WMV to MP4 Converter Online Free

Convert Windows Media Video files to compatible MP4 in your browser. Free online WMV conversion with no signup, no watermark, and support for large files up to 1 GB.

Or drop files here. Max file size 1GB.

Choose a file before converting.

Input format

WMV

WMV is a Windows Media Video format often found in older Windows recordings, archived clips, email attachments, and legacy camera or editing workflows.

Output format

MP4

MP4 is the safest video format for phones, browsers, smart TVs, messaging apps, social uploads, and modern editing software.

How to convert WMV to MP4 online

Use this WMV to MP4 converter when an older Windows Media Video file will not open, upload, play, or edit smoothly in the app you need.

  1. 1 Upload your WMV video file. Large WMV files up to 1 GB are supported.
  2. 2 Select MP4 as the output format and adjust codec, bitrate, resolution, or quality only if needed.
  3. 3 Start the WMV to MP4 conversion, then download the finished MP4 video.

The MP4 output is designed for broad compatibility across iPhone, Android, Windows, macOS, browsers, smart TVs, social apps, and common video editors.

WMV to MP4 FAQ

How do I convert WMV to MP4 online?

Upload your WMV file, choose MP4 as the output format, start the conversion, then download the finished MP4 video from your browser.

Is this WMV to MP4 converter free?

Yes. Convertr lets you convert WMV to MP4 online for free with no registration, no software install, and no watermark.

Can I convert large WMV files to MP4?

Yes. You can upload WMV videos up to 1 GB per file, which helps with long recordings, archived Windows videos, and larger legacy media files.

Why convert WMV to MP4?

WMV is less convenient outside older Windows workflows. MP4 is accepted by more phones, browsers, TVs, messaging apps, social platforms, and video editors.

Are uploaded WMV files private?

Files are processed securely for conversion and automatically deleted afterward. You do not need to create an account.

Related MP4 conversion tools

Use these pages when another video container needs a compatible MP4 output.

Video Converter MP4 Converter ASF to MP4 MOV to MP4 AVI to MP4 for DivX/Xvid playback WEBM to MP4 MKV to MP4 FLV to MP4 M4V to MP4

What happens when WMV becomes MP4

Source format

WMV is a Microsoft media format with less universal support outside Windows-oriented software.

Target format

MP4 is a widely supported media container, commonly carrying H.264 or H.265 video and AAC audio.

What changes

The WMV container is read and the selected video and audio streams are written into a MP4 container.

Codecs may be transcoded even when the visible resolution and duration stay the same.

What is preserved
Duration, frame order, and visible dimensions are preserved unless you select trimming, frame-rate, or resolution changes.
What may be lost
Extra subtitle, attachment, chapter, or alternate audio tracks may be omitted when the target container or selected settings do not support them.
Codec and quality implications
Container names do not guarantee a codec. Quality and compatibility depend on the selected video codec, audio codec, bitrate, frame rate, and resolution.
Realistic limitations
A valid WMV extension does not guarantee that every codec inside the container is decodable. Corrupt, encrypted, or unusual streams can fail.

Conversion steps

  1. Upload a WMV file no larger than 1 GB.
  2. Confirm that MP4 is selected as the target.
  3. Open settings only if you need to change codec, quality, bitrate, frame rate, resolution, or audio behavior.
  4. Start the conversion. A healthy compatible worker begins processing immediately.
  5. Download the MP4 file and check the result before deleting your source.

Troubleshooting

The WMV file is rejected or will not open.
Confirm that the file is not empty, password-protected, or corrupt and that its real format matches the extension.
The MP4 file is larger than expected.
Choose a more efficient codec or lower quality setting when available. Lossless and uncompressed targets are often larger by design.
The result has no sound or will not play.
Try a broadly supported target codec and verify that the source contains a decodable audio stream.

Privacy and file retention

Uploads and converted files are processed automatically and irreversibly deleted within 24 hours. You can delete them sooner with the delete control. Convertr does not read, mine, sell, or manually review file contents.

Read the privacy policy

Useful alternatives

WMV to AAC Use this when AAC better matches the app, codec, or editing workflow you need. WMV to AIFF Use this when AIFF better matches the app, codec, or editing workflow you need. MP4 to WMV Use the reverse conversion when you need to return to the original format family.