Blur faces in a photo

How to use it

1. Choose your photo, drag it onto the box, or paste one.
2. The face finder runs on your device and marks the faces it finds, blurring them straight away. Tap a box to remove it if you want that face left visible.
3. Drag over any face it missed, or over anything else you want to hide.
4. Choose blur, pixelate or a black box, and set how strong it is.
5. Look over the whole photo, especially small faces and people in the background, then press Save picture and download the copy.

School events and photos of children

School plays, sports days, parties and other group events can put a lot of people into one photo. Some faces may be large and obvious while others are much smaller in the background.

Use the automatic face finder as a starting point, not as the final check. Look over the whole photograph yourself before sharing it, and add a box by hand around any face you want to hide that was not found. Blurring a face does not guarantee that a person cannot be identified from clothing, location, surroundings or other details in the photograph.

People in the background

The person you photographed may not be the only person visible. Check behind the main subject, through windows and mirrors, at the edges of the photograph and in crowds. Small, partly hidden or turned-away faces can be harder for an automatic face finder to detect. If FilePresto misses one, draw an area over it yourself.

Number plates, name badges and other details

The automatic finder is for faces. It does not find number plates, name badges or other private information for you. You can add an area by hand over anything else you want to hide, such as a vehicle number plate, a staff badge, a name on a parcel or information visible on a screen. Always check the finished image yourself, because FilePresto cannot decide which details are sensitive in your photo.

Check before you share

Automatic face detection is useful, but it is not perfect. A face may be missed if it is very small, turned away from the camera, partly covered, in deep shadow or only partly visible at the edge of the photograph. Before you share the edited copy, check every person in the photo, look closely at the background and edges, make sure every blur, pixelated area or black box fully covers what you meant to hide, and open the downloaded copy and look at it again. FilePresto does not claim that blurring a face guarantees anonymity.

How strong should the blur be?

There is no single blur strength that is right for every photograph. A light blur can leave features visible. If hiding the detail matters, make the effect stronger until you are satisfied with the finished image, or use pixelation or a black box instead. Even a strongly blurred face may not make somebody anonymous if other details in the photograph identify them.

Why use a private face-blurring tool?

Photos of people can themselves be sensitive, and many face-blurring websites send your original photo to their servers to edit it. Here the face finder and the editing run in your browser on your own device, and your photograph is not uploaded to FilePresto for face detection or blurring. The face finder is a small model of about 7 MB that your browser downloads from this website when the page opens, before you choose a photo. It is designed to locate faces, not to identify the people in them. You can then review the marked areas yourself before saving anything.

What is saved

FilePresto leaves your original photograph unchanged. When you download the result, you receive a new image with the blur, pixelation or black boxes applied to the picture itself, not saved as a separate layer that can be switched off. Location and camera details stored in the original photo are not carried over to the new copy, which we checked on 1st October 2026 with a photo that held both. Keep the original separately if you may need the unedited photograph later.

Questions