UUID & API Key Generator
Generate cryptographically random version 4 UUIDs and secure API keys in bulk. Choose how many you need and copy them with one click.
About this tool
A UUID (Universally Unique Identifier) is a 128-bit value used to label things — database rows, events, files, sessions — with practically no chance of collision, even across different systems that never coordinate. This generator produces version 4 UUIDs (random) using your browser's cryptographic random number generator, plus optional random API keys for secrets and tokens.
Why version 4 UUIDs?
Version 4 UUIDs are built almost entirely from random bits, so they reveal nothing about when or where they were created and require no central authority. The odds of generating the same v4 UUID twice are vanishingly small, which is why they are the default choice for distributed systems.
Generating secure API keys
API keys here are produced from crypto.getRandomValues — the same cryptographically secure source — so they are suitable as real secrets. Generate them in bulk when seeding environments or issuing credentials, and store them securely; a leaked key is as good as a password.
Frequently asked questions
A UUID is a 128-bit universally unique identifier used to label data without coordination between systems. Written as 32 hex digits in five groups (8-4-4-4-12), it is extremely unlikely to ever collide with another UUID.
Yes. Version 4 UUIDs here are generated from the browser's crypto random source (crypto.randomUUID / crypto.getRandomValues), not a predictable pseudo-random function.
Yes — they come from a cryptographically secure random source. Treat them like passwords: transmit them over HTTPS, store only hashes where possible, and rotate them if exposed.
The probability is negligible. A version 4 UUID has 122 random bits, so you would need to generate billions of UUIDs before a collision became remotely likely.