Convert MP4 to WEBM
MP4 to WEBM converter that runs entirely in your browser. 100% free, no signup, no upload — your files never leave your device. One-click batch conversion.
WebM packages VP9/AV1 video with Opus or Vorbis audio in a royalty-free container built for the web — often 20–30% smaller than H.264 MP4 at similar quality. Converting MP4 to WebM suits HTML5 video backgrounds and open-source projects; encoding takes longer than MP4, and Safari support is relatively recent.
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All file types supported
About formats
MP4
MP4 (MPEG-4 Part 14) is a digital multimedia container format standardized by the Moving Picture Experts Group (MPEG). It stores video, audio, subtitles, and still images in a single file and is the most widely used format for streaming and sharing video across the web, mobile devices, and living-room hardware. MP4 offers an excellent balance between compression efficiency and quality, typically using the H.264 or H.265 (HEVC) video codec together with AAC audio. Its near-universal support makes it the default choice for social media platforms, browsers, phones, and modern TVs.
- Developer
- ISO/IEC (MPEG)
- Initial release
- 2001
- Compression
- Lossy
- Color depth
- up to 12-bit HDR
- Transparency
- No
- Animation
- Yes
Best for
- Sharing videos on social media
- Streaming video over the web
- Playback on phones and tablets
- Storing H.264 or HEVC video
- Distributing downloadable video clips
Pros
- +Near-universal support across devices and browsers
- +Excellent compression-to-quality ratio
- +Supports subtitles, chapters, and metadata
- +Hardware-accelerated decoding on most devices
Cons
- −Patent-encumbered H.264/HEVC codecs
- −Not ideal for lossless archival
- −Editing streams can require re-muxing
WEBM
WEBM is an open, royalty-free multimedia container designed for the web, sponsored by Google. It is based on the Matroska profile and pairs the VP8/VP9 or AV1 video codecs with the Opus or Vorbis audio codecs. WEBM is built for HTML5 video playback and is supported natively by Chrome, Firefox, Edge and most modern browsers.
- Developer
- Initial release
- 2010
- Compression
- Lossy
- Color depth
- up to 12-bit HDR
- Transparency
- No
- Animation
- Yes
Best for
- Embedding video in HTML5 pages
- Web-native video streaming
- Royalty-free video delivery
- Browser-based video playback
- Open-source video projects
Pros
- +Royalty-free and open format
- +Native HTML5 playback in modern browsers
- +Pairs VP8/VP9/AV1 with Opus/Vorbis
- +Efficient compression for web delivery
Cons
- −Limited support in Safari historically
- −Fewer hardware decoders than H.264
- −Less common in professional editing tools
How to convert MP4 to WEBM
- 1
Select MP4 files from your computer, Google Drive, Dropbox, a URL, or by dragging them onto the page.
- 2
Choose webm — or any other format you need as a result (more than 200 formats supported).
- 3
Let the file convert, then download your webm file right away.
MP4 vs WEBM
| Property | MP4 | WEBM |
|---|---|---|
| Compression | Lossy | Lossy |
| Color depth | up to 12-bit HDR | up to 12-bit HDR |
| Multi-track | Yes | Yes |
| DRM support | Yes | No |
| Open format | No | Yes |
When to use MP4 vs WEBM
MP4
- Sharing videos on social media
- Streaming video over the web
- Playback on phones and tablets
- Storing H.264 or HEVC video
- Distributing downloadable video clips
WEBM
- Embedding video in HTML5 pages
- Web-native video streaming
- Royalty-free video delivery
- Browser-based video playback
- Open-source video projects
Use cases for MP4 → WEBM
- Sharing videos on social media
- Streaming video over the web
- Playback on phones and tablets
- Storing H.264 or HEVC video
- Distributing downloadable video clips
- Embedding video in HTML5 pages
- Web-native video streaming
- Royalty-free video delivery
- Browser-based video playback
- Open-source video projects
Frequently Asked Questions
Is converting MP4 to WEBM free?
Which devices and platforms can I use to convert MP4 to WEBM?
Are my MP4 files uploaded to a server?
Can I convert multiple MP4 files at once?
What is the maximum file size?
Will converting MP4 to WEBM reduce the quality?
Does WEBM support transparency?
How will the file size change after converting MP4 to WEBM?
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Your files never leave your device. All processing is completed locally for maximum privacy.
Batch Conversion
Convert multiple files simultaneously to save time. Fast and efficient multi-file queue.
Runs in Browser
Utilizes advanced client-side WebAssembly technology to process files directly inside your tab.
200+ Formats
Supports a wide variety of formats including images, documents, audio, video, and more.
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