UUID Generator
Generate UUID v4 identifiers, single or in bulk.
How to Use the UUID Generator
Click "Generate" to create one or more random UUID v4 identifiers. Set the count to generate up to 100 UUIDs at once. Toggle uppercase if needed. Click "Copy all" to copy to clipboard.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is practically guaranteed to be unique. UUID v4 uses random numbers and is the most common version used in software development for database primary keys, session tokens, and API identifiers.
Frequently Asked Questions
What is the format of a UUID?
A UUID v4 looks like this: 550e8400-e29b-41d4-a716-446655440000. It is 36 characters long with 32 hexadecimal digits and 4 hyphens.
Are UUIDs truly unique?
UUID v4 uses 122 random bits, giving roughly 5.3 x 10^36 possible values. The probability of generating a duplicate is astronomically small.
What is the difference between UUID and GUID?
UUID and GUID are the same thing. GUID (Globally Unique Identifier) is the term Microsoft uses for UUIDs.
Is this generated on the server?
No. UUIDs are generated in your browser using the Web Crypto API (crypto.randomUUID). Nothing is sent to any server.
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