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MP4 to WEBM

Convert online and free MP4 to WEBM

Free: up to 750 MB per file (Premium: 20 GB)
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convert .mp4 to . webm
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4.4/5(8 votes)

WEBM is a modern video format that was developed specifically for use on the web. Compared to MP4, WEBM achieves significantly smaller file sizes with the same image quality: ideal for websites, apps and all applications where fast loading times are important.

Why WEBM instead of MP4?

WEBM uses modern codecs such as VP8, VP9 or AV1, which can encode more efficiently than the H.264 commonly used in MP4. Depending on the source material, savings of 20-40% are possible with similar quality. WEBM was developed by Google and is optimised for fast streaming. All modern browsers now support the format natively (without plugins). In addition, the codecs used in WEBM are completely licence-free.

Tabular comparison: WEBM, MP4 (and MOV)

WEBM MP4 MOV
Developer Google ISO/MPEG Apple
Typical codecs VP9, AV1 H.264, H.265 H.264, ProRes
File size Small Medium Large
Browser support Very good Very good Limited
Device support Limited Very good Apple devices
Licence-free Yes No No
Optimised for Web, streaming Universal Video editing, Apple
Introduced 2010 2001 1991

(.MOV was introduced as Quicktime in 1991, and MP4 is also technically based on the Quicktime format.)

4.4/5(8 votes)

Last updated on 28. February 2026 by Sören with the experience of more than 128,070,524 converted files since 2013.

How to convert MP4 to WEBM online?

  1. Upload MP4 file Choose your MP4 file with the "Choose File" Button, Drag & Drop or import it directly from Dropbox/Google Drive.
  2. Choose target filetype WEBM is set as default target format. Change it if you need a different target filetype for your conversion.
  3. Start Conversion Click "Start Converting!". Most files process in seconds, only the largest files may take a few minutes.
  4. Download your WEBM file Download your finished WEBM file. Your files will be automatically deleted from our servers.

Information about the extensions for the conversion from MP4 to webm

From: MP4

MP4 is a container format that can include multimedia content such as video and sound tracks, graphics, 2D and 3D animations, subtitled texts, interactive applications in the form of menus, and much more. Despite the strong compression, a file in MP4 …

File extension: .mp4
More information and converters for MP4

To: webm

WEBM is a file format for playing videos and music, similar to other video files like WMV and MP4. Specifically, WEBM is a container format for audio and video files with the file extension .webm. WEBM was specially developed for use on the Internet …

File extension: .webm
More information and converters for webm

Frequently asked Questions

Depending on the source file, the WEBM video will be approximately 20-40% smaller than the MP4 file with comparable quality. For high-resolution 4K videos, this is usually even more.
Some quality is lost with every conversion between lossy formats. In practice, the difference will be almost imperceptible with our settings.
Currently, all modern browsers support WEBM, including Apple's Safari since 2020.
During conversion, the audio portion of the video is converted to Opus format. Opus offers very high quality (usually slightly better than MP3) while still enabling small file sizes.

Video-Tutorial: MP4 to WEBM

File-Converter-Online.com converts your files for free – no registration, no installation, no watermarks. Works on any device - Windows, macOS, Linux, Android and iOS. The free version supports files up to 750 MB, with Premium up to 20 GB. Our servers are located in Germany, all files are encrypted during transfer and automatically deleted after conversion. Since 2013, we have converted over 128,070,524 files - if you have any questions or issues, you can reach us anytime via the contact form.

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