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WebM Converter – Transform Web Video Files

Convert WebM videos to any format or create WebM for web

Step 1: Upload your files

You can also Drag and drop files.

Step 2: Choose format

Step 3: Convert files

Read Terms of use before using

Step 1: Upload your files

You can also Drag and drop files.

Step 2: Choose format

Step 3: Convert files

Read Terms of use before using

500+ Formats

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Cloud Processing

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What is WebM?

WebM is an open-source video format developed by Google specifically for web use. It uses VP8, VP9, or AV1 video codecs with Vorbis or Opus audio, all royalty-free alternatives to H.264 and AAC.

Introduced in 2010, WebM was designed as a free alternative for HTML5 video. It's natively supported by Chrome, Firefox, Edge, and Opera browsers without requiring any plugins.

WebM offers efficient compression and excellent quality for web streaming, though MP4 remains more universally compatible across all devices.

Why Convert WebM Files?

WebM has limitations outside web browsers:

Mobile apps – Many apps prefer MP4 over WebM
Apple devices – Safari and iOS have limited WebM support
Video editing – Some editors don't handle WebM well
TV playback – Smart TVs often don't support WebM
Social media – Platforms work better with MP4
Creating WebM – Convert TO WebM for web-optimized video

Convert WebM to Other Formats

Transform WebM for universal compatibility:

WebM to MP4

The most common conversion. MP4 works everywhere—all devices, all platforms, all apps—while WebM is limited to browsers.

WebM to AVI

Convert for Windows-based video editing and legacy media players.

WebM to MOV

Transform for Apple ecosystem compatibility and professional editing.

WebM to MKV

Convert to MKV for archival. WebM and MKV are related formats using similar container technology.

WebM to WMV

Convert for Windows-specific applications.

WebM to MP3

Extract audio from WebM videos as MP3 files.

Convert Other Formats to WebM

Create WebM for web-optimized video:

MP4 to WebM

Convert for royalty-free web embedding. WebM is preferred by some sites for its open-source nature.

AVI to WebM

Modernize legacy video for web use with efficient VP9 compression.

MOV to WebM

Convert Apple videos to open-source web format.

MKV to WebM

Transform between these related open-source formats.

WebM Technical Specifications

Full name: Web Media
Developer: Google (based on Matroska)
First released: May 2010
File extension: .webm
MIME type: video/webm
Video codecs: VP8, VP9, AV1
Audio codecs: Vorbis, Opus
Container: Based on Matroska (MKV)
License: Royalty-free, open source

WebM Compatibility

Platforms That Support WebM

Chrome (full support)
Firefox (full support)
Edge (full support)
Opera (full support)
VLC Media Player
YouTube (accepts and uses WebM)

Platforms With Limited WebM Support

Safari (VP9 only, limited)
iPhones and iPads (very limited)
Many smart TVs
Some Android apps
Many video editing programs

How to Convert WebM Files

Upload your WebM file – Drag and drop your web video or click to browse.
Choose your output format – Select MP4 for universal compatibility, or other formats as needed.
Download converted file – Get your video ready for any device or platform.

Expert Tips for WEBM

Pro Tip

WebM with VP9 codec offers excellent compression, often matching H.265 quality. For web use where browsers support it, WebM can deliver better quality than MP4 at the same file size.

Common Mistake

Assuming WebM works everywhere because it works in Chrome. Safari, iOS, and many apps have limited or no WebM support. Always provide MP4 fallback for critical video content.

Best For

WebM is ideal for web embedding, YouTube uploads, and scenarios requiring royalty-free video. It's the preferred format for open-source web projects.

Not Recommended

Avoid WebM as your only video format for general distribution. Always convert to MP4 for sharing, Apple devices, and non-browser playback.

About WEBM

WEBM Format

file extension

.webm

file category

Video

stands for

Web Media file

developer

Google(Initially developed by On2, Xiph and Matroska)

links

en.m.wikipedia.org

overview

WEBM is a multimedia container used for both audio and video formats. It is open-source and royalty-free software due to this, it can be implemented and changed for improvement by any developer. It uses different codecs to compress files. For instance, for video streams compression it uses VP8 or VP9 video codecs and for audio streams, it uses Vorbis or Opus audio codecs. It provides videos of the highest quality and that too with real-time delivery. It provides users with the playback option on any device which is due to the low computational footprint. It is licensed under BSD(A family of acceptable free software licenses). Besides this, it has another project named as Webp for images.

technical description

Its structure is based on the Matroska container. That is why it can support both multiplexing and de-multiplexing. It uses core technologies like HTML, HTTP and TCP/IP which can be easily implemented and this is the main reason for its success. VP8 and VP9 are highly efficient to provide video of the highest quality. It is cost-effective due to its greater efficiency for bandwidths. It is a substitute for H.264 and MPEG4 which are patented software and have copyright. Videos of this format allow playback but it is possible only in Android version 2.3 that is Gingerbread and above. When ‘Rockchip’ came into the market in 2001 it made possible the implementation of full hardware of 1080p. Also, LiVES video editor version 1.4.9 allows coding and deflating of videos in real-time.

Frequently asked questions

WebM is an open-source video format designed for the web. Developed by Google, it uses VP8/VP9/AV1 video codecs and is royalty-free. WebM plays natively in most web browsers.

Upload your WebM file to ChangeMyFile, select MP4 as output, and download. The conversion provides universal device compatibility while maintaining video quality.

WebM uses open-source VP8/VP9 codecs; MP4 uses H.264. WebM is royalty-free but has limited device support. MP4 has licensing fees but works everywhere. For most users, MP4 is more practical.

iPhones have very limited WebM support. Convert to MP4 or MOV for reliable iPhone playback. iOS Safari only partially supports VP9 WebM.

Minimal quality loss occurs with proper settings. Both formats offer excellent compression. Quality depends on bitrate settings during conversion.

YouTube uses WebM (VP9) because it's royalty-free and offers excellent compression. This saves YouTube significant licensing costs while delivering good quality to viewers.

Neither is objectively better. WebM is royalty-free and web-optimized. MP4 has universal device support. For web embedding, either works. For device playback, MP4 is safer.

Most social media platforms accept WebM but prefer MP4. Converting to MP4 ensures faster processing and better compatibility across all platforms.

VP9 is the video codec used in most modern WebM files. Developed by Google, it offers compression efficiency similar to H.265/HEVC but is completely royalty-free.

Yes, ChangeMyFile supports batch conversion. Upload multiple WebM files and convert them all to MP4 or other formats simultaneously.