This is the MozFace team. When you want to hide a face that ended up in your footage, the first place most people look is the built-in Photos app — and then they cannot find a blur option anywhere. This article covers what the built-in tools on iPhone and Android actually do, and how to blur a video using nothing but your phone.
What the built-in apps can and cannot do
Both the iPhone Photos app and Google Photos on Android can edit video. What they offer, though, is trimming length, adjusting brightness and colour, rotating and cropping, changing speed — edits that apply to the frame as a whole.
With a photo you can at least use markup to drop a shape over something. That route is not available for video, and even if it were, a shape parked in one spot stops being useful the moment your subject moves. Video blurring is missing from the built-in tools because it requires handling a position that changes over time.
So you need something else. There are broadly three options.
Three options compared
1. Desktop video editing software
The most capable option, but it means moving the file to a computer, editing, and moving it back. Right for a piece you are crafting carefully; heavy for "I just want to hide a face before I post this."
2. Browser-based online services
Nothing to install, but most of them upload your video to a server to process it. Footage you are editing precisely because it contains faces or personal details gets sent out first, unedited — and video files are large, so you pay in bandwidth and waiting too.
3. Doing it in a phone app
The work stays on the device that shot the footage. With automatic face detection there is no manual selection either. For everyday use this is the fastest route.
Blurring a video on your phone, step by step
MozFace runs on both iOS and Android and hides faces in photos and video automatically. For video, the steps are:
- Add your video — open the app, pick a video from your device, and detection starts as it loads.
- Faces are blurred automatically — every detected face appears already blurred, and its position is tracked as it moves.
- Reveal who you want to show — tap a face in the thumbnail list to unblur that person.
- Save — play it back to check, then save. The result is exported to your gallery and the original stays as it was.
Anything that is not detected as a face — a license plate, a house number — is covered by hand using an oval, a rounded rectangle, or a horizontal band. Each region can be given a time range, so it only applies to the seconds where it is needed.
What "no upload" actually buys you
MozFace runs detection, mosaic rendering, and export entirely on your device. Your video is never sent to an external server.
That is a privacy point and a practical speed point at the same time. Uploading a few hundred megabytes, waiting for processing, then downloading the result — that whole round trip disappears. It also means the app works identically in airplane mode or with no signal at all.
Check before you save
Finishing on your phone is convenient, but do not skip the review. Play the clip through once before exporting and watch for someone crossing the frame, sharp camera movements, and a face turning back toward the camera. Check for non-face exposures at the same time — a house number in the background, a document, a notification on a screen. Whether the finished video is appropriate to publish is your own call to make.
MozFace
For iPhone and Android. Select a video and faces are detected and blurred automatically, tracked as they move. No upload — everything runs on your device.
Learn more about blurring faces in videoFrequently asked questions
Can I blur a video with iPhone's built-in tools alone?
The built-in Photos app offers trimming, colour adjustment and similar edits, but no way to blur or pixelate part of a video. You will need a separate app.
Does it work on Android?
MozFace is available on both iOS and Android, and the flow is the same on either.
Do I need a computer?
No. Importing, detection, blurring, and export all happen on the phone.
Do I have to upload the video?
No. All processing happens on the device, so there is no transfer at all and the app works offline.