Cover a face or a plate on a video
- Blocks or a blur, every frame
- Sound survives
- Processed by your own browser
Draw a box over what has to disappear and every frame renders with blocks or a blur baked into that spot. Sound survives, the rest of the picture survives, and the clip is processed by your own browser rather than by anyone’s server — the only sane arrangement for footage sensitive enough to need censoring.
Boxes, not guesswork
Cover exactly the regions you mark and not a pixel more — no auto-detection deciding for you what counts as sensitive.
Check any moment
The covered area holds still while the video moves. Scrub along the video to make sure the box still covers it later, before you spend the render time.
Rendered on your hardware
The footage is decoded, covered and re-encoded in the browser tab, so it exists in one place throughout: your machine.
Free without an asterisk
Full length, full resolution, no stamp in the corner and no login gate — page advertising keeps the lights on.
How it works
- Load a clip — drop it in or browse for it.
- Box in whatever must go: draw with a drag, adjust by pressing a box and pulling its body or corners, add more boxes as needed.
- Slide along the video to check other moments — the areas stay where you drew them, so make sure what you are covering stays inside.
- Pick Blocks or Blur, and set the block size if you want one size everywhere. The picture updates as you look at it.
- Press Cover and download, wait for the re-encode, and save the MP4.
The area stays put — that is the deal
This tool does not track faces or follow movement. The box you draw covers the same part of the frame from the first second to the last. That is simpler to trust than tracking, which can lose its target for a few frames without telling you — but it means the box has to be big enough to hold whatever you are covering for the whole video. The slider under the picture exists for exactly that check, and it costs nothing: scrubbing changes which frame you are looking at, not the areas.
Blocks or a blur
Blocks keep the shape and the colours of the video, so the result still looks like a video with something covered in it. Each block is the average of what it covers, and the size row under the picture fixes the block size if you want the same weight everywhere — the sizes on offer are read off your own video.
A blur is the gentler look: no hard squares, just a smudge. It is also the softer of the two, because smearing spreads what was there across the neighbouring pixels rather than throwing it away. At the same setting a blur reaches a little further up the letter heights than blocks do, so the note under the size row is on the cautious side for it.
What you get back
An MP4 at the same width and height, with the sound kept. Baking the cover into the frames means re-encoding the whole video — that is why it takes real time, and why the tool says so before you start rather than after. Your device’s own encoder does the work when it can; HDR video and unusual audio go through the slower software engine so their colours and sound are not quietly mangled.
Frequently asked questions
Does the covered area follow a face when it moves?
No. The area you draw stays where you drew it for the whole video — it does not track what is underneath. Use the slider under the picture to check other moments: if the thing you are covering moves out of the box, draw the box bigger so it stays inside. Nothing is covered outside the boxes you draw.
Can the covered part be brought back?
Blocks replace each area with an average, so less is left the bigger the blocks are. A blur only smears it — the original is still spread across those pixels, and smearing is the easier of the two to work backwards from. There is published work on reconstructing pixelated text, and we have not measured it on video, so we will not tell you a mosaic cannot be undone. Draw the box with some margin, and prefer blocks when it matters.
Why does it take so long?
Every frame of the video is redrawn with the cover on it and then encoded again — that is the honest cost of changing the picture. Your device’s own hardware encoder does the work when it can, which is reasonably quick; files it cannot serve (HDR video, unusual sound) go through a slower software engine. A progress bar shows where it is.
Can I cover several things in the same video?
Yes — a face in one corner and a licence plate in another are two boxes, each covering its spot for the whole running time. Every edit can be stepped back with Undo (Ctrl+Z, ⌘Z on a Mac) and forward again with Redo, so experimenting costs nothing before the render.
The box is slightly off. Do I have to redraw it?
No — select it with a press and adjust: its inside drags it around, its corners stretch it, and Remove area or the Delete key discards it. Scrub to a few different moments while adjusting, since the box that fits at 0:02 may need widening for what happens at 0:40.
Does it work on a phone?
Yes, and phone clips are the usual customers here. Finger drags draw and adjust boxes without the page scrolling underneath, and the handles accept an imprecise touch. The encode itself leans on the phone’s hardware, but a long clip is still real work — keep the page in the foreground until the download appears.
Does the video leave my device at any point?
At no point. Decoding, covering and re-encoding all happen in your browser, which you can prove by going offline mid-render and watching it complete. A clip that needs a face hidden is precisely the clip that should never touch a stranger’s server.
What do I get back?
An MP4 at the size the video came in, with the sound kept. The video is re-encoded to bake the cover into every frame, at a quality set high enough that the change is not the thing you notice.
What does this cost, and where is the catch?
Nothing, and there is none to find: no login wall before the editor, no logo stamped into the corner, no resolution held hostage by a paid tier. Page ads fund the hosting, and the render itself spends your device’s electricity, not our server budget.