet
Essential PowerShell commands for file operations, processes, and system management.
NPM Cheatsheet
Quick reference for package installs, script executions, versions, and config.
Bash Cheatsheet
Quick guide for general Bash / Shell commands and shortcuts.
Windows CMD Cheatsheet
General Windows Command Prompt commands for administration and utility.
Private by design
All processing happens in your browser. We never receive, log, or store any input you paste into a tool. There is no backend.
Fast by default
Built on Astro, which ships zero JavaScript by default. Pages load instantly on any connection. The only JS that loads is what a specific tool actually needs.
Free forever
Every tool is free with no signup, no rate limits, no upsell. Ads keep the lights on — that's it. No data ever sold.