Convert MP4 ↔ WebM ↔ AVI
Video conversion requires FFmpeg/WebAssembly. This is a UI demo - needs ffmpeg.wasm integration for full functionality.
Click to select video
Mavis Digital's online video format conversion tool. Supports conversion between popular formats: MP4, WebM, AVI, GIF. Simple interface, preview video before converting, display detailed file information. Note: this is a UI demo, requires FFmpeg WebAssembly integration or backend API to fully function. Detailed instructions on how to integrate FFmpeg for developers.
Each platform, device and browser supports different video formats. MP4 (H.264) To is the most popular format, compatible with most devices and platforms. WebM is optimized for the web with high quality and small capacity, natively supported by Chrome and Firefox. AVI To is an old format but still used in some workflows. GIF allows creating short animations to share on social media. Format conversion helps videos of you is compatible with the target platform, optimizes capacity, or meets specific technical requirements.
MP4 (H.264/AVC): The most popular format, compatible with all devices and browsers, good balance between quality and capacity, suitable for most uses. WebM (VP8/VP9): Open format belonging to Google, optimized for the web, 10-30% smaller capacity than MP4 with equivalent quality, natively supported by Chrome, Firefox, Edge, supported by Safari from version 14.1. AVI: Old format of Microsoft, large capacity, low compression, suitable for editing archives. GIF: Animation, limited to 256 colors, large capacity for long videos, suitable for short clips under 10 seconds.
Convert video is a computationally intensive task, FFmpeg - the most powerful media processing library is often needed. On the web, it is possible to use FFmpeg.wasm - a version of WebAssembly that of FFmpeg that runs in the browser. However, FFmpeg.wasm has some limitations: the speed is 5-10 times slower than native FFmpeg, consumes a lot of RAM, some codecs don't supported. For large videos, it is necessary high speed, backend API should be used with FFmpeg native. This tool is currently is demo UI, developers can integrate FFmpeg.wasmorbackend according to the instructions.
To integrate FFmpeg.wasm: 1) Install package: npm install @ffmpeg/ffmpeg @ffmpeg/core. 2) Import andload FFmpeg: const ffmpeg = createFFmpeg({ log: true }); await ffmpeg.load(). 3) Write input file: ffmpeg.FS('writeFile', 'input.mp4', awaitFile(file)). 4) Run command convert: await ffmpeg.run('-i', 'input.mp4', 'output.webm'). 5) Read output file: const data = ffmpeg.FS('readFile', 'output.webm'). 6) Create blobanddownload. Note that you need to configure CORS headers for SharedArrayBuffer if using multi-threaded version.
Upload video to the web: Convert to WebM or MP4 H.264 to ensure compatibility with all browsers. Share on social media: Each platform has different requirements - Instagram likes MP4, Twitter supports MP4 and GIF. Create GIF for chat/email: Extract short videos to send via Slack, Discord, email. Reduce video size: Convert from AVI to MP4 or WebM to significantly reduce size. Old device compatibility: Some TVs Old players only support AVI or MP4 baseline profile.
Choose the right format for your purpose: WebM for web, MP4 for cross-platform, GIF for short clips. With GIFs, keep the video under 10 seconds and resize it down to avoid the file being too large. If you need the highest quality, keep the original formator use a lossless codec. With 4K video, consider downscaling to 1080p if high resolution is not needed. Test video output on target device/platform before publishing.
Video conversion requires FFmpeg library to encode/decode formats. Here is a UI demo showing the interface and usage flow. For full functionality, integration of FFmpeg.wasm (running in the browser) or backend API with FFmpeg native is required. See the 'Integration Guide' section for details.
MP4 uses the H.264 (or H.265) codec, which is an industry standard, compatible with all devices. WebM uses Google's VP8/VP9 codec, which is an open format, optimized for the web with smaller capacities. WebM is well supported by Chrome, Firefox, Edge, and Safari from version 14.1. If maximum compatibility is needed, choose MP4. If you only use it for the web and want a small capacity, choose WebM.
With FFmpeg.wasm in the browser, long and heavy videos will process slowly and consume a lot of RAM. Recommended videos under 100MB and under 10 minutes for a good experience. For larger videos, desktop software such as H and Brake or FFmpeg command line should be used.
Yes, every time a video is re-encoded there is a degree of loss of quality (lossy compression). However, with the right bitrate, the difference is usually negligible to the naked eye. To keep the best quality, avoid converting multiple times and choose a high bitrate. If long-term storage is needed, keep the original file.
GIF has a limit of 256 colors, so it's not suitable for complex videos. To have a beautiful GIF: keep the video short (under 5-10 seconds), resize to a small size (480p or lower), choose a video with little movement and simple colors. For long or complex videos, consider using WebM instead of GIF.
With FFmpeg.wasm, videos are processed entirely in the browser, not uploaded to the server. However, if you use the backend API, the video will be uploaded for processing on the server. Check the privacy policy of each specific tool.
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