Why can't I play WMV on my iPhone or Mac?

WMV uses Microsoft's proprietary VC-1 codec, which Apple devices don't support natively. Converting to MP4 with H.264 encoding makes the video playable on any modern device.

Will converting WMV to MP4 reduce quality?

WMV always requires re-encoding to MP4, which introduces some quality change. At a matching bitrate, the quality is usually visually identical. Use a higher output bitrate if you're concerned about compression.

Are my video files uploaded?

No. All conversion runs in your browser via FFmpeg WebAssembly. Your files never leave your device.

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WMV to MP4 Converter Online Free

Convert WMV (Windows Media Video) files to MP4 for playback on iPhones, Macs, Android devices, and any modern platform. WMV is a legacy Windows format that doesn't play on iOS, most smart TVs, or Mac without additional software. Converting to MP4 fixes this instantly.