What is MP4 and why is it the best format for sharing videos?

MP4 (MPEG-4 Part 14) is the most universally compatible video format. It plays natively in every web browser, on every smartphone (iPhone and Android), on smart TVs, game consoles, and all computers. When you share an MP4 file, you can be confident the recipient can watch it without installing special software.

Video to MP4 Converter - Make Videos Play Everywhere

Convert any video to MP4 format that plays on all devices and browsers. Works with MKV, AVI, MOV, WebM, and more. Free, private, browser-based.

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MKV, AVI, MOV, WebM, WMV, FLV, and more

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All processing happens in your browser using FFmpeg WebAssembly. Your videos never leave your device—completely private and secure.

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Frequently Asked Questions

This tool converts virtually any video format to MP4, including: MKV (Matroska), AVI (Windows videos), MOV (iPhone/Mac videos), WebM (web videos), WMV (Windows Media), FLV (Flash videos), 3GP (old phone videos), TS (broadcast recordings), M4V (iTunes videos), and many more.

Browsers and phones have limited format support for compatibility and security reasons. MKV and AVI are container formats that can hold various codecs, some of which browsers don't support. Converting to MP4 with H.264 codec ensures universal playback because H.264 is hardware-accelerated on virtually every device.

For most uses, 'High Quality' provides excellent results with reasonable file sizes. Choose 'Best Quality' when visual perfection matters (professional work, archiving). Choose 'Smaller File' for email attachments, messaging apps, or when storage space is limited. 'Smallest File' is best for quick previews or very large source files.

Some quality loss is unavoidable when re-encoding video, but it's typically imperceptible at 'High Quality' or 'Best Quality' settings. The H.264 codec is highly efficient, so even at lower quality settings, the output looks good. For minimal quality loss, always start from the highest quality source file you have.

To reduce file size: 1) Choose 'Smaller File' or 'Smallest File' quality, 2) Select a lower resolution like 720p or 480p instead of original, 3) Use a lower frame rate (24fps instead of 30fps). These changes can reduce file size by 50-80% while keeping the video watchable.

Yes! iPhone records video in MOV format with H.264 or HEVC codec. This tool converts MOV to standard MP4, making your iPhone videos compatible with Windows PCs, Android devices, and websites that don't support MOV.

Conversion is always slower than the video's duration—a 1-minute video might take 3-10 minutes to convert. Speed depends entirely on your device: fast desktop computers convert quickly, while phones and older laptops are slower. Higher quality settings also increase processing time. For large files or frequent conversions, consider desktop software like HandBrake (free).

No. All processing happens entirely in your browser using FFmpeg WebAssembly. Your video files never leave your device, making this tool completely private and secure. You can even use it offline after the page loads.

Yes, but browser-based conversion has memory limits. For 4K videos or files over 500MB, processing may be slow or fail on devices with limited RAM. For large files, we recommend using the 720p or 1080p output resolution to reduce memory usage, or using desktop software for better performance.

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