Hide faces and other identifying details before you share a photo. Blur, pixelate or mask everyone in the shot or just the people you name, while the rest of the picture stays exactly as it was.
How the blur face in photo works
Upload the photo and say who or what to obscure and how, for example 'blur every face except the person in the red coat' or 'pixelate the licence plate heavily'. Run the tool and check that nothing identifiable is still readable, including reflections and partially turned faces. If a face was missed, describe its position and run the tool again on the same upload.
Tips for the best results
Say whether the blur should be heavy enough to be irreversible, and prefer a solid mask or strong pixelation for anything sensitive. Faces in profile, in reflections or in the far background are missed most often, so scan the whole frame before sharing. Mention plates, badges and screens separately.