UUID Generator
Generate cryptographically-random UUID v4s in bulk, with one-click copy.
Runs entirely in your browser — your input never leaves your deviceAbout this tool
This generator produces version-4 UUIDs using the browser's cryptographically securecrypto.randomUUID(), so the values are suitable for real identifiers, not just placeholders. Generate up to 100 at once, copy any single value, or copy the whole list.
Toggle uppercase or strip the hyphens to match your database or code style. Generation runs entirely on your device.
Why use it
Cryptographically random
Uses crypto.randomUUID() so values are safe for real identifiers.
Bulk + formatting
Generate up to 100 at once, with uppercase and no-hyphen options.
Copy fast
Copy any single UUID or the whole list.
Common use cases
- Seed database records or test data
- Generate request or correlation IDs
- Create unique file or key names
- Produce a batch of GUIDs
Frequently asked questions
Are these UUIDs random and safe to use?
Yes. They are version-4 UUIDs from the browser's cryptographically secure random source, the same primitive used for security-sensitive values.
What is a UUID v4?
A 128-bit identifier where most bits are random, giving an astronomically low chance of collision — ideal for database keys, request IDs and file names.
Can I generate them without hyphens or in uppercase?
Yes. Use the Hyphens and Uppercase toggles, then click Generate to apply your formatting.
Is anything sent to a server?
No. UUIDs are generated locally in your browser and never leave your device.