MP4 to WMV Converter

WMV (Windows Media Video) is still the format some Windows setups expect: Windows Media Player on older PCs, PowerPoint 2007–2010 presentations, kiosk and signage players, and company systems locked down without extra codecs. This converter turns MP4 and other videos into WMV 8 video with WMA 2 sound in an ASF container, the combination those programs play without anything installed. Pick a maximum resolution and quality; it runs entirely in your browser, so your video is never uploaded.

How to use this tool

1. Choose one or more videos (MP4, MOV, MKV, WebM, AVI and others).
2. Pick the maximum resolution: 720p suits presentations; choose 1080p or the original for large screens.
3. Pick the quality; standard is a good balance.
4. Download the .wmv files.

Formula

Video bitrate = base rate for the short side × quality factor (high 1.5, standard 1, small 0.6)

Base rates: 600 kbps up to 240 lines, 1,000 at 360, 1,800 at 480, 3,500 at 720, 6,500 at 1080 and 12,000 above, rounded to 50 kbps. WMV 8 is an older codec, so it needs roughly twice the bitrate of H.264 for a similar picture. Sound is WMA 2 at 160 kbps stereo (96 kbps mono). Rotated phone videos are turned upright and non-square pixels made square, because WMV players ignore those flags.

Example

A 3-minute 1080p MP4 converted at 720p, standard quality: 3,500 kbps video + 160 kbps sound = 3,660 kbps × 180 s ÷ 8 ≈ 82 MB. WMV 8 is quick to encode: about 50 frames per second at 720p in the browser on a recent computer, so 3 minutes at 30 fps take about 2 minutes.