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Result
All processing happens in your browser No data is sent to any server UUIDs never leave your browser
Free GUID / UUID Generator
Generate browser-only UUID v4 values instantly with compact format controls and bulk output.
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What is a GUID / UUID?
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.
Why Use GUIDs / UUIDs?
UUIDs solve the problem of assigning unique identifiers without a central authority — ideal for distributed systems where multiple services need to create records independently.
Databases
Primary keys that safely merge data from multiple sources without ID clashes.
REST APIs
Expose resource identifiers without revealing sequential counts or internal structure.
Distributed Systems
Generate IDs on any node without network coordination.
File Storage & Testing
Avoid filename collisions on cloud storage. Create unique test fixtures without a database.
UUID Versions Explained
Five UUID versions are defined in RFC 4122. The two you encounter most are:
UUID v1 — Time-based
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.
UUID v4 — Random (used by this tool)
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.
How This UUID Generator Works
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.
Features
Batch generation
Generate 1 to 1,000 GUIDs in a single click.
Five output formats
Standard, uppercase, no hyphens, braces, or parentheses.
One-click copy
Copy all generated UUIDs to clipboard instantly.
100% private & offline
UUIDs never leave your browser. Works offline after first load.
Frequently Asked Questions
Are GUIDs / UUIDs truly unique?
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.
What is the difference between a GUID and a UUID?
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.
Is UUID v4 safe to use as a secret token?
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.
Can I generate multiple UUIDs at once?
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.
Is this GUID generator secure and private?
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.