▚ sandboxmax

Bulk UUID v4 Generator

Generates RFC 4122 version-4 UUIDs with the browser’s native crypto.randomUUID() — the same cryptographically secure source your backend uses, running on your own machine. Crank the quantity slider to 5,000 and watch the timing metric: the whole batch lands in milliseconds, because nothing makes a network round-trip.

runs 100% in your browser — secure entropy, zero transmission

  1. 1Configure the batchPick UUID v4 or NanoID, set the quantity (up to 5,000), and tune case, hyphens, and prefix/suffix.
  2. 2Generate instantlyOne click pulls secure entropy from the crypto Web API — the timer proves it takes milliseconds.
  3. 3Copy or downloadGrab the whole pack to your clipboard or save it as a .txt file, one ID per line.

ID type

15,000

Formatting

0

IDs generated

—

collision risk

—

generated in

Entropy comes from your browser’s crypto Web API — generated on your CPU, never transmitted, never logged.

More ID tools

/uuid/generate-custom-nanoid-strings

Custom NanoID String Generator

/uuid/secure-cryptographic-id-seeding

Cryptographic ID Seeder for Mock Databases

Is it safe to paste sensitive data into the Bulk UUID v4 Generator?

Yes. The Bulk UUID v4 Generator runs 100% client-side inside your browser thread — nothing you paste is uploaded, logged, or transmitted. SandboxMax is a static site with no backend server, no cookies, and no trackers: open your browser's network panel while you work and you'll see zero requests leave the tab.