UUID Generator
Generate UUID v4 and other UUID versions
About the UUID Generator
Unique identifiers are the quiet backbone of modern software — primary keys, request IDs, file names that must never collide. The UUID Generator produces version 4 UUIDs, the random variety, as many as you need at once.
Developers grab them constantly: seeding a database with test records, generating a correlation ID to trace a request through logs, or creating a unique key for a new resource without round-tripping to a server. Because UUID v4 is built from random data, two generated values colliding is astronomically unlikely, which is exactly why it is the default choice for distributed systems.
Need one or need a hundred — set the count and generate them in a single batch, then copy them all or download them as a file.
How to Use the UUID Generator
- Set the "Count" field to how many UUIDs you need (1 to 100).
- Click Generate.
- Read the list of version 4 UUIDs.
- Use an individual copy button for a single value, "Copy All" to grab the whole list, or Download to save them as uuids.txt.
Why Use ToolForge’s UUID Generator
- It uses the browser's built-in crypto.randomUUID where available, so the values come from a cryptographically strong random source rather than a weak pseudo-random one, with a safe fallback for older browsers.
- You can generate up to 100 at once and export them with Copy All or as a downloadable text file — useful for seeding data in bulk.
- Generation is instant and local; no value is requested from or recorded by any server.
- It is free with no sign-up, so it fits straight into a scripting or testing workflow.
Frequently Asked Questions
What is a version 4 UUID?
A version 4 UUID is a 128-bit identifier generated mostly from random numbers, written as 32 hexadecimal digits in five hyphen-separated groups. The "4" appears in a fixed position to mark the version. It is the most common UUID type because it needs no central coordination to stay unique.
Are these UUIDs guaranteed to be unique?
Not literally guaranteed, but the probability of a collision is so vanishingly small that it is treated as unique for practical purposes. With 122 random bits, you would need to generate billions of UUIDs before a collision became remotely likely.
Are the generated UUIDs random and private?
Yes. They are generated in your browser using a cryptographically secure random source where available, and no value is sent to or stored on any server, so the UUIDs you create are yours alone.
Can I generate other UUID versions like v1 or v7?
This tool generates version 4 (random) UUIDs, which suit the large majority of use cases. Time-ordered versions like v1 or v7 are not produced here; if you specifically need sortable, timestamp-based identifiers, use a library that supports those versions.
