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How to Blur a Still or Moving Part of Video

Ollie Mattison
Ollie Mattison
Originally published Mar 17, 22, updated Feb 29, 24
Create High-Quality Video - Wondershare Filmora

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Adding a blur effect to your video is vital, especially if you have added unwanted things that could ruin its quality. It often looks awkward when there's something wrong in the background of your video. Various video editing programs allow you to blur a moving or still part of your video if you don't want viewers to see it. With that in mind, we'll look at how to blur part of a video using Filmora.

There are several ways you can blur part of a video. Filmora allows you to blur a still and moving part of a video. The software is user-friendly and comes with an aesthetically pleasing interface. You don't have to be tech-savvy to learn how to blur out part of a video with Filmora. You can also use OpenShot to blur part of a video.

How to Blur a Part of a Video Using Filmora

Both Mac and PC owners can use this video editing software to blur part of a video. Here is how to blur a part of video using Filmora.

  1. Download and install Wondershare Filmora on your device. If you had already installed Filmora on your computer, double-click the program to launch it.
  2. Next, you need to drag and drop the video file you wish to blur into the Media Library. Alternatively, you could also navigate to the File tab and click it, then choose Import Media and select the Import Media Files option. Find the video you want to edit and select it. You can now hit the Open button to import the video file to Media Library
  3. After your video file is on Filmora's Media Library, drag and drop it into the Timeline; this is where the program allows you to assemble effects and media files for your video project.
blur a part in a video using filmora
  1. Click on the Effects tab; this will allow you to browse through Filmora's collection of visual effects. Select Utility on the drop-down menu located on the left side of your screen.
blur a part in a video - filmora
  1. The program will display a range of effects; select the Mosaic option. You can also type in Mosaic in the search bar to find the effect swiftly.
  2. Drag the Mosaic effect to above the video clip on your Timeline. Dragging the border of your Mosaic clip allows you to adjust its length.
  3. A small blurred area will appear in the preview window.
blur a part using Filmora - choose mosaic
  1. Lock the main tracks.
  2. Now, click the Mosaic layer to modify the Mosaic size and area. Move it to the part of the video that you would like to blur.
  3. Double-clicking on the Mosaic clip will allow you to change the mosaic type and adjust the opacity and blur amount. You can choose from six different Mosaic types. Adjusting the opacity allows you to set the degree to which you can see through the blurred area. The blur amount lets you control the intensity of the blur.
blur a part using Filmora - adjust blur area
  1. You can now save your blurred video. Click on the File tab and select 'Save Project.' Doing this will save your project to the default file. Choose 'Save Project As' to save your video to another destination of your choice.

How to Blur a Moving Part of a Video Using Filmora

You can also blur a moving part of your video with Filmora; this program allows you to add the motion-tracking mosaic to any moving object in your video that you do not want your viewers to see. You can use stickers, mosaic, or anything you download on the internet to hide any unwanted moving object.

With that in mind, here is how to blur a moving part of a video using Filmora:

  1. Run Filmora on your device.
  2. Import your video into Filmora's Media Library.
  3. Drag your video to the Timeline.
how to blur a moving part in video with filmora
  1. Now, double-click the video in the Timeline. Doing this will open the editing menu.
  2. Check the box that's right next to Motion Tracking; this tool allows you to track movement in a video and then have objects like text, images, videos, or elements follow this movement.
how to blur a moving part in video with filmora - motion checking
  1. A tracker box will appear on your preview window; move it over the moving object you would like to track. You can increase or reduce the size of the tracker box. Hit the Start Tracking button to render the effect.
how to blur a moving part in video with filmora - tracker box
  1. Wait until the tracking process is complete. The duration of this process will depend on the length of your video. You'll have to do some trimming if other objects block the moving part you're tracking from time to time.
how to blur a moving part in video with filmora - complete checking
  1. WNow, select the Add Mosaic option.
  2. Choose the Mosaic type you prefer and adjust the opacity and blur amount to ensure the object is unrecognizable.
  3. Now, select the moving part of the video you want to blur and click OK.
  4. The object is now blurred, and the mosaic layer will follow its movement everywhere it goes.
  5. Playback your video to check the result. Filmora allows you to fine-tune the position and size of the object that's following the track in your Preview Window without restarting tracking. Additionally, you can switch the follower anytime you want.
  6. When you have finished blurring the moving part on your video, click File > Save Project or Save Project As to save your video.

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How to Blur Part of a Video Using OpenShot

Designed for Windows, Mac, and Linux, OpenShot is a free, open-source, and cross-platform video editor. While there's no predefined function or filter in this tool to help you blur part of a video, OpenShot has another way of blurring static parts of your video: it uses an image.

OpenShot blur part of video is free, and you'll use its open-source programs as a base program for the edition of the video and GIMP Image Manipulation software to edit photos. Follow the guide below to learn how to blur out something in a video using OpenShot.

Step 1: Download OpenShot and install it on your device.

blur part of a video using openshot

Step 2: Take a screenshot from your video, where the part you want to blur is easily visible. You can do this by going to a relevant frame and utilizing Save Current Frame with a camera icon, located on the right side of the video preview window in a standard program configuration.

blur part of a video using openshot

Step 3: Be sure to save your video screenshot on your computer.

Step 4: Since you have exported a relevant frame from your video as a screenshot, you need to open it in a photo editor that can handle PNG pics and transparency, like the GIMP Image Manipulation program. Use any selection tool to select the area of the picture you want to blur on the video. Depending on your preferences, you can choose the free select tool, the ellipse select tool, or the rectangle select tool.

blur part of a video using openshot - select blur area

Step 5: In the blur filters submenu, open the Pixelize tool and adjust the options that suit your preferences. You can use CTRL-Z to cancel the operation, and repeat it until you find the best combination of blurring settings.

Step 6: When you are satisfied with blurring, right-click on the blurred area and select Invert in the Select submenu; this will allow you to select the entire part of the frame that has not been blurred, which is the part you would like to get rid of because you will only have to use the blurred part of your video overlay where necessary.

Step 7: Now, cut the section of the picture you do not want to keep. You can do this by using CTRL-X. The blurred filter for your video is now ready.

blur part of a video using openshot - cut unwanted section

Step 8: If after cutting you notice a plain color rather than a checkerboard canvas representing transparency, use CTRL-Z to cancel the cut. Then, use CTRL-I to invert the selection again to get control of the blurred selection again, and copy or cut it using CTRL-X or CTRL-C.

Step 9: Create another image using CTRL-N, and ensure you have navigated to the advanced options and selected transparency as the fill-in color, and paste your selection there.

Step 10: You now have a perfect photo with full transparency, which is represented by a checkerboard canvas, except for the section of the video frames you would like to blur that should be pixelized.

Step 11: Use the Export option under the File menu to export the photo to your PC as a . PNG file. To save a picture with a transparency channel, you need to use the . PNG extension.

Step 12: Now return to OpenShot video editor and import the generated picture with a pixelized portion in the OpenShot video project. Next, add the picture as an overlay track. Make sure it's above the video track.

Step 13: If the program asks you to import the photo as an image sequence, select the NO option because you need to import a still photo, and not a video sequence.

Step 14: The picture will be displayed before the video, blurring only the portion of the video where you modified the frame. The other parts of the video won’t be touched. You can make adjustments to ensure the picture track is only displayed at required moments. And that's how to blur part of a video using OpenShot.


● Now that you know how to blur out part of a video, you can have fun and censor anything you want in your clips. Use Filmora to blur moving and still parts on your video.

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