UUID Generator

About UUID Generator

A UUID is a unique identifier used in databases, apps and files. This tool generates version 4 UUIDs using the browser's crypto functions, in bulk. Developers use them for IDs and test data. The chance of duplicates is extremely small.

Example

Input: 5. Output: five identifiers such as f8082663-a104-42e3-800c-0984ab46de2d.

Tips for better results

• Use UUIDs when you need IDs created without a central counter.
• Store them in a proper UUID column type.
• Do not use them as secrets.

When to use UUID Generator

Reach for this tool when you need identifiers right now and do not want to write a script. Developers fill test databases, seed spreadsheets with sample records, name temporary files, or create correlation IDs for logging. Product managers and QA testers also use it when a form or an import file requires a unique ID column. Generating a batch at once saves time compared with creating them one by one in a console.

Real-world uses

• A developer seeds a development database with fifty fake customer records and needs a unique ID for each row in the import file.
• A QA engineer creates a few IDs to use as order references while testing how an API handles lookups for items that do not exist.
• A data analyst adds a unique key column to a spreadsheet before merging several exports that otherwise have no common identifier.
• A backend engineer needs a request ID to paste into a log search while reproducing a bug reported by a customer.

Common mistakes to avoid

• Using generated IDs as login tokens, reset links or API keys. They are meant to identify things, and security tokens should come from a purpose-built system.
• Changing letter case or removing dashes in one system but not another, which can make the same ID look different when records are compared as text.
• Storing the ID as a plain text field in a large table without thinking about index size. A native UUID or binary type is more compact.

Generate random v4 UUIDs in bulk. It works instantly in your browser, so there is nothing to install and nothing to upload. UUID Generator is part of our collection of 100 free tools in the Developer & Data category.

How to use it

1. Enter your information or choose a file in the tool above.
2. Your result appears right below the tool.
3. Copy the result, or adjust your input and try again.

Frequently asked questions

Can I generate UUIDs without dashes?

The standard text form uses dashes in an 8-4-4-4-12 pattern. If a system wants a compact form, you can strip the dashes yourself, but confirm that the receiving system accepts both versions.

Do UUIDs sort in the order they were created?

Random version 4 UUIDs do not sort by creation time. If you need ordering, add a separate timestamp column or look at time-ordered identifier formats designed for that purpose.

Is UUID Generator free to use?

Yes. UUID Generator is completely free and you do not need to create an account.

Is my data uploaded anywhere?

No. This tool runs in your browser, so what you type or choose stays on your device.

How accurate are the results?

Calculations use standard formulas, but always double-check important figures, especially for money, health or legal decisions.