What your background gives away

A background is a location, written in pixels

Look at a photo of yourself at a cafe table and you are looking at two photographs: one of you, and one of the room. The second one is the one you never composed. It has the counter, the menu board, the window, the street through the window, and whatever the light says about the time of day — and none of it was a decision.

That matters because a place is identifiable in a way a person often isn't. A stranger cannot look up your face; a stranger can absolutely recognize a shopfront, a station, a block of flats, or the particular junction visible past your shoulder. Local knowledge does most of the work, and local knowledge is exactly what a stranger who cares about you already has.

Hiding it is one operation rather than a hunt. Blurify finds the subject as a single mask and everything outside it becomes the background, so you are not trying to spot every telling detail yourself — you decide what happens to all of it at once. The sample below is a park photo with the people kept sharp and the park taken past the point of being nameable.

The details that pin a place exactly

Some things in a background do not merely suggest a place, they name it. A house number beside a door, a street sign on a corner, a shop's fascia, the number on a bus stop, the plate on a car parked at the kerb. Each of these is small, sharp and high-contrast, which is exactly what zooming is for — assume anyone looking will pinch-zoom the corners.

Workplaces and schools are the second category, and they travel further than people expect. A logo on a wall, a lanyard on a desk, a uniform, a timetable pinned behind you, a branded coffee cup. On their own they say very little; next to a face and a first name they narrow a stranger's search from a city to a building.

The third is the one that catches photographers rather than subjects: a landmark, a view, a skyline, a hill out of the window. A recognisable view is a coordinate. If the photo is a holiday shot that's usually fine; if it's a photo taken from your own flat, it is the floor plan of where you live.

The people and the screens you didn't mean to publish

Everyone else in the frame is in the photo without having agreed to be. The couple at the next table, the colleague crossing behind you, the child in the playground twenty meters back. Whether that matters is a judgment call about where the photo is going, and the honest version of the call is that a private message is not a public post and should not be treated as one.

Screens are the quiet one. A monitor behind you may be showing an inbox, a customer record, a ticket queue or a codebase; a whiteboard may be showing next quarter's plan; a wall calendar shows where you'll be on a specific Tuesday. None of it is legible to you while you're taking the picture, and all of it is legible at full resolution afterwards.

There's a matching page for that job when only the screen needs to go and the rest of the shot should stay: Redact a screenshot covers captured screens, and Blur part of an image covers one rectangle anywhere in a photo. Hiding the whole background is the blunt instrument, and it's the right one when there is more than one problem behind you.

How much of it to hide

Start from where the photo is going rather than from what's in it. A photo for a marketplace listing, a dating profile or a public post is going to strangers who can zoom, crop, reverse-search and compare it with your other posts. A photo for three friends in a group chat is not. The same picture can deserve a completely different answer on two different days.

If exactly one thing is wrong — a name on a parcel, one face at the edge, a screen in the corner — cover that one thing and leave the rest of the picture sharp. Blurring an entire room to hide a single envelope throws away the photo you actually wanted, and a background that's obviously been wiped invites the question of what was in it.

If several things are wrong, or if you can't honestly say you've spotted them all, treat the whole background. That's the case for cutting it out or blurring all of it: it covers the details you noticed and the ones you didn't, which is the real argument for doing it wholesale rather than region by region.

The background is not the metadata

These are two separate exposures and fixing one does nothing for the other. The background is in the pixels; the location written by your phone's camera is in the file's EXIF block, invisible on screen and precise to a few meters. Blurring the street outside your window while posting the coordinates of your living room is a common and completely self-defeating combination.

Blurify strips EXIF and GPS from every export as a side effect of re-encoding the file, so a photo that has been through the editor at all comes out without them — there is no setting for it and no way to keep them. If the metadata is the only problem and the picture itself is fine, the Remove EXIF data page is the shorter route.