WMV → MP4
Re-encodes WMV from Windows recordings as H.264 + AAC MP4 with faststart, fixing playback on macOS, iPhone and TVs.
Drag files here or click to upload (multiple files supported)
Ctrl+V to paste from clipboard
How to convert WMV to MP4
- 1Upload your WMV file by dragging, clicking, or pasting.
- 2Adjust quality settings if needed.
- 3Click 'Convert Now' and wait for the conversion to complete.
- 4Download your converted MP4 file.
About WMV to MP4 conversion
WMV was released by Microsoft in 1999, encapsulated in ASF containers, and belongs to the Windows Media Player ecosystem. It was mostly used for early corporate internal training and digital rights distribution. MP4 is a cross-platform general-purpose container that supports all mainstream devices and browsers. Conversion solves the insufficient compatibility of this older format.
The conversion is based on FFmpeg, uses the CRF constant quality mode to control output video quality, and preserves the original audio track, frame rate and resolution. The resolution of the original file will not be increased proactively. The output MP4 supports faststart to move the moov atom to the file header, which meets the requirement of progressive playback during download.
It is suitable for converting old corporate internal training WMV videos for cross-device playback and online sharing via browsers. The output MP4 can be played directly on Windows 7 and later, all versions of macOS, and all mainstream Android and iOS devices.
WMV vs MP4: technical comparison
| Feature | WMV | MP4 |
|---|---|---|
| Released | 1999 | 2001 |
| Developer | Microsoft | MPEG |
FAQ about WMV → MP4
Does the quality change after conversion?
Output video quality is controlled by the CRF parameter, whose range conforms to general standards. The tool does not forcibly reduce resolution or frame rate, and you can adjust the output quality level according to your requirements.
Will the original WMV audio track be preserved?
The conversion process preserves the original audio track encapsulated in the WMV file, and re-encapsulates it into the MP4 container. No audio tracks are proactively deleted, and no extra audio track processing operations are performed.
What is the maximum single file size limit?
This tool processes only one file per conversion, with a maximum single file size of 50MB. Files exceeding this limit will be rejected by the system.
Is file privacy and security guaranteed?
Files are uploaded to the server via HTTPS for conversion. After conversion completes, the server immediately deletes both the source file and the output file, and does not store any files.