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How to transform a WebM file to other formats and back

Edited by Ben Jacklin

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.

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.

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.

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

Here’s what Movavi’s team does to provide you with verified information:

  • When selecting products to include in our reviews, we research both demand and popularity.

  • All the products covered in this article have been tested by our team.

  • When testing, we compare key characteristics, including supported input and output formats, quality loss when converting, and other significant features.

  • We study user reviews from popular review platforms and make use of this information when writing our product reviews.

  • We collect feedback from our users and analyze their opinions of Movavi software as well as products from other companies.


Frequently asked questions

What is a WebM file?

Do WebM files have sound?

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

Is WebM lossy?

Can I upload WebM to YouTube?

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