UUID Generator
Generate cryptographically random UUIDs.
Runs entirely in your browser — your data is never uploaded to any server.
How it works
- Choose how manyOne, or up to 500 at a time.
- Set the formatCase, hyphens and brace wrapping.
- Copy the listCopy all, or download as a text file.
What this tool does
- Version 4 UUIDs from a cryptographic random source
- Batch generation up to 500 identifiers
- Uppercase, brace and hyphen formatting options
- Generated locally — never transmitted or stored
Frequently Asked Questions
A 128-bit identifier where the bits are random apart from a fixed version and variant marker. It requires no central coordination.
In theory, but the odds are so small that generating billions per second for a century still leaves collision effectively impossible.
The randomness comes from the Web Crypto API, so it is suitable. That said, session tokens are usually better served by a purpose-built token format.
None functionally — GUID is Microsoft's name for the same thing, conventionally written in braces and uppercase.
Privacy and security
Your input is processed by JavaScript running inside your browser. Nothing you paste is sent over the network, logged, or stored — which is what makes this safe to use with production data. If you want to check this yourself: open your browser’s developer tools, switch to the Network tab, and use the tool — you will see no request carrying your file or input leave the page.
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