UUID v4 Generator
Generate random version 4 UUIDs with your browser’s cryptographic random source. Create up to 50 identifiers and copy them in the format your application expects.
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Processed locally in your browser — nothing you enter here is uploaded.
About UUID version 4
A UUID is a 128-bit identifier designed to be unique without coordinating with a central database. Version 4 UUIDs are generated from random data, making them useful for database keys, request identifiers, test fixtures, filenames, and distributed systems.
This tool uses the browser's cryptographic random-number generator, then sets the UUID version and variant bits required by the current UUID specification. Generation happens locally, so the UUIDs are not submitted to MiniUtil.
Output format
A standard UUID contains 32 hexadecimal characters in five hyphen-separated groups:
xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
The 4 identifies version 4. The first hexadecimal character in the fourth group encodes the UUID variant. Uppercase, braces, and omitted hyphens are presentation choices; they do not change the underlying 128-bit value.
How to use it
- Choose how many UUIDs you need.
- Select optional uppercase, braces, or compact formatting.
- Generate the identifiers.
- Copy one UUID or the full list.
Practical guidance
- Version 4 is a strong general-purpose choice when identifiers do not need to be sortable.
- Keep a database uniqueness constraint for application-level protection.
- UUIDs are identifiers, not secrets. Do not use them as passwords, session tokens, or authorization checks.
- If you need Microsoft-style defaults, use the GUID Generator for .NET and Windows.
The tool works in modern browsers that provide the Web Crypto API.
Share this utility
Send the tool, not any text or files you entered. Input is never added to the share URL.
Continue the workflow
Identifiers & Encoding Toolkit
Step 1 of 5. Keep the context and finish the related checks.
Where this comes from
Sources and standards
- RFC 9562: Universally Unique IDentifiers (UUIDs)
Defines UUID versions, including the time-ordered version 7.
- MDN: Crypto.getRandomValues()
The cryptographically secure random source used to generate values.
Links last checked August 13, 2026.
Step-by-step help
Guides that use this tool
Keep working
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