Bulk UUID v4 Generator

Generate up to 1000 cryptographically random UUIDs at once — copy or download

Generate UUIDs in Bulk

A UUID v4 is a randomly generated 128-bit identifier written as 36 characters (32 hex digits plus 4 hyphens), like f47ac10b-58cc-4372-a567-0e02b2c3d479. This generator creates 1 to 1000 UUIDs in one click using your browser's cryptographically secure random source, with options for UPPERCASE output and hyphen removal. Copy the whole list or download it as a .txt file.

Developers use bulk UUIDs for seeding databases with test data, pre-generating primary keys, creating API keys and correlation IDs, naming uploaded files, and populating fixtures before a system can generate its own. Getting a thousand at once saves writing a throwaway script every time.

Can UUIDs collide?

Version 4 UUIDs contain 122 random bits, giving about 5.3 × 1036 possible values. You would need to generate a billion UUIDs per second for roughly 85 years to reach even a 50% chance of one duplicate — collisions are a theoretical, not practical, concern. Generation happens entirely in your browser; the IDs are yours alone and are never transmitted anywhere.

Frequently Asked Questions

A randomly generated universally unique identifier — 128 bits shown as 36 characters. The “4” in the third group marks the version; the rest is cryptographically random.
Up to 1000 per click. Need more? Click again — each batch is independent and instant, and you can download each batch as a .txt file.
In theory yes, in practice no — with 122 random bits, the probability of a collision is so small that UUIDs are treated as unique in all real-world systems.
Some databases and legacy systems store UUIDs as 32-character hex strings without hyphens, and some style guides require uppercase. The options format the output to match your system's convention.

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