UUID Generator
Generate up to 100 UUID v4 identifiers at once. They are created on your device with the browser's cryptographic randomness and never leave it.
How to use
- Set the count and options (uppercase, remove hyphens).
- Press "Generate" to create UUID v4 values.
- Grab the results with "Copy all".
Frequently asked questions
What is UUID v4?
A 128-bit unique identifier made from random numbers. Collision odds are effectively zero, so it is widely used for database keys, file names and session IDs.
Are generated UUIDs sent to a server?
No. They are generated on your device with the browser's crypto API and never sent anywhere.
Is it really unique?
UUID v4 has 122 bits of randomness, so even billions of them have a negligible chance of collision.
Practical example and verification criteria
UUID Generator: First identify whether the source is plain text, a URL component, JSON, CSV, CSS, JavaScript, a color, or a token, then check character encoding, delimiters, quoting, and line-ending rules. Encoding is not encryption, decoding is not signature verification, and minification is not code optimization; define the required output format and destination before running the tool.
UUID Generator: For a quick check, start with xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx as a small input whose result relationship you can verify directly. Confirm that the input summary, units, and options match your intent before applying the tool to real values or a copy of the source; this reduces setup mistakes.
UUID Generator: Put the output into the target browser, build tool, API, or design surface and check for parsing errors or changed meaning. Decoding does not prove authenticity, a hash cannot be decrypted, and minified code is not guaranteed to behave like the source. Preserve the original and tests, and avoid entering passwords, tokens, or personal data.
UUID Generator · Work record: For real work, record the input conditions, selected options, and result together. Do not assume the same state will remain after a refresh or device change. Preserve important results separately using copy, download, a screenshot, or another method the page supports, then reopen them in the target environment.
UUID Generator · Error check: If an error or unexpected result appears, reduce the input, run again with default options, and then change one condition at a time. Recording error messages and boundary values helps distinguish format issues, unsupported cases, and browser resource limits, and prevents an empty result from being mistaken for success.
UUID Generator · Scope of use: Check the page guidance for browser processing versus server lookup, storage location, and supported scope. Use sensitive source material or secrets only when strictly necessary. High-impact work such as legal, financial, or medical decisions or changes to an operational system requires current authoritative information and a separate verification process.