Regex Tester

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.

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.

Unicode Escape Converter

Encode and decode Unicode escapes — \uXXXX, \u{XXXXXX}, CSS \XXXXXX, JSON, and percent-encoded UTF-8 — all in your browser.

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.

HTML Entity Encoder & Decoder

Encode and decode HTML entities — minimal, named, numeric, or all non-ASCII. Live preview, copy, swap, in your browser.