UUID/GUID Generator
Generate universally unique identifiers (UUIDs) for your applications
Let's make some IDs
Click the generate button in the sidebar to create universally unique identifiers for your project.
Settings
What is UUID/GUID Generator?
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. Our online UUID generator helps you create these IDs instantly for use in databases, APIs, and software testing. We support standard RFC 4122 versions, including Version 4 (random) and Version 1 (timestamp-based), so you can be sure your IDs are reliable and compliant. Best of all, everything happens right in your browser, so your data stays private.
Key Features & Benefits
Standard Compliant
Our tool generates fully compliant RFC 4122 identifiers that work across all programming languages and platforms.
Secure Randomness
We use strong random number generation for v4 UUIDs, making it virtually impossible to ever generate the same ID twice.
Batch Generation
Perfect for testing and setting up databases—generate and format a long list of unique strings in a heartbeat.
Complete Privacy
Everything happens locally on your device. Your identifiers are never sent to our servers or saved anywhere else.
How to Use the UUID/GUID Generator
Choose Your Version
Select between UUID v4 (random) or UUID v1 (timestamp-based). If you're not sure, v4 is the most common choice for general use.
Set the Count
Enter how many UUIDs you need. You can generate a single ID or a batch of up to 100 at once.
Pick Your Formatting
You can choose to make the letters uppercase or remove the hyphens to match your project's specific needs.
Generate and Copy
Click the generate button to see your list. You can copy individual IDs or save the whole batch to your clipboard with one click.
Practical Use Cases
Database Primary Keys
Use UUIDs as unique keys in databases like PostgreSQL or MongoDB to prevent identification conflicts.
Session IDs
Generate unique session or request IDs to help track interactions and debug issues across different services.
Unique Filenames
Create unique names for file uploads to avoid overwriting existing files on your server or cloud storage.
API Tokens
Quickly generate unique strings for API keys, password reset tokens, or email verification links.
FAQs
What is a UUID and what is it used for?
A UUID (Universally Unique Identifier) or GUID (Globally Unique Identifier) is a 128-bit identifier that is unique across both space and time. UUIDs are commonly used as database primary keys, session IDs, authentication tokens, file names, API request tracking IDs, and identifiers in distributed systems.
What is the difference between UUID v1 and UUID v4?
UUID v4 uses random number generation to create identifiers and is the most commonly used version for general purposes. UUID v1 is timestamp-based and includes the current time and MAC address of the generating computer, making it useful when you need time-ordered identifiers or want to trace the source.
How secure are randomly generated UUIDs?
UUID v4 uses cryptographically strong random number generation, making collisions extremely unlikely. With 122 random bits, the probability of generating duplicate UUIDs is astronomically low, making them secure for use as unique identifiers in production applications.
Can I generate multiple UUIDs at once?
Yes, this tool allows you to generate up to 100 UUIDs in a single batch. Simply specify the number of UUIDs you need, and the tool will generate them instantly. You can copy all generated UUIDs at once or copy them individually.
Does the UUID generator store or transmit my data?
No, all UUID generation happens entirely in your browser using JavaScript. No data is stored on servers or transmitted over the network. Your generated UUIDs remain completely private and secure.
What formatting options are available?
The tool offers uppercase formatting and the option to remove dashes from UUIDs. You can generate standard lowercase UUIDs with dashes (e.g., 550e8400-e29b-41d4-a716-446655440000), uppercase versions, or compact versions without dashes for different use cases.
Are the generated UUIDs truly unique?
While no system can guarantee absolute uniqueness, UUID v4 has such a large number space (2^122 possible values) that the probability of collision is negligible for practical purposes. The chance of generating duplicate UUIDs is approximately 1 in 5.3 x 10^36.
Can I use these UUIDs in production applications?
Yes, the generated UUIDs follow the RFC 4122 standard and are suitable for production use in databases, APIs, distributed systems, and any application requiring unique identifiers. They are widely supported across programming languages and platforms.