Developer Tools

Format, validate and explore JSON in code, tree, form, text or read-only view.

Diff two JSON documents — paste them or drop the files — and see exactly what changed.

Decode JWT header and payload and inspect expiry claims.

Generate cryptographically random UUID v4 identifiers in bulk.

Encode text or any file to Base64, with full Unicode support and one-click decoding.

Decode Base64 back to text or to the original file, with encoding in the same tool.

Percent-encode text for safe use in URLs and query strings.

Turn percent-encoded URLs back into readable text.

Create strong random passwords with a live strength estimate.

Compute SHA-256 hashes of any text instantly.

Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or a file, in your browser.

Convert Unix epoch seconds to dates and back.

Generate a SHA-512 hash of any text or file, with a checksum comparison built in.

Live Markdown editor with split-view HTML preview and export.

Turn any title into a clean, SEO-friendly URL slug with a live score.