Why convert MP4 to WebM?

WebM is the native open video format for the web. It plays directly in the HTML5 video tag across Chrome, Firefox and Edge, relies on royalty-free VP8 and VP9 codecs with no licensing fees, and usually compresses the same clip smaller than H.264 MP4, so your pages load faster and use less bandwidth.

Will WebM play on every browser and device?

It plays in every modern desktop and Android browser. Support on Safari, iPhones, older smart TVs and hardware media players has historically lagged, so for a public website the common practice is to offer a WebM source with an MP4 fallback inside the same video tag.

Is WebM really smaller than MP4?

Usually yes. At the same visual quality VP9 typically produces a file 20–40% smaller than H.264, which is why streaming sites use it. The exact saving depends on the footage — high-motion clips compress less than a static talking-head video.

Does WebM support transparency?

Yes, and this is a key reason to convert. WebM with VP9 can store an alpha channel, so a video with a transparent background stays transparent — something the standard MP4/H.264 format cannot do. It is popular for overlays and animated web graphics layered over a page.

What happens to the audio track?

The audio is re-encoded to a royalty-free codec — Vorbis or Opus — that pairs with WebM. The soundtrack stays in sync at its original quality; only the codec and container change, not the video timing.

Will converting reduce the video quality?

The output keeps the original resolution and frame rate. Because it is re-encoded there is a small generational loss, but at the high-quality settings used here it is not visible at normal viewing sizes.

Should I use WebM or stick with MP4?

Use WebM when the video lives on a website and you control the player — to save bandwidth or to keep transparency. Keep MP4 for maximum compatibility: sending a file to someone, uploading to social platforms, or playing on Apple hardware where WebM support is weaker.

Convert MP4 to WEBM Online

Convert MP4 to the open WebM format for royalty-free HTML5 video in any web browser.

or drag & drop them here · images, video, audio and documents · up to 2 GB

How to convert MP4 to WEBM

Click "Choose Files" and select your MP4 file, or drag & drop it onto the page.
Make sure WEBM is selected as the target format.
Click "Convert" and wait a few seconds.
Download your new WEBM file.

Why Converters.live?

Free and unlimited — convert as many MP4 videos to WEBM as you need, no daily limits.
Files up to 2 GB, processed with the same FFmpeg engine professional tools use, keeping video and audio in sync.
Your video files are deleted from the server immediately after conversion — nothing is stored.

Frequently asked questions

Why convert MP4 to WebM?: WebM is the native open video format for the web. It plays directly in the HTML5 video tag across Chrome, Firefox and Edge, relies on royalty-free VP8 and VP9 codecs with no licensing fees, and usually compresses the same clip smaller than H.264 MP4, so your pages load faster and use less bandwidth.
Will WebM play on every browser and device?: It plays in every modern desktop and Android browser. Support on Safari, iPhones, older smart TVs and hardware media players has historically lagged, so for a public website the common practice is to offer a WebM source with an MP4 fallback inside the same video tag.
Is WebM really smaller than MP4?: Usually yes. At the same visual quality VP9 typically produces a file 20–40% smaller than H.264, which is why streaming sites use it. The exact saving depends on the footage — high-motion clips compress less than a static talking-head video.
Does WebM support transparency?: Yes, and this is a key reason to convert. WebM with VP9 can store an alpha channel, so a video with a transparent background stays transparent — something the standard MP4/H.264 format cannot do. It is popular for overlays and animated web graphics layered over a page.
What happens to the audio track?: The audio is re-encoded to a royalty-free codec — Vorbis or Opus — that pairs with WebM. The soundtrack stays in sync at its original quality; only the codec and container change, not the video timing.
Will converting reduce the video quality?: The output keeps the original resolution and frame rate. Because it is re-encoded there is a small generational loss, but at the high-quality settings used here it is not visible at normal viewing sizes.
Should I use WebM or stick with MP4?: Use WebM when the video lives on a website and you control the player — to save bandwidth or to keep transparency. Keep MP4 for maximum compatibility: sending a file to someone, uploading to social platforms, or playing on Apple hardware where WebM support is weaker.

About MP4 and WEBM

Key things to know before you convert MP4 to WEBM:

MP4

MP4 with H.264 is the universal video format: phones, TVs, browsers, editors and messengers all play it. When in doubt, send MP4.

WEBM

WebM is Google's open web video container (VP9/AV1 inside): better compression than H.264, royalty-free, native to browsers. Hardware players and Apple devices support it less consistently.

Related conversions

MP4→GIF MP4→MP3 WEBM→MP4 MOV→MP4 AVI→MP4 MKV→MP4 GIF→MP4 WMV→MP4