UUID Generator
Developer ToolsGenerate UUID v4 identifiers
Click Generate to create UUIDs...
Nil UUID
00000000-0000-0000-0000-000000000000Max UUID
ffffffff-ffff-ffff-ffff-ffffffffffffAbout UUID Generator
Generate UUID v4 identifiers instantly. Supports bulk generation, format options, and UUID validation. Perfect for developers and database work.
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Frequently Asked Questions
What is a UUID v4 and how is it different from a GUID?
A UUID v4 is a 128-bit universally unique identifier generated from cryptographically random numbers. GUID (Globally Unique Identifier) is Microsoft's term for the same concept. Both follow the xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx format and are functionally identical.
Are these UUIDs cryptographically secure and unique?
Yes. This tool uses the Web Crypto API (crypto.randomUUID()) to produce cryptographically strong random values. The probability of generating a duplicate UUID v4 is astronomically small, making them safe for database primary keys, API tokens, and distributed system identifiers.
How do I bulk generate multiple UUIDs at once?
Set the count slider to generate between 1 and 100 UUIDs in a single click. Choose your preferred format (lowercase, uppercase, or no hyphens) and all identifiers are created instantly. Copy the entire list to your clipboard with one button.
Is my data safe when generating UUIDs here?
Yes. All UUID generation happens entirely in your browser using the native Web Crypto API. Nothing is sent to any server. The tool works offline once loaded, making it completely private.
How do I validate whether a string is a valid UUID v4?
Paste any string into the validator section and the tool checks its format against the UUID v4 specification. It verifies the length, hyphen positions, the version digit (4), and the variant bits to confirm whether the string is a properly formatted UUID.
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