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.

Use caller

Your live card

Generated 10/25/2026, 3:02:36 AM

Card ID: 48f0523f-5229-4f4a-aaab-b7314f27c6b0

Integrity: verified

Checksum b520f02

New card ready to play.

Marked numbers

0 / 10

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: 10/25/2026, 3:02:36 AM
Last saved: 10/25/2026, 3:02:36 AM
Checksum: b520f02
Snapshot: 48f0523f • 10/25/2026, 3:02:36 AM • checksum b520f02

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.