We are the MozFace team. A budgeting or savings update on social media, a marketplace deal, a balance shared with family, a receipt sent to accounting — there are more moments than you'd think when you photograph a bank statement, bankbook, or debit card. And right there in the shot are account numbers, card numbers, and your name — details you should never show as-is. This article covers what to hide in these photos, and how to hide it reliably.
The short answer: crush numbers with a solid black-out (full fill), not a light mosaic. With MozFace, just trace over the digits with the manual brush. Everything is processed on your device.
What to hide in a bank photo
First, know what needs covering. On a bank statement or bankbook: the account number and routing number, and your name. On a debit card: the card number, expiration date, and name. Easy to miss is any membership barcode printed by the bank — that can be scanned too, so it belongs on the list. Depending on the purpose you may need to show your name, but if the photo is going to a public social feed, hiding it is the default.
What's dangerous is less any single detail than the combination. When your account number, name, and bank name appear together, impersonation and phishing get far more convincing, opening the door to fraud. Don't assume "just the number is fine" — treat everything in the frame as one set.
A light mosaic can let digits be guessed
Pay attention to how strongly you hide things. A blur or a mosaic that's too fine can leave faint outlines of the digits, and the sequence can be guessed by zooming and comparing. Digits are only 0 through 9, so even a slight clue narrows them down quickly.
That's why for strings of digits like account and card numbers, the safe choice is a solid black-out (full fill) that erases the information entirely. A fill leaves none of the original pixels, so no amount of zooming can recover anything.
Black out the numbers with MozFace's manual brush
MozFace blurs faces automatically, but you can hide non-face areas freely with the manual brush. Open the photo, choose the fill style, and trace over the numbers with your finger. Work through everything that worries you — account number, card number, name, barcode — one by one.
Make the brush thin for a single line, or thick to cover a whole field. If you're worried about gaps, trace a little past the edges of the number to be safe. A single tap undoes a mistake, so you can adjust until you're satisfied.
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Better than covering with a sticky note before shooting
You could put a sticky note over the number and then take the photo — but in practice, the digits show through in the note's shadow, or the note slips and an edge digit peeks out. Then you're re-sticking and re-shooting every time you notice something.
It's far more reliable to shoot normally and paint over the sensitive parts in an app afterward. You paint while seeing the finished result on screen, so you catch missed spots on the spot. The edited image is saved as a separate file, leaving the original untouched. Editing happens entirely on the device, so your bank photos are never sent anywhere.
MozFace
Black out account and card numbers reliably with the manual brush. Auto-detect and blur faces. Everything is processed on your device — fully offline.
Learn more about MozFaceFrequently asked questions
Is it okay to share just my account number?
It's information you do give someone so they can send you money. Posting it publicly is different: combined with your name and bank name, it becomes material for fraud and phishing, so hide it in any photo you post.
Why is a black-out better than a mosaic?
A light mosaic or blur can leave outlines of the digits, letting the sequence be guessed. A solid fill leaves none of the original pixels, so for strings of digits like account and card numbers, blacking out is the safe choice.
What should I do about the balance?
If the point of the post is your savings progress, you can leave it visible. If there's no need to show it, black it out like the numbers. With the manual brush, it's easy to keep just the line you want visible and hide the rest.
Are my bank photos sent anywhere?
In MozFace, editing happens entirely on your device, and your photos are never sent to any external server. It works even with no signal.