01
Pick a version
Version 4 is random. Version 7 starts with the current millisecond.
In this browser
UUID v4 / v7 Generator
Choose version 4 or version 7, pick a count from 1 to 100, then copy one value or the whole list. Version 7 carries a Unix millisecond timestamp. Version 4 does not.
Generate UUIDs
Choose a version and a count, then generate.
Three short steps
02
Set the count
Ask for one identifier, or up to 100. For a larger file, use the bulk page.
03
Copy
Copy one row, or copy the whole list with one UUID on each line.
What the two versions contain
128 bits
Both versions are 16 bytes, written as 36 characters with hyphens.
Version 4
The version digit is 4 and the variant digit is 8, 9, a, or b. The other bits come from a cryptographic random source.
Version 7
The first 48 bits are a Unix timestamp in milliseconds. The version digit is 7. The remaining 74 bits are random on this page.
Questions
Which versions does this generate?
This page generates UUID v4 and UUID v7. Version 4 is random. Version 7 places a 48-bit Unix millisecond timestamp in front, then the version and variant bits, then random bits from crypto.getRandomValues. The selected default is version 4.
Does UUID v7 increase with time?
Values from later milliseconds sort after values from earlier milliseconds when compared as 128-bit numbers or as canonical hex strings. This generator fills the other 74 bits at random. It does not use a counter, so two values from the same millisecond are not ordered.
Could two results match?
Duplicates inside one batch are replaced. A match with an identifier created somewhere else is extremely unlikely. No random generator can promise that a match is impossible.
Is the result stored?
No. The browser creates the values. Nothing is uploaded. Refreshing, switching language, or generating again clears the list.
Can I use a UUID as a password?
No. A UUID identifies a record. It is not a password, a session token, or a signing key.