Generate cryptographically secure GUID (UUID v4) values instantly — free, no signup, and 100% in your browser. A GUID and a UUID are the same thing; GUID is simply Microsoft's name for the RFC 4122 UUID standard.
Enter a number between 1 and 1000
No data is sent to any server. 100% client-side — your UUIDs never leave your browser.
A GUID (Globally Unique Identifier) and a UUID (Universally Unique Identifier) refer to the same concept — a 128-bit value used to identify information uniquely across all computers and all time. The standard is defined in RFC 4122, and GUID is simply Microsoft's marketing name for the same thing.
A UUID looks like this: 550e8400-e29b-41d4-a716-446655440000. It consists of 32 hexadecimal digits in five hyphen-separated groups. With 2128 possible values — roughly 340 undecillion — the chance of two randomly generated UUIDs colliding is astronomically small and safely ignored in all real-world applications.
UUIDs solve the problem of assigning unique identifiers without a central authority — ideal for distributed systems where multiple services need to create records independently.
Five UUID versions are defined in RFC 4122. The two you encounter most are:
Built from the current timestamp and the MAC address of the generating machine. Encodes when and where it was created — a potential privacy concern in sensitive applications.
Generated entirely from cryptographically secure random numbers. Contains no traceable information and is the most widely adopted version for general-purpose unique identifiers in modern applications.
This free GUID generator runs entirely in your browser using the crypto.randomUUID() Web API — part of the W3C Web Cryptography standard. Every UUID is generated locally on your device using a CSPRNG (cryptographically secure pseudo-random number generator). Nothing is sent to any server, and no data is stored or logged.
Generation is instant for any count up to 1,000 because all processing runs on your CPU. The tool also works offline once the page has loaded.
Yes, for all practical purposes. UUID v4 has 122 random bits, producing 5.3 × 1036 possible values. Even generating millions of UUIDs per second across thousands of systems, the probability of a collision remains negligibly small and can be safely ignored.
There is no technical difference. GUID is Microsoft's term for the same 128-bit identifier format defined in RFC 4122 as a UUID. Both terms are used interchangeably — a GUID is a UUID.
UUID v4 is cryptographically random, but it was not designed to be a secret. For authentication tokens, API keys, or session tokens, use a dedicated token generation library. UUIDs are ideal as public identifiers — not as secrets.
Yes. Set the count field to any number between 1 and 1,000 and click Generate. All UUIDs are produced instantly and displayed one per line, ready to copy as a batch.
Completely. Generation uses your browser's native crypto.randomUUID() API. No data is transmitted to any server, and no analytics or logs are collected for the generated values.
