How to Convert MP4 to WebM Online
Convert MP4 to WebM for web. Free, fast, and no account required.
Drop your MP4 file here
or click to browse from your device
Supports MP4 · Max 250 MB
🔒 Converted entirely in your browser — your file never leaves your device.
Converting MP4 to WEBM changes your file from MP4 (MPEG-4 Part 14) to WebM. MP4 files are commonly used for Video sharing and streaming and Social media uploads, while WEBM is a better fit when you need Optimized for web delivery and Open and royalty-free. Convert to WEBM when an application or platform requires it, or when its strengths suit your project better than MP4. Upload your MP4 file above to convert it in seconds — no software to install and no account required.
What Is MP4?
MP4 is the most widely used video container format. It supports video, audio, subtitles, and still images within a single file. MP4 typically uses H.264 or H.265 video codecs and AAC audio, providing a good balance between quality and file size.
- Video sharing and streaming
- Social media uploads
- Video storage and archival
- Web video embedding
MP4 is a container format that can use different codecs. Compatibility depends on the specific codecs used within the file. H.264 with AAC audio offers the broadest device support.
What Is WebM?
WebM is an open multimedia format developed by Google for use on the web. It uses VP8/VP9 video codecs and Vorbis/Opus audio codecs. WebM is designed for efficient web streaming and is supported natively in most browsers.
- Web video embedding
- HTML5 video playback
- Browser-based video applications
- Web streaming
WebM is primarily a web format. For playback on desktop media players or mobile devices outside of browsers, MP4 is generally more compatible.
Why Convert MP4 to WebM?
- 1Optimize for web delivery with the modern WEBM format
- 2Put WebM to work for Web video embedding and HTML5 video playback
- 3Convert MP4 to WEBM right in your browser — nothing to install and no account to create
How to Convert MP4 to WebM
- 1
Upload your MP4 file
Drag and drop your MP4 file into the upload area above, or click to open your file browser.
- 2
Start the conversion
Click the "Convert to WebM" button. The conversion begins immediately and you can track progress.
- 3
Download the result
Once complete, click the download button to save your WebM file to your device.
Privacy & Security
This conversion is processed entirely in your browser using WebAssembly. Your file is never uploaded to our servers — full privacy guaranteed.
Frequently Asked Questions
To convert a MP4 file to WEBM, use the upload area on this page. Drag and drop your MP4 file or click to browse your files. Once uploaded, click the "Convert to WEBM" button. The conversion will be processed and the resulting WEBM file will be available for download.
Yes. This conversion tool is completely free to use. There are no premium tiers, no watermarks applied to your output, and no limit on the number of conversions you can perform. The service is supported by advertising.
MP4 (MPEG-4 Part 14) MP4 is the most widely used video container format. WebM WebM is an open multimedia format developed by Google for use on the web. Converting between these formats allows you to take advantage of the strengths of each format depending on your specific needs.
Converting MP4 to WEBM makes sense when you need what WebM is good at: Optimized for web delivery, Open and royalty-free, Supported in all modern browsers. It is commonly used for Web video embedding, HTML5 video playback, Browser-based video applications. WebM is primarily a web format. For playback on desktop media players or mobile devices outside of browsers, MP4 is generally more compatible.
The output quality depends on the codecs and settings involved. When converting between lossy formats, some quality adjustment is expected. Video and audio conversions in FlipMyFiles are processed in your browser using standard encoding settings designed to maintain good quality.
Yes. Video and audio conversions are processed entirely in your browser using WebAssembly technology. Your file is never uploaded to our servers. The conversion happens locally on your device, providing full privacy.
The maximum file size is 250 MB per file. This limit applies to all format types. For video and audio files, conversion speed depends on your device's processing power since the conversion runs in your browser.