Text/Utilities
UUID / GUID Generator
Generate random UUID v4, time-ordered UUID v7, or the nil UUID in bulk. Copy or download. Uppercase and no-hyphen options.
About the UUID / GUID Generator
Generate cryptographically random UUIDs (v4), sortable time-ordered UUIDs (v7), or the nil UUID — one at a time or in bulk.
What this tool does
Create universally unique identifiers directly in your browser using the Web Crypto API for strong randomness. Choose the version, how many you need, and formatting options like uppercase, no hyphens, or curly braces.
Which version should I use?
Pick based on how the ID will be used:
- v4 — random. The default choice for most applications and database keys.
- v7 — time-ordered. Sorts by creation time, which makes it index-friendly for databases.
- nil — all zeros. A placeholder or 'empty' UUID value.
Common uses
UUIDs are ideal when you need unique values without a central authority:
- Primary keys and record IDs in databases.
- Idempotency keys and request IDs in APIs.
- File names, session tokens, and correlation IDs.
FAQ
Are these UUIDs random and safe?
Yes. They use your browser's cryptographically secure random number generator (Web Crypto), and everything runs locally.
What is the chance of a collision?
For UUID v4 it is astronomically small — you would need to generate billions per second for many years to have a realistic chance of a duplicate.
Can I generate many at once?
Yes, up to 1,000 at a time. Copy them all or download as a text file.
Is UUID the same as GUID?
Yes. GUID (Globally Unique Identifier) is Microsoft's name for the same 128-bit UUID standard.
Related tools
Pro tip: pair this tool with Upside Down Text Generator and Text Similarity Checker for a faster SEO workflow.