What codecs does the WebM viewer support?

It relies on your browser's built-in decoders. VP8 and VP9 work in all major browsers; AV1 playback depends on hardware support in your device.

Are my WebM files uploaded?

No. Files opened from your device stay on your device and are decoded locally. Only the public sample files are requested from the server.

Can it convert WebM to MP4?

No, this is a viewer only. It plays WebM locally without uploading; use a dedicated converter if you need to change the format.

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Videos

WebM Viewer

Free online WebM viewer. Play .webm videos directly in your browser without uploading — no install, no server processing.

.webm

VP9 Horizontal Video - 1080p

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Tool usage guide

About this file format

WebM (.webm) is an open, royalty-free media container introduced by Google in 2010 and built on the Matroska format. It typically holds VP8, VP9 or AV1 video with Vorbis or Opus audio. Because it is license-free and efficient at low bitrates, WebM is popular for web video, screen recordings and real-time communication.

WebM Viewer

About this file format

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WebM Viewer

Overview

When to use

How it works

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FAQ

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