UUID Generator (v4)
Generate secure, random UUIDs (Universally Unique Identifiers) version 4 locally in your browser. Bulk generation supported.
Generated client-side using Crypto.randomUUID()
How it works
A quick explanation of what this tool does, and when it's useful.
A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. This tool generates Version 4 UUIDs, which are constructed using random numbers.
Format: xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
- x is any hexadecimal digit.
- 4 indicates version 4 (random).
- y is one of 8, 9, A, or B.
Because it uses the browser's cryptographic crypto.randomUUID() API, it is suitable for production use cases.
Frequently asked questions
Short answers to common questions about uuid generator (v4).
Are these UUIDs unique?+
Yes. Version 4 UUIDs use 122 bits of randomness. The probability of collision is astronomically low.
How many can I generate at once?+
You can generate up to 50 UUIDs at a time with this tool.