UUID Generator
Generate secure UUID v4 identifiers online. Batch generation, formatting options and one‑click copy.
About UUID Generator
Generate RFC 4122 version 4 UUIDs for identifiers and testing. Choose count and output format, then copy in one click. For transport, use URL encoding/decoding or Base64 encoding/decoding.
Runs locally in your browser using crypto‑secure randomness. No data is uploaded. For logs or APIs carrying JSON metadata, pretty‑print with the JSON Formatter.
Common Use Cases
- Create unique IDs for apps and services
- Use as database keys or message IDs
- Name files or resources safely
- Seed test data and mocks
How It Works
- Generates UUID v4 with version and variant bits
- Uses crypto.getRandomValues for secure randomness
- Optional hyphens, uppercase and braces
- Copy one or copy all results
FAQ
Are collisions possible?
Extremely unlikely for v4 UUIDs; probability is negligible for typical use.
How many can I generate at once?
Up to 100 in one batch to keep UI responsive.
Is randomness secure?
Yes, uses browser crypto API when available.
Can I change the format?
Toggle hyphens, uppercase and braces in settings.