Seed test fixtures
Generate IDs for mock API payloads, database records, and automated test cases.
UUID Generator
Generate one or many UUID v4 values instantly and copy them as a clean batch.
Generate UUID v4 values
Uses `crypto.randomUUID()` when available for standards-compliant random identifiers.
Generated UUIDs
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How to use this tool
A quick workflow so you can get the result you need without guesswork.
- 1
Choose how many UUID v4 values you want to generate.
- 2
Click Generate UUIDs to create a fresh list using the browser crypto API.
- 3
Copy the full batch or regenerate again until you have the amount you need.
Useful examples
Practical cases where this utility saves time and reduces mistakes.
Prototype client apps
Assign temporary unique identifiers in browser-based demos before wiring in a backend.
Manual data entry
Produce a batch of UUIDs for spreadsheets, import files, or migration prep work.
Frequently asked questions
Short answers to the most common questions about the calculator above.
What kind of UUID does this page generate?
It generates RFC 4122 compliant version 4 UUIDs using random values from the browser crypto API.
Can I generate multiple UUIDs at once?
Yes. Enter the quantity you need and the tool will create a batch you can copy in one click.
Are UUIDs generated locally?
Yes. The browser creates them locally, so the values do not need to be requested from a server.
Is a UUID the same as a database primary key?
A UUID can be used as a primary key, but whether that is appropriate depends on your database design and indexing needs.
Generate RFC 4122 UUID v4 Values in Your Browser
This online UUID generator creates version 4 UUIDs using the browser crypto API. The values are random, locally generated, and ready to paste into JSON fixtures, database seed files, spreadsheets, or test payloads.
If you need more than one, you can generate a batch in a single action and copy the output immediately. That is useful for prototyping, QA work, and any workflow where unique identifiers need to be created quickly.
Simple, Fast, and Practical for Development Work
Developers and testers often need UUIDs while working with APIs, event streams, or local data models. Opening a full REPL or IDE just to create IDs is usually unnecessary. A focused browser-based UUID generator is faster for one-off or batch generation.
Because the page uses native browser cryptography, the process is immediate and does not depend on a remote service. That keeps the tool lightweight and reliable for everyday use.
Related tools
Keep moving with other free browser-based utilities on HandyUtils.