UUID v3 Generator

Quickly generate RFC 4122-compliant version 3 UUIDs online

UUID version 3 creates the same, consistent UUID for a given namespace and name input by hashing these values with MD5. This method is perfect for generating reproducible and predictable identifiers, making it ideal for usernames, resource slugs, URL paths, and seamless data integration across different systems. Please note: v3 uses MD5, which is less secure than the newer SHA-1 algorithm found in UUID v5.

Generate UUID v3 in Bulk

Namespace UUID:

Names (one per line, up to 10,000)

Output Format:

Separator:

UUID Validation Tool

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What is a UUID v3?

A UUID version 3 is a 128-bit identifier that produces deterministic—always the same—UUIDs by hashing a namespace UUID together with a name using the MD5 hashing function. It’s ideal when you require stable and repeatable identifiers across multiple environments.

UUID v3 Structure and Format

Bit Size: 128 bits (16 bytes)
Format: 8-4-4-4-12 hexadecimal digits
Example: 3b241101-e2bb-4255-8caf-4136c566a962
Total Characters: 36 (with hyphens)
Version Digit: Third group begins with '3' for version 3 UUID
Variant Bits: Fourth group encodes reserved UUID variant bits

UUID v3 Example Explained

Here’s a breakdown of example UUID v3: 3b241101-e2bb-4255-8caf-4136c566a962

3b241101 – Initial segment from MD5 hash
e2bb – Middle segment of the MD5 hash
4255 – Includes the version 3 flag
8caf – Contains variant and reserved bits
4136c566a962 – Final sequence from the MD5 output

Why Choose UUID v3?

Generates consistent, repeatable UUIDs from the same namespace/name input
Perfect for creating fixed identifiers like usernames or slugs
No necessity for random number generation or external coordination
Works offline—no server or network interaction needed

Common UUID v3 Use Cases

Generating stable IDs for usernames or email addresses
Ensuring consistent database record UUIDs across stages
Building predictable URLs or file paths based on names
Seamless legacy system integration with standardized IDs
Creating unique, repeatable slugs from a name/namespace pair

Security Considerations

UUID v3 relies on the MD5 hash algorithm, which is fast but no longer considered secure for cryptographic purposes. While suitable for general identifier generation, avoid it for secure or sensitive hashing requirements.