Fast transformations with predictable output.
Everything runs locally in your browser.
Format and validate JSON with syntax highlighting and error detection.
Convert Unix and ISO timestamps with explicit timezone context.
Encode and decode Base64 strings in standard or URL-safe mode.
Encode and decode URL values with one shared input.
Decode JWT header/payload and inspect exp, nbf, and iat claim diagnostics.
Test patterns, inspect capture groups, and explain regex behavior.
Generate SHA-256/384/512 hashes and HMAC digests.
Generate canonical UUID v4 values with copy-friendly batch output.
Validate UUID lists line-by-line in strict canonical mode.