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How to transform a WebM file to other formats and back

Edited by Ben Jacklin
11 253

WebM is one of the three formats supported by the HTML5 standard, so if you want to embed AVI, WMV, or MOV video on your web page, you may need to convert it to WebM. However, most mobile devices don’t support this format; to view a WebM video on your phone, tablet, or media player, you need to convert it to a more device-friendly format (for example, MP4). This guide is about WebM conversion and the main differences between WebM and other formats. Here, we’ll also answer some frequently asked questions. Please refer to the section you need via the appropriate link below.

How to convert videos to WebM and vice versa

Movavi Video Converter is a fast and easy way to convert your media files into any of the 180+ supported formats (MP4, AVI, FLV, SWF, OGV, WebM, etc.). Use this handy application to trim and resize your videos, even enhance their quality! Download the appropriate version of the software now and learn how to convert to WebM and back again with the help of the simple guide below.

Step 1. Install the converter

After downloading the application, open the setup file and follow the instructions on your screen.

Step 2. Upload the video files to the program

Click Add Media in the upper left part of the program window, select Add Video, and open the files you want to convert. The batch conversion feature makes it possible for the program to process multiple files simultaneously, so you can add multiple videos at once.

How to add files to the Movavi WebM converter

Step 3. Select the output format

If you are looking for a specific video format, click the Video tab in the lower part of the program interface, select the format you want, and choose the appropriate preset from the list. If you wish to convert your video for viewing on a mobile device, open the Devices tab and choose your device model.

How to select the target format to convert video to WebM

Step 4. Convert your video to WebM

Specify the folder in which the converted files will be saved. Click the Folder button (next to the Save to field) and choose an existing folder, or create a new one if you want. Once all the settings have been specified, hit Convert to start converting your files. The destination folder will open automatically after the conversion is complete.

How to convert video to WebM and save it

Now you know how to make a WebM from other formats or vice versa. Movavi Video Converter is a multi-talented tool that you can also use to create animated GIF images (for example, convert WebM to GIF) and even extract audio from video and save it in any popular format (MP3, WAV, AAC, and more).

The difference between WebM, MP4, MOV, AVI, and FLV

When choosing a video format, you need to take many things into account: compatibility with your devices, audio and video codecs, and file size, to name just a few. To make your job easier, we’ve compiled this table below.

Comparison parameter






File extension



.mov, .qt









Video codecs

VP8, VP9, AV1

H.263, H.264, H.265, MPEG‑4, others

H.263, H.264, Apple ProRes, Apple Pixlet, others

H.264, MPEG‑4, DivX, Xvid, others

Sorenson, VP6, Screen Video, H.264/MPEG‑4 AVC

Audio codecs

Opus, Vorbis

AAC, MP3, AC‑3, others

AAC, ALAC, MP3, others

Almost any

MP3, Nelly­moser, ADPCM, LPCM, AAC, Speex


Some browsers and players

Almost any device

Mainly Apple devices

Windows PCs

Browsers and players with Flash Video support

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Frequently asked questions

What is a WebM file?

A WebM file is a compressed video file inside the WebM wrapper, which was developed from the Matroska base. It can contain both audio and video streams. WebMs are mostly used on the internet to store videos on websites.

Do WebM files have sound?

WebM is a container so yes, it can include an audio stream encoded with Opus or Vorbis codecs.

How do I convert WebM to other formats on a Mac?

To convert a WebM file on your Mac, you can download the Mac version of Movavi Video Converter or use an online tool.

Follow one of the links below to proceed to the appropriate website.

Is WebM lossy?

Generally, yes, but it depends on the codecs. VP8 is a lossy codec, while VP9 supports lossless compression. Vorbis and Opus are both lossy codecs.

Can I upload WebM to YouTube?

Yes, you can. WebM is on the list of file formats supported by YouTube.

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