50-ball bingo
50-Ball Bingo Marker
Tap to dab a traditional 5x2 quick bingo card for 50-ball games. Marks auto-save on this device with a timestamped checksum for honesty.
Your live card
Generated 9/10/2026, 1:58:28 AM
Card ID: dfc0bd7c-ad18-40d0-afef-dd7b78dbc3dd
Integrity: verified
Checksum 8730cbc1
New card ready to play.
Marked numbers
0 / 10Nothing 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
- 9/10/2026, 1:58:28 AM
- Last saved
- 9/10/2026, 1:58:28 AM
- Checksum
- 8730cbc1
- Snapshot
- dfc0bd7c • 9/10/2026, 1:58:28 AM • checksum 8730cbc1
Bring your own numbers
Enter 10 unique numbers between 1 and 50, separated by commas or spaces.
We validate uniqueness & range 1–50.
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.