Tools

Decode header and claims, or encode a new token signed with HS256/384/512.

Pretty-print, minify, and validate JSON.

Live match highlighting, groups, JS regex flags.

Convert between Unix timestamps, ISO 8601, and local/UTC date-time.

Encode and decode Base64 and URL-encoded strings.

Compare two blocks of text line by line.

Generate random v4 UUIDs, one at a time or in bulk.

Generate SHA-1/256/384/512 checksums via the Web Crypto API.

Convert a JSON array of objects to CSV, or CSV back to JSON.

Break a URL down into protocol, host, path, and query params.

Paste JSON, get a matching TypeScript interface.

Convert between px, rem, em, pt, vw, and vh.

Generate random passwords or passphrases using a cryptographically secure RNG.

Compute an HMAC signature for a message and secret key.

Write or paste a Content-Security-Policy header and see common risks flagged.