UtilFoundryDEV TOOLS

Luhn / PAN Check

Check an account number against the Luhn algorithm and show it masked. Use test numbers only.

  • 100% Free
  • No account required
  • Runs in your browser
  • No data is uploaded
Use masked test data only. PANs, Track 2, PIN blocks and production keys must never be pasted here.
Local saving paused

Private to this browser, not a cloud backup. Saves expire 7 days after the last save. Avoid saving sensitive data on shared devices.

Local saving is disabled for this sensitive tool. Use sanitized test data and clear the editor when finished.

Saved Luhn / PAN Check workspaces

Saved only on this device. Clearing browser data removes your workspaces. Expired saves are removed when this app next checks storage.

No saved workspaces for this tool yet.

No settings needed
Text to Luhn result

Input

Paste or edit your number, then click “Run tool”.

Type, paste or drop a file
Text
Ln 1, Col 1Spaces: 2UTF-816 bytes

Output

Luhn result (read-only).

Read-only
Text
Ln 1, Col 1Spaces: 2UTF-80 bytes
Ready when you arePaste your input, then press Run tool or ⌘ ↵