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UUID Generator🔒 100% local
Generate UUIDs (v1, v4, v7) in multiple formats. Bulk generation up to 1000 IDs.
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Generates between 1 and 1000 identifiers in one of three flavours - v4 random, v1 time-based, v7 timestamp - and prints them in standard, compact (no hyphens), urn:uuid: prefixed or brace-wrapped form. Values come from Date.now() and Math.random() inside the page, so an ID created here is not derived from a server and is not transmitted; the list can be copied in one go or downloaded as a .txt file.
How to use it
- Set Count between 1 and 1000 and pick a Version and Format from the dropdowns.
- Press Generate, or just read the ten v4 UUIDs the page produces when it first loads.
- Use Copy next to a single row, Copy All, or Download .txt to take the full set.
Worked example
Version v4, Format standard, Count 10becomese9d0df75-c382-4cb0-853f-d52fcc4282ddone of ten; every character after the version and variant positions is random, so a fresh run gives different values
Version v7, Format standard, Count 1 (clock frozen for this example)becomes01a0e4fb-591f-7cb8-8034-fba541edd74dthe first two groups are the millisecond timestamp; the rest is random. Verified against this site's own UUID Validator, which now accepts it
When to use it
- You need a batch of placeholder IDs to seed a database, a CSV or a test fixture.
- A form or API requires an idempotency key or correlation id and you just need a long random string quickly.
- You want the same identifier in urn:uuid: or brace form for a config file that expects that syntax.
What it does not do
- The v1 and v7 branches are time-ordered approximations, not full RFC 4122 v1: there is no real clock sequence, no MAC address and no monotonicity guarantee, so treat them as sortable IDs rather than spec-exact identifiers.
- The random parts use Math.random(), not crypto.getRandomValues(), so the values are not cryptographically unpredictable and should not be used as secrets, session tokens or guess-resistant ids.
- v1 and v7 both key off the same clock, so UUIDs generated in one batch can share a timestamp prefix and are not independently sortable or unique by construction.
- Version v1 output does not embed a node identifier, so two machines generating v1s in the same millisecond can collide by design here.