Pasting from the clipboard (Ctrl / ⌘ + V) works too.
Press “Detect faces”, or drag on the image.
Find the faces in a photo and hide them with blur, mosaic or a solid fill. The image never leaves your browser
Delete or use “Delete” in the list.
Detection and editing run in your browser, and the image is never sent to a server.
Exported images do not carry Exif data (capture time, GPS location and so on).
No. Face detection, the blur or mosaic itself, and the export all run inside your browser. The image is never sent to a server. Only the detection model (about 250KB) and its runtime (WebAssembly, about 10MB) are downloaded from their sources (jsDelivr and Google's model hosting). That download happens once, when you press Detect, and later visits reuse the browser cache.
Drag on the image to add that area manually. Profiles, backs of heads, small faces and faces hidden behind masks or hats are often missed by automatic detection, so always check the result with your own eyes before exporting. Boxes added automatically can also be selected and deleted.
No. The export re-encodes the picture from a browser canvas, so Exif (capture time, camera model, GPS coordinates and so on) is not carried over. When you are hiding faces, leaving the location attached would defeat much of the purpose, so this is intentional. If you want to inspect or edit Exif itself, use the Image EXIF Editor.
A solid fill is the safest choice when the area must not be recoverable. Blur and mosaic look more natural, but at weak settings a person can still be recognised. Raising the strength slider increases the blur radius or the mosaic tile size. Zoom into the preview and confirm that the face shape and hairstyle no longer identify the person before you export.