Generate UUIDs v1, v4, v5, ULID, NanoID and Short IDs instantly. Validate, bulk generate, and export — all in your browser.
Our free UUID generator lets you create universally unique identifiers instantly. Generate UUIDs v1, v4, v5, ULID, NanoID, Short IDs, and even MongoDB ObjectIDs — all directly in your browser. No account, no software, and no risk. Everything runs locally, ensuring complete privacy and security.
Whether you need random UUIDs for software development, time‑based IDs for sorting, or name‑based deterministic UUIDs for consistency, our tool covers every format. You can validate, bulk generate, and export IDs in multiple formats with a single click.
Unlike traditional sequential IDs, UUIDs eliminate collisions across distributed systems. This makes them ideal for modern applications where scalability, decentralization, and global uniqueness are critical. Developers, IT teams, and businesses can rely on our generator for safe, repeatable, and efficient ID creation.
A UUID generator is a tool that produces unique identifiers based on standardized algorithms. UUIDs (Universally Unique Identifiers) are 128‑bit values used in databases, applications, and distributed systems to ensure uniqueness without central coordination.
Our generator supports multiple types: UUID v4 (random), UUID v1 (time‑based), UUID v5 (name‑based), ULID (sortable), NanoID (compact), Short ID (8 chars), and ObjectID (MongoDB). Each format serves different use cases, from cryptographic randomness to lexicographic sorting.
Because everything runs locally in your browser, no ID is ever transmitted or stored externally. This makes our tool suitable for developers, IT professionals, and businesses worldwide. It ensures compliance with privacy regulations and offers peace of mind for projects where sensitive data is involved.
UUIDs are widely adopted in APIs, cloud platforms, and enterprise software. They provide a universal solution for identity management, ensuring that every record, file, or request remains unique across millions of operations.
UUIDs are essential in modern software and data systems. Here are the most popular and effective use cases:
Use UUIDs as primary keys in relational or NoSQL databases to ensure unique records without collisions.
Generate IDs across multiple servers without central coordination. UUIDs guarantee uniqueness globally.
Assign unique request IDs, session tokens, or resource identifiers in APIs and microservices.
Prevent conflicts by using UUIDs in file names, uploads, and storage systems.
Create random, unguessable identifiers for authentication, encryption, and secure sessions.
Beyond these, UUIDs are also used in IoT devices, blockchain applications, and cloud-native environments where billions of identifiers must remain unique and traceable.
Our tool supports multiple UUID formats. Here is a clear comparison to help you choose:
| Type | Features | Best Use Case |
|---|---|---|
| UUID v4 | Random, cryptographically secure | General purpose, security tokens |
| UUID v1 | Time‑based with timestamp | Sorting, logging, event tracking |
| UUID v5 | Name‑based deterministic | Consistent IDs for same input |
| ULID | Lexicographically sortable | Databases, ordered records |
| NanoID | Compact, URL‑safe | Web apps, short unique IDs |
| Short ID | 8‑character identifiers | Lightweight apps, quick IDs |
| ObjectID | MongoDB format | NoSQL databases, document IDs |
Use UUID v4 for randomness, UUID v1 for time‑based sorting, UUID v5 for deterministic IDs, and ULID when you need sortable identifiers. For compact needs, NanoID and Short ID are excellent choices.
Select UUID v4 for randomness, v1 for time‑based, and v5 for deterministic needs.
Standard UUIDs are 36 characters. Use NanoID or Short ID for compact formats.
Always validate UUIDs to ensure they conform to RFC 4122 standards.
Use bulk mode to generate hundreds of IDs for testing or database seeding.
Do not expose sensitive UUIDs in public logs or URLs where they can be harvested.
Additionally, integrate UUIDs with password managers or secure storage systems when they are tied to authentication. For developers, using UUIDs in CI/CD pipelines ensures reproducibility and avoids conflicts during automated deployments.