UUID Generator
Generate cryptographically random v4 UUIDs in bulk. Uppercase or braces if your DB needs them.
Quick answer: Generate cryptographically random v4 UUIDs in bulk. Uppercase or braces if your DB needs them.
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Frequently asked questions
- How do I generate a UUID?
- Pick how many you need (up to 1,000) and click Generate. Copy the whole list with one click.
- Which UUID version is this?
- Version 4 — random. The 13th character is always 4 and the 17th is one of 8/9/a/b, as required by the spec.
- Is the random source secure?
- Yes — we use crypto.randomUUID() which the browser backs with a CSPRNG. Safe for tokens, IDs and database keys.
- What's the chance of a collision?
- Astronomical. Generating a billion UUIDs per second for a hundred years gives ~50% chance of one collision — fine for any real-world workload.
- Should I use uppercase?
- Lowercase is the conventional canonical form. Uppercase only if a tool or DB requires it.
- Why wrap in braces?
- Microsoft tooling (.NET, SQL Server) often expects the `{xxxx-xxxx-...}` format. Toggle this on if you're feeding those.
- Is anything sent to a server?
- No. Generation runs entirely in your browser.
- Can I generate sequential UUIDs?
- v4 UUIDs are random, not sequential. If you need lexicographically sortable IDs, use the ULID Generator.
- Can I generate UUIDs on mobile?
- Yes. Phones and tablets work the same as desktops.
- Is this UUID generator free?
- Yes — free, no signup, no limits.