UUID Generator
Generate one or many random version-4 UUIDs using your browser’s cryptographic random source. Copy individually or all at once.
How to use the UUID Generator
- Choose how many UUIDs you need (1–100).
- Click Generate — fresh UUIDs appear in the list.
- Copy a single UUID with its button, or use Copy all for the whole list.
About this tool
UUIDs (universally unique identifiers) let independent systems create identifiers without coordinating with each other — no central counter, no database sequence, no clashes. They are the default choice for distributed systems, API keys’ public parts, file names and database primary keys.
This generator produces standard RFC 4122 version-4 UUIDs using the browser’s built-in cryptographic random number generator, the same source used for generating encryption keys. That makes the output suitable wherever unpredictability matters.
Generate up to 100 at a time for seeding test data or fixtures, and copy them individually or as a newline-separated list ready to paste into code, spreadsheets or SQL inserts.
Frequently asked questions
- What version of UUID does this generate?
- Version 4 (random) UUIDs, produced by the browser’s crypto.randomUUID() — 122 bits of cryptographically secure randomness.
- Can two generated UUIDs collide?
- The probability is astronomically small: you would need to generate about 2.7 × 10¹⁸ UUIDs to reach even a 50% chance of one collision.
- Are the UUIDs generated on a server?
- No — they are generated by your own browser. We never see them, which also means they cannot be logged or reused.
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