UUID Generator

You are setting up a new microservice and need primary keys that won't collide across databases, regions, or teams — without coordinating through a central ID server. That is the exact problem UUIDs solve, and this tool generates them instantly in your browser.

Two versions are supported: Version 4 (random) and Version 7 (time-ordered). UUID v4 draws 122 random bits from crypto.getRandomValues(). The collision probability? You would need to generate 2.71 x 10^18 UUIDs (2.71 quintillion) before reaching a 50% chance of a single duplicate. UUID v7 embeds a 48-bit Unix millisecond timestamp in the most significant bits, giving UUIDs natural chronological ordering — ideal for B-tree-indexed database primary keys where insert performance matters. Convert embedded timestamps with our Timestamp Converter.

Generate a single UUID or bulk-generate 5, 10, 50, or 100 at once. Copy individually, copy all, or download the list as a text file. The Validate section lets you paste any string to check validity and detect the version. For v7 UUIDs, the embedded timestamp is extracted and displayed.

All generation uses the Web Crypto API and runs entirely client-side. No UUIDs are sent to or stored on any server. For content-derived identifiers, see our Hash Generator or Password Generator.

1. Select UUID v4 or UUID v7 using the badges at the top.
2. Click a generate button (1, 5, 10, 50, or 100) to create UUIDs.
3. Hover over any UUID and click the copy icon to copy it. Use Copy All or Download for bulk export.
4. To validate a UUID, paste it into the Validate UUID input. The tool shows whether it is valid and which version it is.
5. Press Ctrl+Shift+C to copy all generated UUIDs.