UUID generator

Random v4 UUIDs, up to 1000 at once.

UUIDs come from crypto.randomUUID(), the browser's cryptographically secure generator.

How to use it

  1. Set how many you need.
  2. Press Generate and copy.

Questions

Are my files uploaded to a server?

No. The tool runs entirely in your browser using JavaScript, so your files never leave your device. You can even disconnect from the internet after the page loads and it keeps working.

Guides

All guides
Developer tools · 23 Oct 2026How to Generate a UUID: Online, Python, JavaScript, SQL & ExcelHow to generate a UUID online or in Python, JavaScript, Java, PostgreSQL, Linux and Excel, plus UUID v4 vs v7 and what a Minecraft UUID really is.Developer tools · 23 Oct 2026How to Check the SHA-256 Hash of a File (Windows, Mac, Linux)Check a file's SHA-256 hash with certutil or PowerShell on Windows, shasum on Mac, sha256sum on Linux, or in your browser. Verify downloads properly.Developer tools · 23 Oct 2026How to Convert an Image to a Base64 String (and Back)Convert any image to a Base64 string or data URI for HTML, CSS and JavaScript, decode Base64 back to an image, and know when the size overhead is worth it.

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