UUID Generator
Create UUIDs for databases, APIs and test data without a backend. Choose v4 for pure randomness or v7 for sortable, time-ordered identifiers.
Free Runs locally No signup
No UUIDs yet. Press Generate.
Check a UUID
v4 is random; v7 is time-ordered and better for database indexes.
How to use it
1
Choose a version
Use v4 for random identifiers or v7 for time-sortable ones.
2
Set the count
Generate between 1 and 100 UUIDs at once.
3
Copy or download
Copy the whole list or save it as a text file.
Why use this tool
Cryptographically random
v4 uses the browser secure random generator, not Math.random.
Time-ordered v7
v7 starts with a millisecond timestamp, so IDs sort by creation time.
Bulk generation
Create up to 100 identifiers in one click and export them.
Frequently asked questions
What is the difference between v4 and v7?
v4 is fully random. v7 embeds a 48-bit timestamp followed by random bits, which makes it sortable by creation time.
Are these UUIDs unique?
The random space is large enough that collisions are practically impossible, but no generator can guarantee absolute uniqueness.
Can I use them as database keys?
Yes. Prefer v7 for B-tree indexes because time-ordered values reduce page splits.
Does the tool send anything to a server?
No. UUIDs are generated in your browser with crypto.getRandomValues or crypto.randomUUID.
Are uppercase UUIDs valid?
Yes. UUIDs are case-insensitive, and this tool lets you switch between lower and upper case.
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