UUID Generator
v1, v4, v7 UUIDs
0c90c324-52f8-4742-85e5-dbe8fb773d37 207fefac-57b7-4a96-abde-9429bc1ab428 8c0be751-993c-4b9d-b15e-c08f0673bc5f 46f1fb1d-4946-4730-a26a-6972f147d8f5 bef8bad1-9655-4fe5-8223-a3e5162e8c86 ffe6173e-c1cd-4dd5-bf47-c603713834e8 92f2a427-6062-451c-a29e-18efaaaa6222 ac962778-4c6c-4d54-a151-02529e92af2c d484241e-0663-4ebc-8409-22b9c0911ce4 2b0bb3d2-21d5-492d-9755-825f23ed987b
What is UUID Generator?
Generate cryptographically random UUIDs — v4 (purely random) or v7 (time-ordered, RFC 9562). v4 is the standard choice for most IDs; v7 is better when you want IDs that sort chronologically at the database level, which can dramatically reduce index fragmentation. Generate up to 1000 at a time and download them as a text file.
How do I use UUID Generator?
- Pick v4 (random) or v7 (time-ordered).
- Set the count.
- Click Generate.
- Copy or download the list.
UUID Generator by the numbers
- Versions
- v4 (random), v1 (time-based)
- RNG
- crypto.randomUUID / getRandomValues
- Batch size
- Up to 10,000 per run
- Formats
- With hyphens, without, uppercase
- Export
- Copy, download .txt / .csv
Common use cases for UUID Generator
- Seeding primary keys for a database migration.
- Generating 10,000 test IDs for a load-test fixture.
- Creating a one-off correlation ID for a support ticket.
- Producing a stable anonymous session ID inside a script.
- Filling a column of unique values in a CSV.
Common pitfalls and how to avoid them
- v4 IDs leak ordering across requests — They do not — v4 is random. If you need order, switch to v1 (time-based) or v7 (ordered, post-draft).
- Hyphens are not wanted — Toggle "No hyphens" — the output becomes a raw 32-char hex string.
- Copying 10k IDs is slow — Use the "Download .txt" option instead of copy-to-clipboard for large sets.
When should I use UUID Generator?
Use v4 when you don't need ordering. Use v7 when inserting rows in many-IDs-per-second workloads where index locality matters. For sequential, human-friendly IDs, neither is right — a tiny custom scheme is better.
Which UUID version does it generate?
v4 by default (random) and v1 (time-based) on demand. v4 is what almost every application wants; v1 is only useful if you need a time-ordered component embedded in the ID.
Is crypto.randomUUID() used?
Yes when available — the browser's built-in generator. Falls back to crypto.getRandomValues() + v4 formatting when the API is missing.
Can I generate many UUIDs at once?
Yes. Set the count (up to 10,000) and copy the list. Useful for seeding databases or generating test IDs.
Is my file uploaded anywhere?
No. Everything runs in your browser. Your files never leave your device, and there is no server component for this tool.