UUID Generator - Generate Unique Identifiers Online
Generate UUID v4 and v1 identifiers with batch support
About UUIDs
UUID v4: Random-based identifiers (most common). Perfect for most use cases.
UUID v1: Time-based identifiers with MAC address. Useful for sequence tracking.
Each UUID is globally unique with extremely high probability (~340 trillion trillion combinations).
About this tool
A free online UUID generator that creates unique identifiers for your applications and databases. UUIDs (Universally Unique Identifiers) are 128-bit numbers represented as 36-character strings that are virtually guaranteed to be globally unique. They're essential in modern software development for database primary keys, session tokens, request IDs, and anywhere you need a unique identifier.
Our tool supports two UUID versions: UUID v4 (random) and UUID v1 (timestamp-based). UUID v4 is the most common, generating completely random identifiers perfect for most use cases. UUID v1 is timestamp-based, making it useful when you need sequence tracking or ordering by generation time.
The tool supports batch generation—generate 1 to 100 UUIDs at once with a single click. Each UUID is independently generated with the selected version. Copy individual UUIDs or copy all generated identifiers at once for bulk import into your application or database.
How to use this tool
Choose UUID version
Select UUID v4 (random, most common) or UUID v1 (timestamp-based, sortable by creation time).
Set count
Enter how many UUIDs to generate (1-100). You can generate single UUIDs or batch up to 100 at once.
Click Generate
Instantly generate your UUIDs. The tool creates new identifiers without contacting any server.
Copy and use
Copy individual UUIDs or use "Copy All" for batch imports. Paste them into your database, code, or configuration files.
Frequently Asked Questions
What is a UUID and why do I need it?
A UUID (Universally Unique Identifier) is a 128-bit number that's virtually guaranteed to be globally unique. Instead of relying on databases to auto-increment IDs, UUIDs let you generate unique IDs anywhere in your application. They're essential for distributed systems, databases, APIs, and any system that needs collision-free unique identifiers.
What's the difference between UUID v4 and UUID v1?
UUID v4 is random-based, using completely random data for uniqueness. UUID v1 is timestamp-based, using your computer's MAC address and current time. UUID v4 is more common and secure. UUID v1 is useful when you want UUIDs to be sortable by creation time.
Are UUIDs truly unique or just probably unique?
UUIDs are "virtually guaranteed" unique. With 2^128 possible values, the probability of collision is astronomically low. For practical purposes in any single application, you can treat them as guaranteed unique. Across billions of UUIDs, collisions remain statistically impossible.
Can I use UUIDs as database primary keys?
Yes! UUIDs are commonly used as primary keys in databases, especially in distributed systems. They avoid auto-increment ID coordination issues. However, they're larger than integers (36 chars vs 11 chars), so they use more storage. For most applications, the uniqueness guarantee is worth the trade-off.
How do I import generated UUIDs into my application?
Copy the UUIDs using the copy button and paste them where needed. For batch imports, use "Copy All" to get all UUIDs separated by newlines, then paste into your database or application code. Many databases support direct UUID import from tab or newline-delimited lists.