Audio & video

Convert WMV to MP4 in your browser

Change a WMV video into an MP4 file on your device. Support depends on the audio and video codecs inside the WMV file, and large videos require enough available browser memory.

No server upload No signup Up to 100 MB per file

Drag files here

This tool processes one file at a time.

WMV · Up to 100 MB per file

Local browser processing — Source files are not sent to our server for conversion.

How to convert WMV to MP4

Create a more widely usable MP4 copy without sending the source video to a conversion server.

Choose one WMV file and review its size and memory warning.
Start the conversion and keep this tab open while the local media engine works.
Wait for processing to finish; long or high-resolution videos can take several minutes.
Download the MP4 and check its picture, sound and duration before deleting the original.

WMV and MP4 explained

WMV and MP4 are containers that can hold different combinations of video and audio codecs.

WMV video: WMV
MP4 video: MP4

MP4 is accepted by more current browsers, phones and publishing services than WMV.
A valid .wmv extension does not guarantee conversion because some older or protected codec variants are unsupported.

When an MP4 copy helps

Use MP4 when a current app or website cannot open the original WMV file.

Preparing an older Windows video for a phone or modern browser.
Creating a compatible copy for a presentation or content-management system.
Replacing a WMV download with a format that is easier to preview and share.

Conversion time, quality and size

Video transcoding can reduce quality and may produce a result that is larger or smaller than the source.

Keep the source until you have watched the entire MP4 and confirmed that audio stays synchronized.
Desktop browsers generally have more memory for long, high-resolution or high-bitrate videos than mobile browsers.

WMV conversion stays on this device

The source video is read by the local browser conversion engine and is not uploaded to our server.

The browser may download documented same-origin conversion-engine assets when you first use a media tool; those assets do not contain your file.
Source and result data remain in temporary tab memory until you clear the job, navigate away or close the tab; downloading saves a separate copy.

FAQ

Frequently asked questions

Can every WMV file be converted?

No. WMV is a container, and some codec variants, encrypted files or damaged files cannot be decoded by the browser conversion engine.

Why does WMV to MP4 take a long time?

The device has to decode and encode the video locally. Duration, resolution, bitrate and available processor speed all affect the time.

Will the MP4 look exactly the same?

Not always. Transcoding can change visual or audio quality, so review important results before relying on them.