This is the MozFace team. Scenery on a trip, a school event, the inside of a restaurant — shoot video and other people's faces end up in it. With a photo you look at one frame and decide. With video, even thirty seconds is enough to miss someone. This article covers how to catch those faces before you post to YouTube, TikTok, or Instagram Reels.
You cannot take a post back
If you notice a face after publishing, delete the video, and re-upload a fixed version, the time it spent public cannot be undone. Anything saved or clipped and reposted survives the original being removed. That is why the hiding has to be finished before you press upload.
Be especially careful with children who are not yours. Sports days, recitals, playgrounds, pools. You meant to film your own child, and other families' children came with the frame. That is not a decision you get to make on another parent's behalf, so hiding them is the safe default.
Stop hunting for people to hide
Faces get missed because the task is framed as "find everyone in the shot, then hide them." Anything framed as a search can fail by not finding something — and a video gives you the entire running time to search through, which is why it goes wrong more often than photos do.
MozFace inverts the order. Load a video and faces are detected automatically, with editing starting from everyone already blurred. From there you tap to reveal yourself and anyone else you are happy to show. What you are searching for is not "people to hide" but "people to show" — and you already know who those are, so there is nothing to miss.
When faces move, their positions are tracked automatically. A passerby walking across the frame keeps their mosaic the whole way.
The pre-upload checklist
Before exporting, review the clip in this order. Misses in video cluster around the same few moments.
Someone crossing the frame. In from one edge, out the other. The shorter the appearance, the easier it is to miss.
Camera pans and tilts. Somebody else drifts through the middle of the movement for a moment.
A back turning around. Someone facing away the whole time can glance back once at the end.
Non-face exposures. House numbers, license plates, documents, shipping labels, a notification on a phone screen. None of these are detected as faces, so cover them by hand.
Audio. Hiding the picture achieves nothing if a name or address is spoken out loud. Listen through once too.
To cover something that is not a face, place an oval, a rounded rectangle, or a horizontal band. Each region can be given a time range, so you can cover a sign for just the few seconds it is visible. For plate numbers and text, turning pixelation up is more reliable than blur.
Do not forget the thumbnail
A YouTube thumbnail or a TikTok cover is a separate image from the video itself. Blurring the video does not blur the thumbnail. Thumbnails appear in search results and recommendation feeds, so they are seen by more people than the video is. If you are using a frame pulled from the footage, process that image too.
Editing without uploading first
Most online blurring services send your video to a server to process it, which means handing over the unedited footage — the very thing you are editing because it contains faces. MozFace runs detection through export entirely on your device, so your video is never transmitted anywhere and the whole job stays on the phone that shot it. Whether the finished video is appropriate to publish is your own call to make.
MozFace
Select a video and every face is blurred automatically. Because you tap to reveal rather than hunt to hide, nobody gets left exposed before you post. All processing stays on your device.
Learn more about blurring faces in videoFrequently asked questions
Do YouTube and TikTok have face-hiding features?
You cannot count on the posting app to cover everything reliably, so it is safer to process the video file itself before uploading. Post an already-edited file and you do not depend on the platform at all.
Can I hide a passerby who is only visible for a second?
Every detected face starts out blurred, brief appearances included, so you begin from a hidden state and tap to reveal only the people you want to show.
Does the thumbnail need blurring too?
Yes. A thumbnail is a separate image from the video, so editing the video does not affect it. If you use a frame pulled from the footage, process that image as well.
Is the unposted video sent anywhere?
With MozFace, detection through export runs entirely on your device, so your video is never sent to an external server.