UUID Generator
Generate up to 1000 UUIDs at once: random version 4, or version 7, which starts with the creation time so new IDs sort in order. Choose uppercase, no hyphens or braces, then copy or download them. Paste any UUID to see its version, variant and, for v1, v6 and v7, when it was created. UUIDs are made in your browser with its secure random number generator.
Runs locally in your browserCheck a UUID
How to use UUID Generator
- Pick a version. Choose v4 for random IDs or v7 for time-ordered IDs.
- Set the amount and format. Enter how many you need (up to 1000) and choose uppercase, hyphens or braces.
- Generate. Click Generate, then copy the UUIDs or download them as a text file.
Example
Checking a version 7 UUID to see when it was created.
UUID
01890a5d-ac96-774b-bcce-b302099a8057
Details
Version 7, Unix time-ordered (v7) Variant: RFC 9562 Created: 2023-06-30T03:34:18.518Z
The first 12 hex digits of a v7 UUID are the creation time in milliseconds.
Formats, limits and privacy
- Input
- Plain text
- Output
- Plain text
- Limits
- Up to 1000 UUIDs per click.
- Generates versions 4 and 7; the checker reads any version.
- Creation times are shown only for time-based versions 1, 6 and 7.
- Privacy
- Everything happens in your browser. Your input is never uploaded to a server.
Troubleshooting
My database rejects the UUIDs
Some columns expect the plain 36-character form. Turn off braces and keep hyphens; uppercase is fine for most databases.
"Not a UUID" when checking
A UUID is 32 hex digits, usually grouped 8-4-4-4-12. Check for a missing or extra character, or letters beyond f.
v7 UUIDs from the same batch look almost identical
That is by design: they share the same creation time at the start and are kept in increasing order. The random part at the end still makes each one unique.
Frequently asked questions
Should I use v4 or v7?
Use v4 when you just need a unique random ID. Use v7 for database keys: it starts with a timestamp, so new rows are added in order, which keeps indexes fast. Both are unique for practical purposes.
Are these UUIDs secure and unique?
They use your browser's cryptographic random number generator, never Math.random. A v4 UUID has 122 random bits, so a collision is practically impossible. Do not use a UUID as a password or secret token, though: v7 reveals when it was created.
Is a GUID the same as a UUID?
Yes. GUID is Microsoft's name for the same 128-bit identifier. Tick Uppercase and Braces for the {XXXXXXXX-...} style some Microsoft tools use.
What does checking a UUID show?
Its version (for example random v4 or time-based v1, v6 or v7), its variant, the standard lowercase form and, for time-based versions, the moment it was created.