JSON formatter, base64, URL encoder, regex tester, and more utilities for developers.
UUID Generator
Generate cryptographically secure UUIDs (v4 random and v7 time-ordered) instantly — in your browser, with hyphens, casing, and braces formatting.
Base64 Encoder / Decoder
Encode any text to Base64 — or decode Base64 back to plain text — instantly, with optional URL-safe output. Works fully in your browser with UTF-8 support.
URL Encoder / Decoder
Percent-encode any text for safe use in URLs — or decode encoded strings back to plain text. UTF-8 safe, instant, and fully private.
JSON Formatter & Validator
Pretty-print, minify, and validate JSON in your browser. Spot syntax errors with exact line and column numbers — no server, no upload.
HTML Entity Encoder & Decoder
Encode and decode HTML entities — minimal, named, numeric, or all non-ASCII. Live preview, copy, swap, in your browser.
JWT Decoder
Decode JSON Web Tokens to inspect header, payload, and signature. Highlights expiry, algorithm, issuer, and audience claims.
Regex Tester
Test JavaScript regular expressions with live highlighting, capture groups, named groups, and replacement preview.
Unicode Escape Converter
Encode and decode Unicode escapes — \uXXXX, \u{XXXXXX}, CSS \XXXXXX, JSON, and percent-encoded UTF-8 — all in your browser.
YAML ↔ JSON Converter
Convert between YAML and JSON with live preview. Pretty-print indentation, optional key sorting, and clear error messages.
Time-saving developer utilities that run entirely in your browser. No data leaves your device — formatters, validators, encoders, and decoders.