UUID & Token Generator
Generate v4 UUIDs in bulk and secure random tokens with custom length and character sets.
Generated token appears here.About the UUID & Token Generator
This tool generates version 4 UUIDs and secure random tokens directly in your browser using the Web Crypto API, the same cryptographically strong random source used for keys and session identifiers. Nothing is generated on a server, which means no one else ever sees the values, and there is no rate limit.
A v4 UUID is a 128 bit identifier with 122 bits of randomness, formatted as five groups of hexadecimal characters. The chance of two independently generated v4 UUIDs colliding is so small that systems all over the world treat them as unique without coordination. Use them as database keys, request identifiers, file names, or anywhere you need an identifier that no other system will accidentally produce.
The token generator produces random strings for API keys, temporary passwords, webhook secrets, and similar uses. You control the length and which character sets are included. Tokens are generated with rejection sampling, so every character in your chosen set has an equal chance of appearing; there is no modulo bias weakening the result.
For passwords, longer is better than more complex. A 24 character token from letters and digits is far stronger than an 8 character token with symbols. If a site limits symbols, increase the length instead.
Reach developers and designers who use these tools every day. Privacy-first, no trackers.
Frequently asked questions
Are these UUIDs really unique?
A v4 UUID contains 122 random bits, which gives about 5.3 undecillion possible values. The probability of generating a duplicate is negligible in practice. You would need to generate roughly a billion UUIDs per second for decades before a collision becomes likely.
Are the tokens safe to use as passwords or API keys?
Yes. Tokens are generated with crypto.getRandomValues, the cryptographically secure random source in your browser, with rejection sampling to keep every character equally likely. They are generated locally and never transmitted, logged, or stored.
What is the difference between UUID v4 and other versions?
v4 is purely random. v1 and v6 embed a timestamp and originally a MAC address, v5 derives the value from a name and namespace using hashing, and v7 combines a timestamp with randomness for sortable identifiers. v4 is the right default when you simply need a unique identifier.
Can I generate UUIDs in bulk?
Yes, up to 100 at a time. Each one can be copied individually, or use the copy button at the top of the panel to copy the whole list with one UUID per line.
Does this tool store or send the generated values anywhere?
No. Generation happens in your browser with the Web Crypto API. The values exist only on your screen and in your clipboard after you copy them.