About the Blur Part of Video
Blur Part of Video hides one rectangle of the picture. You say where the rectangle sits, as a percentage of the picture from the left and the top, and how wide and tall it is, then choose a blur, pixelation or a solid black box. You can limit the effect to certain seconds. A small preview shows the exact area before you start. Typical uses are hiding a face, a car number plate, a name tag, an address or your own old logo. The video is processed in your browser and never uploaded.
Updated October 2026
How to use the Blur Part of Video
- 1Select your video.
- 2Enter the area to hide: how far from the left and top, and its width and height, all in percent.
- 3Look at the small preview to check the box is in the right place.
- 4Choose Blur, Pixelate or Black box, and set the start and end times if needed.
- 5Press Hide the area, watch the preview and download the video.
Blur, pixelate or black box
Blur smooths the area into a soft smear, which looks natural for faces and backgrounds. Pixelate turns it into large blocks, the classic censor look. Black box is the safest because nothing of the original is kept in that area, and it is the right option for text, numbers and anything private.
- Blur: faces of bystanders, backgrounds
- Pixelate: clearly censored areas
- Black box: card numbers, addresses, passwords, anything private
Placing the box
The four boxes describe the rectangle in percent of the picture. From the left and From the top set its upper left corner, and Width and Height set its size. The left plus the width must stay within 100, and the top plus the height as well. Start with a roughly right position, look at the preview, and nudge the numbers by a few percent at a time.
Timing
By default the area is hidden for the whole video. If a number plate is only visible between 0:12 and 0:20, type those times so the rest of the video stays untouched. Times can be plain seconds, such as 12, or minutes and seconds, such as 0:12.
Privacy and good practice
Blurring people's faces or number plates before sharing a video is a good habit and in some places a legal expectation. Check your result by playing it at full size before you share, especially the start and end of the time range, and keep the original file in case you need to redo it. Everything stays on your device while you work.
Other edits that go with it
Use Crop Video if you would rather cut an unwanted edge off than hide it. Add Text to Video places a new caption where the old one was, and Mute Video removes sound that gives away a conversation. For a single photo, use Blur Image, and Video Compressor makes the finished video smaller.
Features
- Blur, pixelate or solid black box
- Position and size set in percent, with a live preview box
- Hide for the whole video or only a chosen time range
- Sound is kept
- MP4 or WebM output
- No upload, no watermark
Frequently asked questions
Is blur safe for hiding sensitive details?
A heavy blur or pixelation hides most things from the eye, but it is not proof against clever recovery of text or numbers. For passwords, card numbers or anything that really must not be read, use the Black box option, which replaces the pixels completely.
Does the box follow a moving face?
No. The area stays in one place for the time you choose. For a moving subject, make the box large enough to cover where it goes, or hide it in short time ranges by running the tool more than once.
How do I work out the numbers for the box?
Think of the picture as 100 across and 100 down. A logo in the top right corner might start at 75 from the left and 4 from the top and be 22 wide and 10 tall. Watch the preview box and adjust until it covers what you need.
Can I remove a watermark with this?
It can hide a logo or text that belongs to you or that you have permission to cover. It does not rebuild what was underneath, so a covered area stays blurred or black. Do not use it to take credit for someone else's work.
Can I hide the area only for a few seconds?
Yes. Fill in Hide from and Hide until. Leave Hide until empty to keep it hidden to the end.
Can I hide several areas?
One area per run. To hide more, run the tool again on the result with a new area.
Does it change the sound?
No. The sound is kept, though the file is encoded again, so the sound is saved afresh as well.
Is my video uploaded?
No. The blur is drawn on your own device by your browser.