MP4 to WebM Converter

Convert MP4 video to WebM for publishing on a website or embedding in a web app

No software installation • Fast conversion • Private and secure

1K+
users
46K+
conversions

Converters from MP4

MP4 to 3GPMP4 to AACMP4 to AVIMP4 to FLACMP4 to FLVMP4 to GIFMP4 to M4AMP4 to MKVMP4 to MOVMP4 to MP3MP4 to OGGMP4 to OPUSMP4 to WAVMP4 to WMV

Converters to WEBM

AVI to WEBMMKV to WEBMMOV to WEBM

When you need MP4 to WebM

WebM is an open format for video in the browser. It was built specifically for the web: it is supported in Chrome, Firefox, Edge, and Opera without any extra conditions. Safari supports WebM starting from newer versions.

If you are embedding video on a website through the <video> tag, WebM is a logical choice as the primary format. It is usually more compact than MP4 at comparable quality, which means faster page loading. At the same time, keeping MP4 as a fallback for maximum compatibility is still a good idea.

WebM is also needed if you are making a video sticker with a transparent background: unlike MP4, WebM supports transparency - this is used, for example, in Telegram stickers.

Important to understand: WebM is not a universal format. On regular TVs, in media players, or when sending files to other people, it works worse than MP4. Its niche is websites and web apps.

What changes after conversion

During conversion the video is fully re-encoded: both the video and audio tracks change. This means quality depends on the source - a poor MP4 will not give a good WebM. The file size will generally be smaller than the original, which is useful for web publishing.

WebM does not support multiple audio tracks and embedded subtitles in the usual sense - if MP4 had them, they will most likely not carry over after conversion.

When this is especially useful

  • Video is being embedded on a website and the file weight needs to be reduced for fast loading.
  • Background video on a landing or promo page where size is critical.
  • A video sticker with a transparent background for Telegram or a web app.
  • The project uses only open formats without licensing restrictions.

Common tasks and search situations

  • convert MP4 to WebM for a website;
  • smaller background video for a website;
  • video for HTML5 in WebM format;
  • make a WebM for the video tag on a website;
  • Telegram video sticker with transparent background;
  • mp4 to webm for a landing page;
  • reduce video for uploading to a website.

What to check before converting

  1. Make sure WebM fits your specific task: for a website - yes, for a TV or personal storage - no.
  2. Assess the quality of the source MP4: conversion will not improve it.
  3. If maximum browser compatibility matters, keep the MP4 version as a fallback.
  4. Test the finished WebM in several browsers if the site needs to work everywhere.

Format and conversion limits

WebM is designed for browsers, not home devices. Most TVs, standard media players, and mobile apps not related to the web will not open it. For personal storage or passing files to other people, WebM is inconvenient.

Converting from MP4 to WebM is full re-encoding, not a simple container change. So it takes more time than converting between similar formats.

If the file is damaged or protected, conversion may not complete.

Related tasks

If you need video for a media library or home theatre - MP4 to MKV. For editing on Mac - MP4 to MOV. If the device only understands old formats - MP4 to AVI.

What is MP4 to WEBM conversion used for

Video on a landing or promo page

A clip for a website is converted to WebM so the page loads faster. A smaller file means less waiting for visitors.

Website background video

Background video clips are critical for loading speed. WebM is usually more compact than MP4, which matters for performance metrics.

Video sticker with transparent background

For animated stickers in Telegram or overlays in web apps, WebM with transparency is needed - MP4 does not support transparency.

Open format for a web project

If a project uses only open formats on principle, WebM is a suitable choice for video on a website.

Server traffic optimization

Compact WebM files reduce the volume of delivered traffic, which matters with a large number of visitors.

Tips for converting MP4 to WEBM

1

Keep MP4 as a fallback

For a website, use both formats: WebM as the primary and MP4 for browsers where WebM is not supported. The video tag allows specifying multiple sources.

2

WebM does not replace MP4 for storage

For personal archives or passing files to others, keep MP4 - it is compatible with far more devices.

3

Test in a browser, not just on a computer

Make sure the finished WebM plays correctly in the browser it is intended for.

Frequently Asked Questions

Why convert MP4 to WebM if MP4 also works in the browser?
WebM is usually more compact than MP4 at comparable quality - a page with such video loads faster. Also, WebM is an open format without licensing restrictions, which matters for some projects.
Will the video improve after converting to WebM?
No. Quality is determined by the source MP4. Conversion re-encodes the video but does not improve the picture.
Will WebM open on a TV or in a media player?
Unlikely. WebM is supported by browsers, but most TVs and home players cannot read it. For playback on a TV, use MP4 or AVI.
Should I keep MP4 alongside WebM on the website?
It is recommended. WebM is supported by all modern browsers, but for maximum compatibility it makes sense to also keep MP4 as a fallback.
Can a WebM with a transparent background be made?
Yes, WebM supports transparency, which is needed for video stickers. The source file must also contain transparency - it cannot simply be added during conversion.
Why does converting to WebM take longer than to other formats?
When converting to WebM, the video is fully re-encoded using more complex algorithms than MP4. This requires more computing, but gives a compact result.
Can I convert multiple files at once?
Yes, you can upload multiple MP4 files. Each will be converted to a separate WebM.