UUID Generator
Generate UUID v4 identifiers — single or bulk. Cryptographically random in your browser.
100% in your browser — files never uploaded.
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How to use the UUID Generator
- 1Use the controlsEach tool runs entirely in your browser — no uploads.
- 2Read the outputUpdates live, with errors flagged if input is invalid.
- 3CopyClick Copy to put the result on your clipboard.
About this tool
UUID v4 is a 128-bit random identifier with negligible collision risk (1 in 2^122). Used widely in databases, distributed systems and API keys where coordination-free uniqueness matters.
This tool uses `crypto.randomUUID()` where available and the `crypto.getRandomValues` PRNG as fallback — cryptographically random, not Math.random.
Frequently asked questions
Free?
Yes.
Truly random?
Cryptographic randomness from your browser's secure PRNG.
Collision risk?
Effectively zero for v4 within practical use.
Format?
Lowercase by default; toggle uppercase if needed.
Mobile?
Yes.
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