UUID Generator
Generate RFC 4122 version 4 UUIDs instantly. Create a single UUID or bulk-generate up to 1000 at once, with per-row copy buttons and a copy-all option.
Click "Generate" to create UUIDs.
Why use this tool?
UUIDs are the backbone of modern distributed systems. Whether you need a unique database key, a session token, or test data for your API, this generator produces cryptographically random UUIDs that conform to the RFC 4122 v4 standard.
- Cryptographically secure — uses the browser's native crypto API for randomness.
- Bulk generation — generate up to 1000 UUIDs in one click.
- Per-row copy — copy any individual UUID with a single click.
- Uppercase option — switch between lowercase and uppercase hex digits.
How to use
- Enter the number of UUIDs you want (1 to 1000).
- Optionally check "Uppercase" for uppercase hex output.
- Click Generate to create the UUIDs.
- Click the Copy button next to any UUID to copy it individually.
- Click Copy All to copy all UUIDs at once (one per line).
Frequently Asked Questions
A UUID (Universally Unique Identifier) is a 128-bit identifier represented as a 36-character string with hyphens. UUID v4 uses random numbers to generate identifiers that are statistically guaranteed to be unique.
UUID v4 is the most common UUID version. It uses randomly generated bits for the identifier, with specific bits reserved for the version and variant fields as defined in RFC 4122. This makes collisions extremely unlikely.
You can generate up to 1000 UUIDs at once with this tool. Each UUID is independently random and can be copied individually.
Yes. This tool uses the browser's native crypto.getRandomValues API, which provides cryptographically strong random values suitable for most production use cases including database keys and session tokens.