Web developer tools.
That load instantly and work offline.
Token Counter
Count tokens for GPT, Claude, Gemini, Llama, Mistral, and other models.
Linux Sandbox
Boot a full Linux container in your browser. No server, no upload, your files stay local.
JSON Formatter
Validate, pretty-print, and minify JSON with precise error locations.
Regex Tester
Test regular expressions with live highlighting, capture groups, and copy-as-code.
Cron Parser
Parse cron expressions to plain English and preview next fire times.
Diff Viewer
Compare two pieces of text side-by-side or unified, with stats and patch export.
Timestamp Converter
Convert Unix timestamps to dates across timezones — seconds, ms, ISO 8601, and more.
Color Converter
Convert between hex, rgb, hsl, oklch, oklab — with contrast checks and pairings.
Base64 Encode / Decode
Encode and decode Base64 — text and files, with URL-safe variant.
JWT Decoder
Decode JWT header and payload claims. (No signature verification.)
URL Encoder & Inspector
Encode, decode, and inspect URLs — protocol, host, path, query, fragment.
Hash Generator
Compute MD5, SHA-1/256/384/512, SHA-3, CRC32, and HMAC variants for text and files.
HTML Entities
Encode and decode HTML entities — named, numeric, or hex.
UUID Generator
Generate UUID v4 and v7 IDs. Single, bulk, and copy-ready.
Lorem Ipsum
Generate placeholder text — classic Latin, hipster, corporate, or tech jargon.