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?

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

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Currently we support the following conversions with MP4 files:

All Converters

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

How much smaller will my file be?

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.

Is quality lost during conversion?

Some quality is lost with every conversion between lossy formats. In practice, the difference will be almost imperceptible with our settings.

Which browsers support webm?

Currently, all modern browsers support WEBM, including Apple's Safari since 2020.

What happens to the sound during conversion?

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.