Free Online UUID Generator

Generate, validate, and decode Universally Unique Identifiers with our suite of developer tools. All tools are free, work in your browser, and don't require registration.

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Get UUID

Generate UUIDs in multiple versions (v1, v4, v7) with customizable formatting options and bulk generation.

UUID Validator

Verify if a string is a valid UUID according to RFC 4122, and analyze its version and variant.

UUID Decoder

Extract and analyze components from UUIDs, including timestamps from time-based UUIDs.

Versions

Learn about the different UUID versions, their specifications, and use cases.

Base64 Encoder/Decoder

Convert between regular text and Base64 encoding, with special handling for UUIDs.

Minecraft UUID

Look up Minecraft player UUIDs by username and convert between UUID formats used in Minecraft.

About UUID

UUIDs (Universally Unique Identifiers) are 128-bit values designed to be unique across space and time. They're essential for many programming and database tasks where you need identifiers that are guaranteed to be unique across different systems.

Our free online tools help developers work with UUIDs more efficiently. Whether you need to generate random UUIDs, validate existing ones, decode their internal structure, or convert between different formats, our suite of tools has you covered.

All tools work directly in your browser - no data is sent to any server, and no registration is required.

Essential Online UUID for Developers

Our collection of Online UUID provides developers with everything they need to work with Universally Unique Identifiers. These 128-bit identifiers, as specified in RFC 4122, serve as crucial components in numerous software applications, databases, and distributed systems.

What Are UUIDs?

Universally Unique Identifiers (UUIDs) are 128-bit values designed to be unique across space and time. The standard format consists of 32 hexadecimal digits displayed in 5 groups separated by hyphens: 8-4-4-4-12. For example: 123e4567-e89b-12d3-a456-426614174000.

UUIDs solve the problem of creating unique identifiers without requiring a central coordination mechanism. They're particularly useful in distributed systems, databases, and any application where uniqueness needs to be guaranteed without communication between different parts of the system.

UUID Versions and Their Applications

Different UUID versions serve different purposes:

Version 1 (Time-based): Generated using the current timestamp and MAC address. Useful for chronological sorting.
Version 3 (MD5 hash-based): Created by hashing a namespace identifier and name.
Version 4 (Random): Generated using random or pseudo-random numbers. The most commonly used type for general-purpose unique identifiers.
Version 5 (SHA-1 hash-based): Similar to version 3 but uses SHA-1 hashing instead of MD5.
Version 7 (Time-ordered): Uses Unix timestamp with random data for better database performance.