80-ball bingo

80-Ball Bingo Marker

Track your 4x4 80-ball card online. Marks stay saved if you refresh and every card shows a created-time checksum for fair play.

Use caller

Your live card

Generated 3/13/2026, 7:58:16 PM

Card ID: 501f3450-7cf5-4085-b2db-7097839c633a

Integrity: verified

Checksum 82492350

New card ready to play.

Marked numbers

0 / 16

Nothing marked yet. Tap a square or type a number.

Saved state & integrity

Everything lives in your browser: card numbers, marks, timestamps, and a checksum. If the checksum ever disagrees with the saved data, we flag it here—handy for keeping play honest without a backend.

Created: 3/13/2026, 7:58:16 PM
Last saved: 3/13/2026, 7:58:16 PM
Checksum: 82492350
Snapshot: 501f3450 • 3/13/2026, 7:58:16 PM • checksum 82492350

Bring your own numbers

Enter 16 unique numbers between 1 and 80, separated by commas or spaces.

We validate uniqueness & range 1–80.

How the integrity badge works

Every card stores a timestamp, card ID, your marks, and a checksum in local storage.
The checksum is recalculated on load; if it doesn’t match, we flag it so everyone knows to reset.
No account or server required—perfect for honor-system games where you still want a paper trail.
Need to switch devices? Copy the snapshot text and paste it into a note for reference.