UUID Generator Online - Generate UUID v4 and GUID Values

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Example

Standard UUID v4 format

The exact value changes every time. The 4 in the third group indicates version 4 format.

Input


                        Generate 1 UUID

Output


                        550e8400-e29b-41d4-a716-446655440000

Dashless UUID format

Some systems store UUIDs without dashes, but the standard dashed form is easier to read and compare.

Input


                        Remove dashes enabled

Output


                        550e8400e29b41d4a716446655440000

Practical Notes

UUID v4 values are designed to be unique enough for most application identifiers, but they are not meant to be human-readable.
Use dashless UUIDs only when a system specifically requires that format.
Do not use UUIDs as secrets. They are identifiers, not passwords or authentication tokens.
Use UUIDs when uniqueness matters more than readability. Use slugs when humans need to read or remember the value.
Keep one UUID format per system when possible. Mixing dashed, dashless, uppercase, and lowercase values can complicate comparisons.

How to Use

1. Choose how many UUIDs to generate.
2. Select uppercase or dashless output if your system expects that format.
3. Click Generate to create new random UUIDs.
4. Copy all values and paste them into your database, code, or test data.

Features

Generates RFC 4122-style UUID v4 identifiers
Uses crypto.getRandomValues for browser-based randomness
Bulk generates up to 100 UUIDs at once
Supports uppercase output and dashless UUIDs
Copies all generated UUIDs with one click
Useful for mock IDs, database seeds, API examples, and correlation IDs
Runs locally without sending generated identifiers to a server

Use Cases

Creating test IDs for databases, APIs, and fixtures
Generating unique identifiers for demos and local development
Preparing mock data for documentation or sample payloads
Creating temporary correlation IDs for logs and debugging
Preparing sample UUID values for API documentation and JSON fixtures
Generating dashless identifiers for systems that require compact UUID strings

Frequently Asked Questions

What is a UUID v4?

A UUID v4 is a randomly generated identifier with a standard 8-4-4-4-12 hexadecimal structure.

Are UUIDs guaranteed to be unique?

UUID v4 values are not mathematically guaranteed, but the random space is large enough that collisions are extremely unlikely in normal applications.

Can I use UUIDs as passwords?

No. UUIDs are identifiers. Use a password generator or secure token generator for secrets.

Are generated UUIDs stored?

No. UUID generation happens locally in your browser after the page loads. QuickToolFlow does not store generated identifiers.

Is a UUID the same as a GUID?

In many everyday development contexts, UUID and GUID refer to the same style of 128-bit identifier. Some platforms use GUID terminology, while RFC-style documentation usually says UUID.

Should I use UUIDs in public URLs?

UUIDs can work in public URLs when you need opaque identifiers, but readable slugs are often better for content pages. Do not treat UUIDs as access control or secrets.