VideoProc Converter

Convert MOV to WebM with Alpha Channel

  • Compatible with both Windows and macOS
  • Lightning-fast conversion speed with GPU acceleration
  • Visible estimated file size before converting (4MB or less is possible)
  • Toolbox: media conversion, compression, downloading, editing
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Watch Video Tutorial - Convert MOV to WebM

How to Convert MOV to WebM on Windows/Mac

By Cecilia Hwung | Last Update:

WebM is an open, high-quality video standard. It is commonly used for delivering online videos using the HTML5 tag. This format is supported by nearly all search engines, online video platforms, and some media player, for example, Google, Mozilla Firefox, Opera, YouTube, VLC. WebM is build to use VP8/VP9 video codec and Opus/Vorbis audio codec, a quality harmless way for compression. However, by comparison, MOV is an MPEG4 video file format developed with Apple's proprietary compression algorithm. So most MOV files are running on Apple devices and applications. Besides, MOV files are lossy compression format, which means that parts of the MOV file are trimmed to result in a smaller file size.

And these are the reasons why we need to convert MOV to WebM. To make it, you can follow 3 methods by using different video converting software. Each of them is with detailed steps.

If you want to convert MOV to WebM with alpha channel to keep the transparency, so that you can use the transparent WebM as overlays for OBS and Streamlabs, you can resort to method 1 below.

Method 1. How to Convert MOV to WebM with VideoProc Converter

VideoProc Converter is a powerful one-stop video processing software, and it works perfectly as an easy-to-operate MOV to WebM converter. No quality loss will occur while converting. Moreover, you don't have to wait long. The process will be finished in no seconds. Follow the steps below to convert MOV to WebM with VideoProc Converter.

WebM videos are usually encoded with VP8 or VP9, and VideoProc Converters supports both of the codecs, with transparency information when applicable. If the original MOV video has an alpha channel, converting it to WebM using VideoProc Converter will help you preserve transparency easily.

VideoProc interface
VideoProc Converter interface

Step 1. Download and install this software on your Windows or Mac computer.

Step 2. Add MOV file to the converter. In the editing interface under Video card, move to the +Music column in the upper bar. You can add music file to the list either by clicking the +Music button to open up MOV files or simply drag and drop the MOV file onto the panel.

Convert MOV to WebM in VideoProc
Convert MOV to WebM in VideoProc Converter

Step 3. Convert MOV to WebM. After adding MOV files, you can batch convert them to WAV files by selecting WebM format.

By default, the WebM profile in VideoProc Converter uses the VP8 codec for best compatibility. If you need VP9, you can click the gear-shaped Codec Option, and switch to VP9 under the Video Codec menu.

Tips: Videos that contains alpha channel (transparency) can be identified by color space info from metadata. For instance, the RGBA or YUVA color space, where A stands for the alpha channel. To check the metadata of a video, you can simply click the information icon (i) in VideoProc Converter after importing the MOV videos.

Step 4. Run the conversion process. Click the RUN button on the bottom right corner to start the MOV to WebM conversion in batch or individually.


If you cannot find the WebM format in the "Target Format" bottom bar, click on the "+" button and search out WebM format.

Here's more what VideoProc Converter can do for you:

  • Convert MOV videos to other compatible formats, like MP4, AVI, MKV.
  • Shorten a video, chop away unwanted segments, rearrange clips in a new sequence and optimize size for YouTube.
  • Merge multiple video files even they are in different formats.
  • Add visual effects and filters like grayscale, mirror, edge, painting to your video tracks.

Video Tutorial

Timestamp for Video Tutorial:
00:37 Introducing the MOV to WebM converter
00:52 3 steps to convert MOV to WebM
02:00 Customize WebM video settings
02:15 Choose VP8 or VP9 video codec for WebM

Method 2. How to Convert MOV to WebM in VLC Media Player

The VLC media player is a free and open-source portable cross-platform media player software, but it can also lend you a helping hand to convert MOV to WebM. Below are the detailed steps.

Step 1: Run VLC, and from the menu bar, click Media, then Convert/Save.

Step 2: Click on "Add" button to import a MOV file to be converted.

Step 3: Click on "Convert/Save" button to arrive at the Convert page.

Step 4: Under Settings > Profile, select WebM in the drop-down menu.

Step 5: Choose the destination and click on Start button to convert MOV to WebM.

Convert MOV to WebM in VLC
Convert MOV to WebM in VLC

Method 3. How to Convert MOV to WebM Online

CloudConvert is a reliable online video converter, which makes the converting process quick and easy. All you have to do is uploading and waiting. Besides MOV files existing on your computer, it also supports videos on Dropbox, Google Drive, OneDrive, Box, even online videos. The problem is CloudConvert just don't offer you any editing features. Here is how to convert MOV to WebM using CloudConvert.

Step 1: Search for CloudConvert. On your device, go to the official website of CloudConvert.

Step 2: Upload MOV to CloudConvert. Click on "Select Files" to locate the MOV file that you want to convert to WebM. Hit the drop-down arrow next to this option if you want to upload the file from other sources like Box, Dropbox, Google Drive or other URL.

Upload MOV to Cloudconvert
Upload MOV to CloudConvert

Step 3: Convert MOV to WebM. When the file is uploaded, check if the output format is selected as WebM. If it is not, click on the drop-down arrow next to the file name to choose an output format. Finally, hit "Start Conversion".

Convert MOV to WebM with Cloudconvert
Convert MOV to WebM with CloudConvert

Final Thoughts

Batch converting MOV to WebM online could be very slow, while converting video formats in VLC can be limited to certain choices. VideoProc Converter provides the most stable and fast conversion experience with wide output/input format choice for format conversion heavy and high-end users.

About The Author

Cecilia Hwung is the marketing manager of Digiarty Software and the editor-in-chief of the VideoProc team. She pursues common progress with her team and expects to share creative content and useful information with readers. She has a strong interest in copywriting and rich experience in editing tips.

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VideoProc is a primary branch of Digiarty Software that is a leading multimedia software company founded in 2006. It endeavors to provide easier hardware-accelerated video audio editing and conversion solutions. The installed base of the VideoProc product has reached 4.6 million units from 180 countries since its release 5 years ago.

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