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Security & Random

UUID Generator

Generate single or batch UUID v4 values.

Your data stays on your deviceNo upload, no serverWorks offline

Why use this tool

01

Create random UUID lists directly in the browser.

UUID Generator creates random UUID v4 values with configurable batch size.

The generated values are ready to copy into code, databases, or test data.

How to use

02
01Set how many UUIDs you need.
02Generate and copy the list directly.

Quick checks before you copy

03

Confirm the input is the format you intended.

Scan the result before using it in a document, URL, config, or message.

Copy only the output you need.

Use Cases

Generate Database Primary Keys

Create UUIDs to use as primary keys in databases, ensuring uniqueness across distributed systems without a central counter.

Create Unique File Names

Generate a UUID to use as a unique file name when storing uploads, preventing collisions when multiple users upload files with the same name.

Seed Test Data

Generate batches of UUIDs to use as IDs for mock objects when writing tests or populating a development database.

Identify API Resources

Use UUIDs as resource identifiers in REST APIs to prevent enumeration attacks that sequential IDs make possible.

Tips & Tricks

  1. 01
    UUID v4 is the right choice for most use cases

    UUID v4 is randomly generated and does not encode any system information. It's the most commonly used version for database IDs and general unique identifiers.

  2. 02
    Generate multiple at once

    Use the bulk generation option to produce dozens of UUIDs at once for seeding test databases or generating API keys.

  3. 03
    UUID is case-insensitive

    UUIDs are conventionally lowercase but are case-insensitive by spec. A09E... and a09e... refer to the same UUID.

FAQ

04
Are generated UUIDs truly unique?

UUID v4 uses 122 bits of random data, making collisions astronomically unlikely. The probability of generating two identical UUIDs is lower than one in a quintillion.

Are generated UUIDs sent to a server?

No. UUIDs are generated entirely in your browser using the Web Crypto API.

What's the difference between UUID v1 and UUID v4?

UUID v1 encodes the MAC address of the generating machine and the current timestamp. UUID v4 is fully random. Use v4 for privacy and general use; v1 is rarely needed today.

Can I use a UUID as a password or secret?

UUID v4 contains 122 bits of randomness, which is sufficient for many token use cases, but it uses a standard format. For secrets, use a dedicated secret generator for higher-entropy output.

Is UUID the same as GUID?

Yes. GUID (Globally Unique Identifier) is Microsoft's term for UUID. They follow the same RFC 4122 standard.

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03
UUID Generator — Generate single or batch UUID v4… | TOOLGRID