JSON Formatter & Validator

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.

UUID Generator

Generate cryptographically secure UUIDs (v4 random and v7 time-ordered) instantly — in your browser, with hyphens, casing, and braces formatting.

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.