Introduction
This UUID Generator helps you create UUID v1, v4, v6, and v7 values directly in the browser. It is useful for developers who need identifiers for databases, test fixtures, imports, event payloads, logs, queues, or internal tools, and it supports fast switching between UUID versions without leaving the page.
How to Use
Choose the UUID version you want first, then enter how many identifiers you need in the batch. Generate the result, review the list, and either copy all values or download them as a plain text file. The output stays in canonical lowercase UUID format with hyphens, which makes it easy to paste into code, CSV preprocessing steps, documentation, and seed scripts.
Features
- •Supports UUID v1, v4, v6, and v7 in one local browser tool
- •Fast version switching for comparing legacy, random, and sortable UUID formats
- •Bulk generation for test data, migrations, and import preparation
- •Copy-all output and TXT download for quick reuse in developer workflows
- •Local browser processing with no server upload
Which UUID Version Should You Use?
UUID v4 is still a common default when you only need a random identifier. UUID v1 and v6 are time-based formats, which can be useful when ordering matters or when you work with older systems that already expect timestamp-oriented identifiers. UUID v7 is a newer option that combines Unix time ordering with random trailing bits, which makes it attractive for modern databases and event streams.
When Bulk Generation Helps
Bulk UUID output is useful when you want to prefill fixture files, build seed data, reserve identifiers before an import, or prepare multiple references for test cases. It can also help when you need a fast batch of sample values for demos, integration tests, or migration dry runs.
Local Processing and Privacy
The generator runs locally in your browser, so the UUID values are not uploaded to a remote API. That makes it convenient for day-to-day development work and for projects where you do not want temporary identifiers to leave your environment. You should still treat generated values as ordinary identifiers rather than secrets, because UUIDs are usually designed for uniqueness, not for access control.
Output Format Notes
The tool returns canonical UUID strings with hyphens and lowercase hex characters. This format is the safest default for most codebases, logs, and import pipelines because it matches the representation most developers expect when reading, copying, or validating UUIDs.
UUID Version Guide
Use this table to choose the version that best fits your workflow.
| Version | Generation style | Typical use |
|---|---|---|
| v1 | Time-based with clock sequence and node fields | Legacy systems, timestamp-oriented workflows, compatibility checks |
| v4 | Random | General-purpose identifiers when ordering is not important |
| v6 | Reordered time-based | Databases and logs that benefit from sortable legacy-style UUIDs |
| v7 | Unix time plus random bits | Modern systems that want sortable identifiers with a simpler time model |
Bulk Output Workflow
Bulk UUID generation is often part of a larger developer task.
| Task | Why bulk output helps | Practical note |
|---|---|---|
| Seed data | Create many identifiers at once | Useful before populating local or staging datasets |
| Imports | Prepare keys in advance | Helps map related records across files |
| Testing | Fill fixtures quickly | Good for API payloads, mocks, and integration cases |
| Logs and demos | Produce sample IDs on demand | Convenient for documentation and screenshots |
Frequently Asked Questions
What is the difference between UUID v4 and UUID v7?
UUID v4 is random, while UUID v7 includes Unix time ordering plus random bits. v7 is often easier to sort chronologically in logs and databases.
Why would I use UUID v6 instead of v1?
UUID v6 keeps the time-based nature of v1 but reorders the timestamp fields so the values sort more naturally in storage systems and indexes.
Are the generated UUIDs uploaded anywhere?
No. The generation happens locally in your browser and the tool does not need a server round trip to create or download the output.
Can I generate a single UUID instead of a batch?
Yes. Set the batch size to 1 if you only need one value.
Does this tool generate uppercase UUIDs?
No. The output is intentionally lowercase with hyphens because that is the most widely accepted and readable default format.