UUID Generator
Generate random UUID v4 (GUID) values in bulk — up to 500 at once — with options for uppercase and no hyphens. Values come from your browser's cryptographically secure random source and are generated entirely locally.
How to use
- Enter the number of UUIDs you need (1–500). Five are generated by default.
- Tick the options you want: uppercase letters, removing hyphens, or showing how long generation took.
- Click "Generate UUIDs" and the values appear one per line in the output area below.
- Click "Copy all" to put the whole batch on your clipboard, or "Clear" to remove the current result.
FAQ
What is a UUID and is it the same as a GUID?
A UUID (Universally Unique Identifier) is a 128-bit globally unique identifier, normally written as a 36-character hex string grouped 8-4-4-4-12. GUID is Microsoft's name for the same standard — the two are interchangeable.
Why does this tool generate UUID v4?
Version 4 UUIDs are built entirely from random numbers: there is no registry to consult and no timestamp leakage, which makes them ideal for API testing, database primary keys, session identifiers and most other use cases. This tool uses the browser's cryptographically secure random source.
Does removing hyphens affect uniqueness?
No. Hyphens are only readability separators. Removing them yields a 32-character hex string with the same information content and the same uniqueness — commonly used for database keys or file names.
Are the generated values uploaded or stored anywhere?
No. All UUIDs are generated locally in your browser. They never touch a server and are never saved or logged.