What does this tool do
The UUID Generator creates universally unique identifiers (UUIDs) version 4. Choose how many UUIDs to generate (1–1000) and whether to display them in standard format (with hyphens) or compact format (32 hex characters, no hyphens). All generation runs in your browser — no upload, no server. Useful for database keys, API tokens, correlation IDs, and any situation where you need a unique identifier.
How to use it
- Choose format — Standard (e.g.
550e8400-e29b-41d4-a716-446655440000) or Compact (e.g.550e8400e29b41d4a716446655440000). - Set count — Enter how many UUIDs to generate (1–1000).
- Generate — Click the Generate button. Results appear instantly.
- Copy — Click "Copy all" to copy the UUIDs to your clipboard. Multiple UUIDs are copied one per line.
How it works
The tool uses the Web Crypto API (crypto.randomUUID()) to generate UUID v4 values. Each UUID is 128 bits of cryptographically random data, formatted according to RFC 4122. The standard format includes hyphens for readability; the compact format omits them for use in URLs or identifiers where brevity matters.
All computation runs entirely in your browser. No data is sent to any server.
Use cases & examples
- Database primary keys — Use UUIDs instead of auto-increment IDs for distributed systems.
- API request IDs — Add a unique ID to each request for tracing and debugging.
- Session tokens — Generate unique session identifiers.
- File names — Create collision-free temporary file names.
- Correlation IDs — Track requests across microservices.
Example
Standard format: a1b2c3d4-e5f6-4789-0abc-def123456789
Compact format: a1b2c3d4e5f647890abcdef123456789
Limitations & known constraints
- Maximum count — No more than 1,000 UUIDs per single generation request (BR-082).
- Browser support — Requires
crypto.randomUUID(); supported in Chrome 92+, Firefox 95+, Safari 15.4+, and all modern browsers. - UUID version — Only UUID v4 (random) is supported. Time-based UUIDs (v1, v7) are not available.