UUID Generator
Generates standard version-4 UUIDs — as many as you need in one click, using the browser's cryptographic random source. Each is a 36-character identifier like 550e8400-e29b-41d4-a716-446655440000, unique for practical purposes without any central registry.
How to use
- Set how many you need.
- Generate.
- Copy individual IDs or the whole batch.
- Each click produces fresh ones — UUIDs are not meant to be reused.
When you actually need this
- Assigning IDs to records, devices or documents without a central counter.
- Filling test fixtures and seed data with realistic identifiers.
- Creating correlation IDs to trace a request across services.
- Naming uploads so parallel writers can never collide.
How unique is "universally unique"?
A v4 UUID carries 122 random bits: the birthday-problem math says you would need to generate about a billion UUIDs per second for roughly 85 years before a collision became even a 50-50 proposition. Generation here uses the browser's cryptographic randomness. Two design notes: UUIDs are identifiers, not secrets — do not use one as a password or token, since formats and generation are public knowledge; and v4's randomness scatters database index inserts, which is why newer time-ordered variants (v7) exist for high-volume primary keys. For everything short of that, v4 is the safe default.
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FAQ
Does UUID Generator send my input to a server?
No. The conversion runs in JavaScript inside the page, so API keys, tokens, config files and any other sensitive text stay on your machine. You can verify this by opening your browser's network tab while you use the tool.
Does UUID Generator handle Unicode and non-ASCII characters?
Yes. Text is processed as UTF-8, so accented Latin, Korean, Japanese, Chinese, Cyrillic, Arabic and emoji all round-trip correctly rather than turning into question marks.
Can I use the output in production code?
Yes — the output follows the relevant standard exactly and is safe to paste into your project. As with any tool, run your own tests before shipping anything that depends on it.