How to use the UUID generator
- Choose how many UUIDs you need.
- Click Generate, then copy one (tap it) or use Copy all.
What is a UUID?
A UUID (Universally Unique Identifier), also called a GUID, is a 128-bit value used to label data uniquely — database keys, file names, API records — without a central authority. Version 4 UUIDs are randomly generated, making collisions practically impossible.
Benefits
- Generates random UUID (v4) identifiers instantly, in bulk.
- Useful for database keys, test data and unique references.
- Runs in your browser with nothing to install.
- Free and unlimited.
Limitations to know
- A UUID is an identifier, not a secret — it is not meant to be a password or security token.
- Random (v4) UUIDs are not sortable by time the way some other ID schemes are.
- The tiny theoretical chance of a collision, while negligible, is not zero.
Common mistakes to avoid
- Using a UUID as a password or an access secret — it is not built to be unguessable.
- Exposing UUIDs you assumed were unguessable as if they were secure tokens.
- Storing them inconsistently (with and without hyphens or case) so lookups fail.
Alternatives
For secure login credentials use the Password Generator. For encoding data as text, use the Base64 Encoder.
Last updated: August 2026 · Reviewed by the AI Toolbox editorial team.
Frequently asked questions
Are these truly unique?
Version 4 UUIDs are random with such a vast range that duplicates are effectively impossible.
Is it free?
Yes, completely free with no sign-up.