Blur faces and moving objects in your video
Choose a target, track movement automatically, and redact sensitive details. Your video stays on your device.
How it works
Choose your video
The video opens directly in your browser. Nothing is uploaded anywhere.
Select the target
Drag a box over the face or moving object you want to redact.
Track movement
Motion tracking advances the box across the timeline automatically.
The clip never leaves the tab
Trimming usually means handing a video to somebody else's machine and waiting for it back. Here the clip is opened by your browser, cut in place, and handed straight back to you. No request is made in between, so there is nothing to intercept and nothing left behind.
- Opened from your disk by your browser — not sent anywhere first.
- Held in the tab while the tool works, then dropped.
- Saved to your device by your browser, not by a link to a server.
- Closing the tab clears the working copy completely.
- No account, so nothing is ever attached to an identity.
- No tracking of what you worked on or what was inside the file.
There is no queue, no render farm and no waiting room. When the tab closes, the clip is released with it. There is a fuller walkthrough of how Filezaar works in the browser if you want the detail, or follow our DevTools guide to verify your file never leaves your device.
What people use it for
Pulling a highlight out of a long recording
A screen recording or a lecture is mostly waiting. Keep the section that shows the thing and drop the rest.
Preparing footage for a smaller screen
A shorter, lighter clip loads faster on a phone and is easier to pass on.
Rescuing a clip that will not open
When a phone produces a file an editor refuses, one conversion usually makes it openable everywhere.
Formats & limits
What this tool accepts, what it produces, and what it will never ask you for.
- Input
- MP4, MOV, MKV and WEBM
- Output
- Set in the controls above
- Maximum file size
- Set by your device, not by a plan
- Files per run
- One at a time
- Sign-up required
- None
- Watermark
- Never added
- Works offline
- Yes, once the page has loaded
- Supported browsers
- Any current Chrome, Edge, Firefox or Safari
When something goes wrong
Damaged files, and formats outside the list above, stop with a plain message rather than a spinner that never finishes. A clip that plays in your player will almost always open here.
The container or the video track is not one the browser can read. Try converting it to MP4 first, or use a different copy of the file.
Why not an upload site
An upload-based editor posts your clip to someone else's machine before it does anything. Take that step out and a lot of small annoyances disappear with it.
A typical upload site
This tool
Questions
Is my video uploaded to a server?
Never. Video decoding, tracking, masking, and encoding run entirely inside your browser on your device.
Does it leave a watermark?
No. Filezaar never adds watermarks, stamps, or branding to your exported files.
How long can the video clip be?
There is no artificial limit. Processing depends on your device's memory and processor speed.
Can I blur a licence plate or screen instead of a face?
Yes. The motion tracker works on any rectangular area — licence plates, faces, screens, or badges.
What if the tracking box drifts?
You can pause at any point, adjust the bounding box position or size, and resume tracking smoothly.
Is there a file size limit?
No fixed limit is imposed by the tool. The practical ceiling is how much memory your device has free, because the whole job runs inside this browser tab.