Online UUID v5 Generator
Create deterministic UUIDs using SHA-1 hashing. Use our free UUID v5 generator to generate consistent, name-based unique IDs in your browser instantly.
About UUID v5 Generator
The UUID v5 Generator creates deterministic, name-based universally unique identifiers using SHA-1 cryptographic hashing. Unlike random UUIDs, such as version 4, a version-5 UUID produces the exact same 128-bit identifier whenever you provide the same namespace identifier and input string.
This tool is designed for software developers, database administrators, and system architects who need repeatable unique IDs across distributed environments. Because generation runs entirely in your web browser, your input strings and namespace keys remain private and secure on your local device.
Key features
- Standard-compliant SHA-1 hashing algorithm
- Predefined standard namespaces for DNS, URL, OID, and X.500
- Support for custom namespace UUID inputs
- Deterministic output ensures consistent ID generation
- Client-side processing keeps your data private
- One-click copy to clipboard functionality
How to use UUID v5 Generator
- Select a standard namespace (DNS, URL, OID, X.500) or enter a custom namespace UUID.
- Enter the input string or value to hash.
- Click the generate button to compute the UUID v5.
- Copy the generated unique identifier to your clipboard.
Who is it for?
- Database engineers migrating legacy data to consistent, collision-resistant primary keys.
- API developers generating repeatable resource identifiers from stable URLs or domain names.
- Distributed systems requiring synchronized object IDs without centralized coordination.
- Data pipelines needing to deduplicate incoming records based on fixed string attributes.
Frequently asked questions
What is a UUID v5?
A UUID v5 is a 128-bit universally unique identifier created by hashing a namespace identifier and a name string using SHA-1. It is deterministic, meaning identical inputs always produce the exact same UUID.
What is the difference between UUID v3, v4, and v5?
UUID v4 is generated completely randomly, whereas UUID v3 and v5 are deterministic name-based identifiers. UUID v3 uses MD5 hashing, while UUID v5 uses the stronger SHA-1 cryptographic hash algorithm.
Can I reverse a UUID v5 back to the original string?
No. UUID v5 uses SHA-1, which is a one-way cryptographic hash function. You cannot decrypt or reverse a generated UUID to discover the original namespace or input name.
Are standard namespace UUIDs required?
No. You can use predefined RFC 4122 namespaces like DNS, URL, OID, or X.500, or you can provide any valid 128-bit UUID as your own custom namespace.
Does Doffl store the data I input into the UUID v5 generator?
No. The UUID v5 generation runs entirely client-side inside your browser, so your namespaces, strings, and generated IDs are never transmitted to or stored on our servers.