Free UUID Generator Tool Online
Generate RFC 4122 version 4 UUIDs in bulk, free and instantly in your browser. Copy single IDs or export a batch as a list.
IN: Quantity · OUT: UUID v4 list · RUNS: 100% in your browser
7e6179e2-c396-45e8-8c37-a958a122049b 810ca67f-e7cd-4064-b90a-7aa7b71f5e1b 5d46aa80-1223-4241-87ca-a06582bac8d0 db8230be-011e-4f08-8989-cd31b68d11a2 7b67f368-22fa-4722-bf79-d3d260f7ac1d
Frequently asked questions
What version of UUID does this generate?+
This tool generates version 4 UUIDs, which are based on random numbers and are the most common choice for database primary keys and distributed IDs.
Are the UUIDs guaranteed to be unique?+
UUID v4 has 122 random bits, so collisions are astronomically unlikely, making it globally unique for practical purposes across any number of systems generating IDs independently.
Can I generate more than one UUID at a time?+
Yes, use the quantity control to generate up to 1,000 UUIDs at once and copy or download them as a text file.
Does the generator use a secure random source?+
Yes, it uses the browser's crypto.getRandomValues API rather than Math.random for cryptographically strong randomness.
What's the difference between UUID and GUID?+
GUID (Globally Unique Identifier) is Microsoft's term for the same concept as UUID; the underlying format (128-bit identifier, typically shown as 32 hex digits with hyphens) is effectively identical.
Can I use UUIDs as database primary keys?+
Yes, UUIDs are commonly used as primary keys, especially in distributed systems where IDs need to be generated independently across multiple servers without coordination, though they take more storage than auto-incrementing integers.
Why does a UUID look like 8-4-4-4-12 hex digits?+
That grouping is defined by RFC 4122: 32 hexadecimal digits split into five groups separated by hyphens, with specific bits reserved to indicate the UUID version and variant.
Is it safe to expose UUIDs in public URLs?+
UUID v4 values are effectively unguessable due to their randomness, making them reasonably safe to use in URLs, though you should still apply proper authorization checks rather than relying on obscurity alone.