- Generated UUIDs will appear here...
Free Online UUID v4 Generator
Our secure UUID Generator tool allows you to instantly generate universally unique identifiers (UUIDs) natively in your browser. Utilizing the modern Web Crypto API, it ensures cryptographic randomness for version 4 (v4) UUIDs, making them ideal for database primary keys, session tokens, and unique tracking IDs.
Features of the UUID Generator
- 100% Local & Secure: All UUIDs are generated locally on your device. No data is sent to our servers.
- Multiple Variants: Generate standard UUID v4 (randomly generated), UUID v1 (time-based), or UUID v7 (time-ordered).
- Bulk Generation: Generate hundreds of UUIDs at once. You can export the bulk results using comma, space, newline, or as a JSON array.
- One-Click Copy: Effortlessly copy a single UUID or the entire batch to your clipboard with a single click.
Frequently Asked Questions
What is the difference between UUID v4, v1, and v7?
UUID v4 is randomly generated — ideal for most uses because it has no predictable structure. UUID v1 is time-based and includes a timestamp and MAC address, which can expose information about when and where it was generated. UUID v7 is a newer time-ordered format that sorts chronologically, making it more database-friendly than v4 while still being harder to predict than v1.
Can two generated UUIDs ever be the same?
Theoretically yes, but practically no. UUID v4 has 122 random bits, meaning there are 5.3 × 10^36 possible values. Generating a duplicate is so unlikely it's treated as impossible in any real-world application.
Are these UUIDs cryptographically secure?
Yes. This tool uses the Web Crypto API (crypto.getRandomValues), which is cryptographically secure random number generation — the same source used by browsers for TLS. These UUIDs are safe to use as session tokens or secret identifiers.
What is a GUID and is it the same as a UUID?
GUID (Globally Unique Identifier) is Microsoft's name for UUID. They are the same format. A GUID generated here is valid as a UUID anywhere and vice versa.
Does this tool send my UUIDs to a server?
No. All UUIDs are generated entirely in your browser using JavaScript and the Web Crypto API. Nothing is transmitted or stored.