UUID / GUID v4 Generator
Generate random version 4 identifiers locally, individually or in batches.
UUID or GUID: what is the difference?
GUID is the term historically used in the Microsoft ecosystem, while UUID is the standard name. Their usual representation uses the same five hexadecimal groups separated by hyphens.
Version 4 is primarily random and is suitable for producing technical identifiers without coordination between systems.
Use the result with confidence
Recommended workflow
- Use a non-sensitive representative input for generating a UUID/GUID v4.
- Run the operation and review the result before copying or exporting it.
- Validate the output in the target application or environment before relying on it.
What to verify
- Confirm the scope, units and input values before interpreting the output.
- Separate the observed result from the operational decision that follows from it.
- Validate the conclusion against the real target system, logs or configuration before changing production.
Questions about this tool
Is a UUID/GUID v4 guaranteed to be unique?
No absolute guarantee exists, but correctly generated v4 identifiers have enough randomness that collisions are extraordinarily unlikely for normal use.
Can a UUID be used as a secret?
No. An identifier is not an authentication secret, API key or password.
When should I avoid v4?
Use another UUID version only when your system specifically needs properties such as time ordering or namespace-derived determinism.