UUID / GUID Generator — About

Understand the guarantees, limitations, and best practices when generating UUIDs in bulk for your projects.

Key points

Why use this generator

It provides instant, client-side batches with formatting controls so you can copy, download, or share IDs without leaving the browser.

People-first explanations

We translate the differences between versions and randomness sources into plain language, making it easier to decide which one suits your workflow.

Collision monitoring

The tool highlights duplicates in any batch so teams can spot issues immediately and regenerate before deploying IDs.

The UUID generator is designed for engineers, QA specialists, and support teams who need trustworthy identifiers on demand. By relying on the proven uuid library and the browser's cryptographic APIs, it produces standards-compliant values without round-tripping data through a server.

How the generator works

Versions 1 and 7 include a time component so identifiers sort chronologically, while version 4 offers pure randomness for situations that do not need ordering guarantees. The tool exposes toggles for uppercase output and hyphen removal, which many build systems and spreadsheets prefer when pasting large batches.

Collision detection

The chance of a collision is astronomically low, but quality gates appreciate reassurance. Every batch is scanned for duplicates and flagged if any appear. When that happens, simply generate a new batch; the entropy source resets on every run.

Privacy posture

Nothing is uploaded or logged. If you use share links, the encoded state lives entirely in the URL. Review those links before pasting them into tickets or documentation to ensure no proprietary identifiers leak outside your organization.

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How to use this tool

Step 1
What this tool delivers
A configurable UUID generator that respects privacy, flags duplicates, and supports share links so distributed teams can stay in sync.
Step 2
How to incorporate it into workflows
Generate IDs for API keys, database seeds, or QA fixtures, then copy or download the list. Use share links for reproducible batches during code reviews.
Step 3
Limitations to remember
The generator caps batches at 100 to prevent runaway clipboard copies. For millions of IDs, use a scripted approach and feed the results through your own monitoring.

Frequently asked questions

Are UUIDs ever sent to a server?: No. Generation happens entirely client-side. The only time UUIDs leave the page is when you copy them, download a file, or intentionally share a link that embeds the batch in the URL.
When should I regenerate a batch?: If the collision banner appears or if you adjust formatting options after generating, run the tool again to produce a fresh list that matches your requirements.
Can I trust hyphenless or uppercase UUIDs?: Yes. Hyphen removal and uppercase conversion keep the underlying 128-bit value intact. Some databases prefer lowercase with hyphens, so double-check your target system before sharing.

Share links contain the UUIDs you generated. Avoid distributing links that include sensitive identifiers and clear the list before screen sharing if secrecy matters.