UUID Generator
Generate unique identifiers
What Is a UUID Generator?
A UUID generator creates Universally Unique Identifiers — 128-bit strings that are guaranteed to be globally unique across all systems and databases. UUIDs are used as primary keys, session tokens, transaction IDs, and unique references in distributed systems. Tooliva's free online UUID generator creates v4 random UUIDs instantly with no sign-up required.
Why Use Tooliva's Online UUID Generator?
When building distributed applications, databases, or APIs, you need identifiers that won't collide across systems. Sequential IDs create security vulnerabilities and race conditions. UUIDs solve this by providing cryptographically random, globally unique identifiers. Tooliva generates them instantly, supports batch generation, and keeps everything private through client-side processing.
How to Generate UUIDs Online
- Choose the number of UUIDs you need — one, ten, or a hundred.
- Click Generate and the tool creates unique UUIDs instantly.
- Copy individual UUIDs or download all as a text file.
Key Features
- UUID v4 random generation — cryptographically random, globally unique identifiers
- Batch generation — generate 1 to 100 UUIDs at once
- Multiple output formats — standard, without hyphens, or uppercase
- One-click copy — copy individual UUIDs or the entire batch
- Free and private — no sign-up, no uploads, browser-based
Common Use Cases
Database architects use UUIDs as primary keys for distributed databases. API developers generate unique request and transaction IDs. Session managers use UUIDs for secure session tokens. Microservices use UUIDs for event tracking and message correlation. IoT systems use UUIDs to uniquely identify devices across global networks.
Frequently Asked Questions
Q: What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 32 hexadecimal characters separated by hyphens, like 550e8400-e29b-41d4-a716-446655440000. It is designed to be unique across all systems worldwide.
Q: Are UUIDs truly unique?
UUID v4 uses cryptographically random generation, making collisions astronomically unlikely. The probability of generating two identical UUIDs is approximately 1 in 2^122.
Q: Can UUIDs be sequential?
UUID v1 is time-based and partially sequential. This tool generates UUID v4, which is fully random. For sequential UUIDs, consider UUID v7 or database auto-increment IDs.
Q: Is the generation private?
Yes. All generation happens in your browser using the Web Crypto API. No data is sent to any server.