UUID
Bulk UUID Generator
Create batches of UUID v4 or v7 values, choose an output format, and copy or download the result without server processing.
Runs locally in your browser. Your input is not uploaded.
How this tool works
Bulk UUID generation is useful for seed data, import templates, QA scenarios, and offline test fixtures.
The output can be formatted for plain text, comma-separated values, or JSON arrays.
Examples
- Generate 100 UUID v4 values for test records.
- Export 500 UUID v7 values as one ID per line for a migration fixture.
- Export a JSON array for a synthetic import and parse it before loading the fixture.
Common use cases
Bulk generation workflows
Bulk UUID output is useful for seed files, QA spreadsheets, import templates, and sample data. Choose one-per-line output for plain text fixtures, comma-separated output for quick spreadsheet work, and JSON array output for scripts.
The tool caps quantity to keep the browser responsive. For production records, generate IDs in the system that owns the write path so uniqueness, validation, and audit behavior stay in one place.
Format choices
- Use UUID v4 for random fixture data that does not need chronological order.
- Use UUID v7 for sample event records where order makes the output easier to inspect.
- Use compact or uppercase formatting only when the receiving system expects that representation.
Invalid or unsafe assumption
Invalid/failure example
Requesting an unbounded batch that freezes the browser or overwhelms a downstream system.
Mistakes to avoid
- Generating more values than a fixture needs.
- Using comma text where a strict CSV header is expected.
- Assuming browser-generated IDs reserve records in another system.
Limits of this workflow
The quantity is capped to protect browser responsiveness.
Downloaded batches are synthetic data, not database reservations.
Local-processing and privacy boundary
The batch is created and exported locally; downloaded files follow the device's normal file and backup policies.
Practical workflow
- Choose version, formatting, and a bounded quantity.
- Generate and inspect uniqueness.
- Select TXT, CSV, or JSON for the consumer.
- Parse the export before importing it.
Related guides
Official references
FAQ
What is the maximum batch size?
The tool caps generation at 10,000 UUIDs to keep browser performance predictable.
Can I export JSON?
Yes. Choose JSON array output when you need generated IDs in a script or seed file.
Does generating a batch reserve those IDs?
No. It only creates values; the owning application must enforce uniqueness when records are stored.