🎬 Video Converters
Convert video files between formats in your browser. MP4, WebM, MOV, AVI and more. No uploads required.
All conversions happen directly in your browser using WebAssembly. Your files are never uploaded to any server. First-time load requires downloading ~25 MB (cached automatically for future use).
Video format conversion is required when sharing videos across different platforms, editing in specific software, or optimizing for web delivery. MP4 (using the H.264 codec) is the most universally compatible video format — it plays on virtually every device, browser, and operating system. WebM is the preferred format for web video in HTML5, offering smaller file sizes and better browser performance. MOV is Apple's QuickTime format, common on iPhones and Macs but less compatible elsewhere. AVI is an older Windows format that is large and widely compatible.
All video conversion on this page is powered by FFmpeg compiled to WebAssembly — the same professional-grade encoder used by major streaming platforms, video editors, and broadcasting software, running entirely inside your browser tab. Your video files are never uploaded to any server. Processing time depends on the size of your video and your device's processing speed; large files may take several minutes.
Video converters are used by content creators who shoot on iPhones (which produce MOV files) and need MP4 for editing or sharing, developers who need WebM for HTML5 video elements, social media managers converting between formats required by different platforms, and anyone who has a video file that simply will not play on their device.
A note on file size: video compression is much more complex than audio or image compression. The same visual quality can be achieved at very different file sizes depending on the codec settings. When converting from a high-bitrate source, the output size largely depends on the bitrate settings used. If your converted video is larger than expected, this is often because the source was already compressed and re-encoding it at a higher bitrate is unnecessary — consider using a lower bitrate setting or a tool like Handbrake for fine-grained bitrate control.
- →Converting iPhone MOV files to MP4 for sharing on Windows or Android
- →Converting MP4 to WebM for use in HTML5 video elements on websites
- →Converting AVI to MP4 for smaller file size and better compatibility
- →Converting MP4 clips to GIF for use in presentations or messaging
- →Adding or replacing the audio track in a video file
MP4 to WebM Converter
Convert MP4 video files to WebM format online. WebM is optimized for the web.
WebM to MP4 Converter
Convert WebM video files to MP4 format online for universal device compatibility.
MOV to MP4 Converter
Convert Apple QuickTime MOV files to MP4 format online. Works on any device.
AVI to MP4 Converter
Convert AVI video files to MP4 format online. MP4 is smaller and more compatible.
MP4 to GIF Converter
Convert MP4 video clips to animated GIF online. Perfect for social media and messaging.
Merge Video and Audio
Add or replace audio in a video file online. Merge any video with any audio track. No upload needed.