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 6/12/2026, 12:07:36 AM

Card ID: 2a4ec9b6-38a9-4940-a32c-a831d78adae0

Integrity: verified

Checksum 47d6c9d3

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: 6/12/2026, 12:07:36 AM
Last saved: 6/12/2026, 12:07:36 AM
Checksum: 47d6c9d3
Snapshot: 2a4ec9b6 • 6/12/2026, 12:07:36 AM • checksum 47d6c9d3

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.