UUID Generator

Generate one to 100 version 4 UUIDs with the browser’s secure random source, then copy the identifiers. UUIDs are identifiers rather than passwords.

Free to useNo sign-upRuns in your browser

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How UUID Generator works

Secure random bytes are formatted with version 4 and variant markers.

The generator uses crypto.randomUUID where available. Its fallback fills random bytes with crypto.getRandomValues, sets the version and variant bits, then formats the bytes into the UUID groups.

UUIDs are generated locally using your browser's secure random number generator. They are identifiers, not secrets or passwords.

Conceptual illustration of random bytes formatted into version 4 UUID identifiers. — UUID version 4 uses random bytes with defined version and variant bits.

How to use UUID Generator

Choose how many version 4 identifiers you need, then generate a fresh batch.

Choose the number of identifiers

Enter a whole number from one to 100 in Number of UUIDs. Select the batch size needed for your records. The generator requires a browser secure random source; it does not take a name or input string to derive the identifiers.

Choose the number of identifiers

UUID Generator native input panel with the actual Number of UUIDs settings used for this example. — Configure Number of UUIDs; select Generate UUIDs.

Generate a fresh UUID list

Select Generate UUIDs and inspect the version 4 identifier list. A fresh random batch is produced on each run. Keep the UUID groups and hyphens intact when using the text in a destination that expects the displayed format.

Generate UUIDs

UUID Generator actual result panel showing 3 generated. — Submitted result: 3 generated. Format: RFC 4122 UUID v4.

Copy and verify the destination

Use Copy result or select the generated text directly. The page does not check existing identifiers in your destination, so apply its validation separately. UUIDs are identifiers rather than secrets or passwords, and random uniqueness is not mathematically guaranteed.

Copy and verify the destination

UUID Generator actual output and export region and result note after submitting the pictured settings. — Review the actual UUID Generator output and visible Copy result controls. Read the result note.

Generate UUID v4 identifiers for records and objects

Use these random UUID v4 values in systems that accept their text format. If your application calls them GUIDs, check its version and format requirements.

Create sample record identifiers

Generate a small batch for a test dataset and assign one line to each record. Keep that assignment stable while testing relationships. Regenerating identifiers halfway through a test can break references even when every new value is correctly formatted.

Try these inputs

Developer input and configuration represented by document cards. — Prepare the input. Concept illustration.

Prepare database seed data

Copy generated values into a seed file that expects text UUIDs. Check the database column type and its constraints before importing. This tool supplies identifier strings; it does not connect to the database or reserve the values there.

Compare a scenario

A developer example flowing from input to reviewed output. — Inspect an example. Concept illustration.

Label an independent object

Use one generated value as a label for an object whose identity should not depend on its display name. Store that identifier with the object in your own application. The generator does not retain an object directory or map values to names.

Use the tool

Developer output handed to the next stage of a workflow. — Use the result in your workflow. Concept illustration.

UUID v4 format and random uniqueness

Understand the identifier format and the limits of random uniqueness.

The output follows the version 4 UUID layout and contains random bytes with the required version and variant bits. It is an identifier string, so do not use it as a password or authentication secret.

A successful generation tells you the browser produced the requested values. It does not confirm uniqueness against an existing collection or validate a database schema. Those checks belong to the system that stores the identifiers.

Check the output Try another input

A developer result reviewed alongside its source. — Review the returned output. Concept illustration.

Handle browser and copy failures

Check browser support and the destination’s identifier requirements.

The generator requires a supported secure random source. If the browser cannot supply it, the page reports a generation error rather than using a weak substitute. Try a supported browser and keep existing identifiers unchanged.

If Copy result reports that copying is unavailable, select the result text and copy it manually. Check that all lines reached the destination. This page has no UUID file download, bulk database import or identifier history.

Check your inputs Return to the tool

Input format and assumptions reviewed for a developer task. — Check format and assumptions. Concept illustration.

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Use UUID Generator

Generate one to 100 version 4 UUIDs with the browser’s secure random source, then copy the identifiers.

Generate UUIDs

UUID Generator: common questions

Answers about using UUID Generator and understanding its results.

Are UUIDs unique?

Random version 4 UUIDs have an extremely low collision probability, but uniqueness is not mathematically guaranteed.

Are the UUIDs uploaded?

No. The browser generates them locally.

Can I download a file from this page?

The current page provides a Copy result button for the UUID list. It does not add a file-download control.

Does generating again reuse the previous list?

No. Selecting Generate UUIDs makes a fresh set using the browser random source. Store identifiers in your own destination if you need to retain them.