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Free UUID Generator

Generate random UUID v4 identifiers instantly, one at a time or in bulk.

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Generated using crypto.randomUUID() - cryptographically secure, runs entirely in your browser.

About this tool

A UUID (Universally Unique Identifier) is a 128-bit identifier that is, for all practical purposes, guaranteed to be unique across space and time. The standard format is 32 hexadecimal characters displayed in five groups separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. This tool generates UUID version 4 (UUID v4), which is randomly generated using the browser's cryptographic random number generator (crypto.randomUUID). This means the UUIDs are cryptographically secure and suitable for use as database primary keys, session tokens, file names, API keys, and any other context where you need a unique identifier. You can generate up to 100 UUIDs at once in bulk mode, and customize the output format - uppercase, no hyphens, or wrapped in curly braces for use in different programming languages and database systems.

How to use

Step 1: Set the Quantity to how many UUIDs you need (1 to 100).
Step 2: Choose formatting options: Uppercase, No Hyphens, or Curly Braces.
Step 3: Click Generate to create your UUIDs instantly.
Step 4: Click the Copy button next to any UUID to copy it individually.
Step 5: Click Copy All to copy all generated UUIDs to your clipboard at once, one per line.

Frequently Asked Questions

UUID stands for Universally Unique Identifier. It is a 128-bit value used to uniquely identify information in computer systems. The probability of generating a duplicate UUID v4 is astronomically low - roughly 1 in 5.3 x 10^36.

UUID v1 is generated using the current timestamp and the MAC address of the machine, making it traceable. UUID v4 is randomly generated, providing no information about when or where it was created - making it better for privacy and security.

GUID (Globally Unique Identifier) is Microsoft's term for UUID. They are functionally identical - a GUID is simply a UUID using Microsoft's naming convention. The format is the same.

Yes. UUID v4 keys are excellent for distributed systems because they can be generated without a central authority. However, they are larger than auto-increment integers (16 bytes vs 4 bytes), which can affect index performance in very large tables.

Yes. This tool supports generating up to 100 UUIDs at a time. Set the quantity, click Generate, then use the Copy All button to get all UUIDs at once, one per line.

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