UUID generator
UUIDs from your browser's cryptographic random numbers. v7 starts with the creation time, so values sort in the order they were made.
How to use
- Choose the version and how many.
- Change case or hyphens and the list regenerates.
- Copy them.
Questions
v4 or v7?
v4 has 122 random bits. v7 puts a 48-bit millisecond timestamp first and fills the rest randomly, so values sort by creation time; that often suits database keys.
Can two collide?
For v4, the chance is negligible even after billions of values.
Does v7 reveal the time?
Yes, the creation time can be read from it. Use v4 where that should stay hidden.
Which standard?
Version and variant bits follow RFC 9562.
Are they stored?
No. They are generated in your browser only.
Related tools
- Password generatorStrong random passwords from your browser's cryptographic random generator. Choose length and character sets.
- Unix timestamp converterUnix timestamps (seconds or milliseconds) to dates in several time zones, and dates back to timestamps.
- Base64 encode / decodeEncode text to Base64 and decode Base64 back to text, with full UTF-8 (Korean, Japanese, emoji) and URL-safe output.
- URL encode / decodePercent-encode text or URLs and decode %XX sequences back to readable text, with a table of query parameters.
- JSON formatter & validatorPretty-print or minify JSON, sort keys, and see exactly which line and column a syntax error is on.