UUID Generator
Generate cryptographically-random version-4 UUIDs in bulk, in your browser.
How to generate UUIDs
- Set the count. Choose how many UUIDs you need, up to 1,000.
- Set the format. Toggle uppercase and hyphens as needed.
- Generate and copy. Click "Regenerate," then "Copy all."
What happens to your data
This UUID generator creates identifiers with the browser's secure crypto.randomUUID() API, entirely on your device — nothing is sent to a server, so the values are private and it keeps working offline.
A UUID (also called a GUID) is a 128-bit identifier. This tool produces version-4 UUIDs, which are fully random, and lets you copy a whole batch at once for seeding databases, tests or config files.
What this generator supports
Common reasons to generate UUIDs
- Seed test data with a batch of unique identifiers.
- Generate a primary key or request ID during development.
- Create unique filenames or tokens without writing a script.
- Quickly grab one UUID to paste into a config file or ticket.
Frequently asked questions
Is this data uploaded anywhere?
No. UUIDs are generated and displayed entirely in your browser.
Are these cryptographically random?
Yes — generated with crypto.randomUUID(), which relies on the browser's cryptographically secure random number generator.
Can I generate more than 1,000 at once?
Not in one batch — 1,000 is the current limit per generation; run it again for more.
Could two UUIDs collide?
Practically no — version-4 UUIDs have enough randomness that collisions aren't a realistic concern, even across many batches.
Can I remove the hyphens or change the case?
Yes — toggle uppercase and no-hyphen formatting independently.
Is a UUID the same as a GUID?
Yes — GUID (globally unique identifier) is Microsoft's name for the same 128-bit standard. The values this generator produces are valid as both UUIDs and GUIDs.
What version are these UUIDs?
Version 4, which is fully random. Unlike version 1, a v4 UUID contains no timestamp or MAC address, so it leaks no information and does not sort chronologically.
Does it work offline?
Yes. Because generation uses your browser's built-in crypto API, the tool keeps working after the page has loaded even without a connection.
Related guides
Last reviewed: August 2026