Blur part of a video
Draw a box around the face, license plate or text to hide, choose blur or pixelation, for the whole video or between two points in time, then export an MP4 with the original audio. Your video never leaves your device.
- Blur or pixelate
- Multiple areas
- Adjustable start and end
- Audio kept
100% private — Everything is processed directly in your browser: your files, voice, and image are never sent to Chatzam's servers.
How do you blur part of a video?
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Upload the video
Drag your video into the drop zone or select it on your device.
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Box what needs hiding
Draw a rectangle over each face, license plate or piece of text, then move or resize it. Choose blur or pixelation and set the strength.
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Set the timing and export
Apply the effect to the whole video or between a start and end set to the second, then download the MP4, audio included.
Simple video blurring, nothing to install
Blur or pixelate
A subtle blur for a face in the background, heavy pixelation for a license plate or text. The strength is adjustable.
Multiple areas
Draw as many rectangles as you need, then move and resize them to cover exactly what should be hidden.
On a specific section
Apply the blur to the whole video or only between two points in time, adjustable to the second. The original audio is kept.
Processed locally
The video is processed by FFmpeg right in your browser, then exported as MP4: it's never uploaded to a server.
Why blur faces or license plates in a video?
Privacy rules vary from country to country: filming in public is often allowed, but publishing footage in which people can be identified can raise privacy issues, and platforms such as YouTube let people ask for a video to be removed when it shows them without their consent. Before posting dashcam footage, a vlog filmed in the street or a school event, blur the faces of strangers and children. License plates deserve the same treatment: a visible plate can be copied to make cloned plates, which then rack up tickets and tolls in someone else's name. Also watch out for what's lying around in the frame: an address on a package, a computer screen, a phone notification, a name on a mailbox or an ID badge.
Blurring a moving face with fixed areas
The areas in this tool are fixed: they don't automatically follow a face or a car that moves. For a subject that barely moves, such as a seated person or a parked car, simply draw an area larger than needed. For a subject that crosses the frame, work in passes: blur a first area from 0 to 5 s, export, re-import the resulting video and add a second area from 5 to 10 s, and so on. Each export re-encodes the video, so keep the number of passes low. Another method: cut the video into pieces with “Cut / Trim Video”, blur each piece, then join them back together with “Merge Videos”. Always check the result at the moments when the subject moves.
Blur or pixelation: which effect for which area?
Blur gives a subtle look, suited to a face in the background or scenery. But on a license plate or text, a light blur can sometimes let the characters show through, especially when their shape is well known. For text, numbers or a license plate, go for strong pixelation, with big squares, and an area that extends well beyond what needs hiding. Before posting, watch the exported video full screen and pause it at the key moments. The audio is kept: if you can hear a voice, a name or an address, remove the soundtrack with “Remove Audio From Video”. For a single photo, “Blur Image” is faster.
Frequently Asked Questions
How do I blur a face in a video?
Upload the video, draw a rectangle over the face, choose blur or pixelation and turn up the strength. If the person moves, make the area larger or process the video in several passes.
How do I blur a license plate in a video?
Draw a box around the plate with some margin, choose strong pixelation and limit the effect to the section where it's visible. For a moving car, work in successive passes, since the area doesn't follow the vehicle.
Can the tool automatically track a moving face?
No, the areas are fixed. Draw a larger area, or process the video in several passes with an area suited to each one.
Is the video's audio kept?
Yes, the original soundtrack is kept in the exported MP4. To remove it, run the video through “Remove Audio From Video” afterwards.
Is my video uploaded to the internet?
No. The blurring is done by FFmpeg in your browser: the video stays on your device. The tool is free, with no sign-up.