Does it detect faces automatically?

No. You place the box by hand over the area you want to hide. There is no AI face detection, which also means nothing about your video is analyzed on a server.

Does the blur follow a moving face?

No. The box stays in one fixed spot for the whole clip. It does not track a moving subject, so make the box large enough to cover the area as it moves, or trim the clip to a steadier section first.

What is the difference between blur, pixelate and black box?

Blur softens the area into a haze, pixelate turns it into large blocks, and a black box covers it completely. All three clearly hide the content.

Which one should I use for sensitive data?

Use a black box for anything truly sensitive like account numbers or IDs. A heavy blur or pixelation can sometimes be partly reversed, but a black box leaves nothing behind.

Is my video uploaded to a server?

Never. Everything runs locally in your browser. Your file never leaves your device.

Can I hide more than one area?

Each pass covers one box. To hide a second area, run the downloaded video through the tool again and place the box on the next spot.

Yes. Blurring a video on Sondra is free, with no signup and no watermark.

Can I blur a video on my phone?

Yes. Sondra works in mobile browsers, with files up to 100MB on mobile and 500MB on desktop.

What format is the output?

The edited video is saved as an MP4, which plays on virtually any device or platform.

Blur Part of a Video

Hide a face, license plate or any sensitive area in your video. Draw a box, pick blur, pixelate or a black box, free and right in your browser.

Drop a video here or click to upload

MP4, MOV, MKV, WEBM and more

Up to 500MB on desktop, 100MB on mobile

Fast 100% private Free

How to blur part of a video

Add your video

Drop in or pick the clip you want to edit. It stays on your device.

Cover the area

Drag the box over the face or detail, resize it, and choose blur, pixelate or a black box.

Download

Save your video with the area hidden, ready to share.

Why blur part of a video?

Sometimes a clip is fine to share except for one thing in frame: a bystander's face, a license plate, a house number, an ID card, or personal data on a screen. Blurring or covering just that area lets you post the video without exposing private information.

Sondra gives you three ways to hide an area. Blur smears it into a soft haze, pixelate breaks it into blocks, and a black box covers it completely. A black box is the safest for truly sensitive details like account numbers, because there is nothing left to recover. Blur and pixelate read clearly as hidden on purpose, which is what you want for faces.

You place the area by hand, so there is no AI guessing and nothing is sent to a server. It runs entirely in your browser. Drop in a clip, drag the box where you need it, and download the result.

What you can hide in a video

Covering a small area is the quickest way to keep a video private. Here are the most common cases.

Faces

Blur a bystander, a minor or anyone who did not agree to be filmed.

License plates

Hide a number plate before posting dashcam or street footage.

Personal data

Cover an ID, address, bank statement or email in a screen recording.

Logos and brands

Hide a logo or label on your own footage where you need it gone.

Share safely anywhere

A censored MP4 plays everywhere. A few notes for the most common cases.

YouTube and social

Blur faces and plates so you can post without exposing anyone.

Dashcam footage

Cover license plates before sharing an incident clip publicly.

Screen recordings

Use a black box over passwords, emails and account numbers.

Reports and evidence

Hide bystanders and IDs before a clip is released or filed.

Private by design

Blurring private details only makes sense if the video itself stays private. Most online blur tools upload your file to a server first. Sondra does not. All the work happens inside your browser on your own device, so the original, un-blurred video is never sent anywhere.

There is no account to create and no limit on how many videos you edit. Close the tab and nothing is left behind.