Online UUID Generator
Generate UUIDs and GUIDs instantly. Create random UUID v4 / GUID values for apps, databases, APIs, and testing.
Batch & Format Controls
Online UUID Generator Tool
Use this online UUID generator to create UUID v4 values instantly. Click Generate to get a new random UUID you can copy and use in your project. This uuid generator online supports bulk UUID generation, so you can generate multiple IDs at once for faster workflows.
Understanding UUIDs
A UUID (Universally Unique Identifier) is a 128-bit value used to identify data uniquely across systems. It works like a unique ID for records, requests, sessions, and objects. A UUID is designed to stay unique without relying on a central server.
UUID v4 (Random UUID)
This tool is a UUID v4 generator, which means the UUIDs are created using randomness. If you need to generate random UUID values quickly, UUID v4 is the standard option used in most modern applications.
Other UUID Versions
Version 1 UUIDs
These time-based identifiers use the current timestamp and the device's MAC address. While useful for sequencing, they've become less common due to privacy concerns and potential data exposure.
Version 3/5 UUIDs
Namespace-based identifiers that generate consistent UUIDs from input strings. Version 3 uses MD5 hashing, while Version 5 employs more secure SHA-1 hashing for deterministic UUID generation.
Version 2 UUIDs
DCE security identifiers that extend Version 1 with additional security information. Rarely used today, they primarily serve legacy systems with specific distributed computing requirements.
How to Use an Online UUID Generator?
This tool is built for fast unique id generation with clean uuid random output.
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Single UUID: Click "Generate" for one identifier
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Multiple UUIDs: Select quantity (1-1000) and click "Generate Batch"
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Format Options: Toggle between hyphenated, braces and compact formats
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Export: Copy directly or download as text file
What Can You Use a Random UUID For?
UUIDs provide reliable uniqueness for various development scenarios.
Database Keys
As a primary key in distributed databases.
File & Object Names
To avoid naming conflicts in storage systems.
Testing & Mock Data
Populating development environments with unique IDs.
Tracking Unique Entities
In logs, requests, or user analytics.
Learn & Understand
This tool generates Version 4 UUIDs using cryptographically secure random number generation in your browser. All processing happens locally with no data sent to our servers.
Most programming languages have built-in UUID libraries: crypto.randomUUID() in JavaScript, uuid.uuid4() in Python, Guid.NewGuid() in C#, and java.util.UUID.randomUUID() in Java.
Version 4 UUIDs cannot be sorted as they're random. Version 1 UUIDs contain timestamps and can be roughly sorted chronologically.
While UUIDs are unique, they should never be used alone for authentication or session tokens. UUIDs can be predictable or brute-forced if not properly secured. For authentication, use dedicated, cryptographically-secure tokens (like JWTs with signatures) or opaque session IDs stored server-side with proper expiration, randomness, and security controls.
Trust is important in security. If you prefer not to use a UI, you can generate an identical cryptographically secure UUID v4 locally in your own browser. Just open your browser console (F12) and type: `crypto.randomUUID()`. This tool uses that exact same internal browser API.
