UUID Generator
Generate random UUIDs / GUIDs instantly
UUID Generator is a free online tool from BrowserUtils that generate random uuids / guids instantly. It runs entirely in your browser — your data never leaves your device. No account required.
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How to use UUID Generator
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About UUID Generator
Free online UUID/GUID generator. Create random version 4 UUIDs for databases, APIs, and unique identifiers. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
UUID Generator specs
- Runtime
- 100% client-side (browser)
- Built on
- Web Crypto API (SubtleCrypto) for hashing and crypto.getRandomValues for secure randomness
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information. Version 4 UUIDs are randomly generated and have an extremely low chance of collision.
UUID vs GUID: what is the difference?
UUID and GUID are the same thing. UUID is the standard term used in RFCs and most programming languages, while GUID (Globally Unique Identifier) is the term used by Microsoft.
Can I generate multiple UUIDs at once?
Yes, specify how many UUIDs you need and the tool will generate them all at once, ready to copy.
Are the generated UUIDs truly unique?
Version 4 UUIDs are generated using cryptographically secure random numbers. The probability of a collision is astronomically low — about 1 in 5.3 × 10^36 for a single pair.
Does the UUID generator work offline?
Yes, UUIDs are generated entirely in your browser using the Web Crypto API. No internet connection or server call is needed.
What is the format of a UUID v4?
A UUID v4 looks like 550e8400-e29b-41d4-a716-446655440000 — five groups of hexadecimal digits separated by hyphens, totaling 36 characters. The 13th character is always "4" to indicate version 4.
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