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Utilnivo

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Utilnivo

UUID v1 Generator

Generate UUID version 1 time-based identifiers when sortable IDs matter.

No registration
  • On your device

Browse more in Developer or all tools.

What is a UUID generator?

A UUID generator creates random unique identifiers (v4) for databases, APIs, and test data. IDs are generated locally in your browser.

Private on your device

Your information stays on your device and is not uploaded.

Related tools

This UUID v1 generator creates time-based RFC 4122 version 1 identifiers embedding timestamp and node components. Use when you need roughly time-ordered IDs for logs or legacy systems—prefer v4 for pure randomness or v7 for modern sortable IDs.

UUID v1 includes timestamp information—IDs sort roughly by creation time but may expose clock details.

Privacy-sensitive apps often prefer random v4 or sortable v7 over v1 node-based patterns.

How to use this tool

Select version 1 if offered on the base tool, generate UUIDs, and copy for your application or database seed.

Worked example

Example: generate v1 UUIDs for a legacy Java service that expects time-ordered keys in an audit log table.

When to use this

  • Integrating with systems that require UUID v1 specifically.
  • Rough time ordering without a separate created_at column in prototypes.
  • Teaching UUID version differences in backend courses.

Common examples

  • Generate v4 UUID for a new database primary key in local seed scripts.
  • Batch of five UUIDs for mock API fixtures in integration tests.
  • UUID for trace id in log correlation examples in documentation.
  • Ten UUID v4 values → seed rows for local integration test database.
  • UUID v7 batch → ordered IDs for event-sourcing demo data.

Common mistakes

  • Choosing v1 for security-sensitive opaque tokens.
  • Assuming v1 guarantees strict monotonic sort across machines.
  • Using v1 when database B-tree performance needs UUID v7 instead.

How it works

Generates UUID v4 (random) or v7 (time-ordered) identifiers using crypto-random bytes on your device. Supports bulk generation with optional uppercase and hyphen formatting.

Limitations

Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.

Privacy and file handling

Your data stays on your device and is not uploaded.

Related UUID Generator pages

These pages use the same uuid generator with examples tailored to different tasks.

FAQ

Frequently asked questions

What is the difference between v1 and v4?

v1 is time-based with node bits; v4 is fully random.

Are v1 UUIDs unique across servers?

Designed to be unique when clock and node are configured correctly—still use proper generation libraries in prod.

Should new apps use v1?

Many teams prefer v4 for privacy or v7 for sortable IDs—match your platform requirements.

Related pages

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