Developer

Format and validate JSON. Indented or minified output, with clear error messages.

Encode text to Base64 or decode Base64 back to text. UTF-8 safe.

Percent-encode or decode URL components.

Decode JWT header and payload locally. Signature is not verified — paste tokens at your discretion.

Generate random UUIDs (v4) in your browser. Bulk generation up to 100 at a time.

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text. Runs entirely in your browser.

Convert between JSON and YAML in either direction. Clear error messages with line numbers.

Check YAML syntax and surface every error with line and column. Built for k8s, GitHub Actions, and CI configs.

Test JavaScript regular expressions against text. See every match, capture groups, and flag effects in real time.

Compare two texts side by side. Line, word, or character-level diff with clear highlighting.

Encode reserved HTML characters to entities, or decode entities back. Optional escape for all non-ASCII.

Parse a URL or query string into key/value pairs, edit them, and rebuild a clean query string.