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.
Your live card
Generated 4/27/2026, 9:56:51 PM
Card ID: 9ebfa810-0078-4324-8f73-78b7c693035d
Integrity: verified
Checksum 62488e45
New card ready to play.
Marked numbers
0 / 16Nothing 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
- 4/27/2026, 9:56:51 PM
- Last saved
- 4/27/2026, 9:56:51 PM
- Checksum
- 62488e45
- Snapshot
- 9ebfa810 • 4/27/2026, 9:56:51 PM • checksum 62488e45
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.