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WMV to MP4 Converter Online Free

Convert WMV to MP4 online in your browser, or switch to the desktop app for faster batch jobs and finer control. Fix playback issues on Mac, phones, browsers, editors, and share your videos anywhere with a widely compatible MP4 format.

For more powerful WMV to MP4 conversion needs, UniConverter Desktop gives you much more:

  • Convert WMV to MP4 in batch and save time on large files
  • Enjoy up to 130× faster conversion speed
  • Support for 1,000+ audio/video/image formats
  • An all-in-one toolkit including editing, enhancement, and more
Batch Convert WMV to MP4
Batch Convert WMV to MP4
Batch Convert WMV to MP4

How to Convert WMV to MP4 Step by Step

upload mkv format file
Step 1

Upload your WMV video

Open the online WMV to MP4 converter in your browser and click the upload area to add a WMV file from your computer, or drag and drop it directly. Wait for the upload to finish; larger videos will naturally take a bit longer to transfer.

choose mp4 as output format
Step 2

Choose MP4 as the output format

Once your WMV is uploaded, select MP4 as the target format from the format list. Online tool presets are kept simple, so you do not need to tweak technical parameters, making it easy even if you know nothing about codecs or bitrates.

download converted mp4 video
Step 3

Convert and download your MP4 file

Click the Convert button to start turning WMV into MP4 on the server. When the process completes, download your new MP4 file and play it on Mac, iPhone, Android, browsers, or import it into editing software without the original WMV compatibility issues.

WMV vs MP4: Compatibility, Quality and Use Cases

WMV
MP4
File Extension .wmv .mp4
Full Name Windows Media Video MPEG-4 Part 14
Description WMV is a Microsoft video format designed for Windows Media frameworks, often used in older recordings, downloads and Windows Movie Maker exports, with good compression but limited support on non‑Windows devices and some modern browsers. MP4 is a widely supported container format that usually holds H.264 or H.265 video and AAC audio, offering excellent balance between quality and file size and working smoothly across phones, tablets, computers, TVs and online platforms.
Associated Programs Windows Media Player, VLC media player, Microsoft Movies & TV, MPC-HC VLC media player, QuickTime Player, Windows Media Player, iTunes, most web browsers
Initial Release 1999 2003
Developer Microsoft ISO/IEC Moving Picture Experts Group
Common Use Cases Legacy video archives, Windows desktop recordings, early online streaming, training videos distributed inside Windows-based organizations. Online streaming, social media uploads, mobile playback, video editing workflows, archiving and sharing across platforms and devices.
MIME Type video/x-ms-wmv video/mp4

Fast, Safe WMV to MP4 Conversion Online and on Desktop

Free online WMV to MP4 conversion with no software install

Use the browser-based WMV to MP4 converter to handle single or occasional files without installing anything. Upload a WMV, choose MP4, convert, then download. It is ideal for quick fixes when you just need one video to play or share.

High compatibility MP4 output for phones, Mac and browsers

Convert WMV to MP4 to solve playback errors on Mac, iOS, Android and modern browsers. The tool outputs widely supported MP4 files, making it easier to open, stream, upload to platforms, and share with people who do not use Windows Media Player.

Stable MP4 files ready for editing in popular software

Turn WMV files into editor‑friendly MP4 so they import more reliably into Premiere Pro, DaVinci Resolve and similar apps. Using a standard H.264 MP4 profile reduces codec mismatch issues and timeline glitches compared with keeping everything in WMV.

Desktop batch WMV to MP4 conversion for large libraries

Install the desktop version when you need to convert many WMV files at once. It supports batch import and batch export to MP4, letting you process folders of old recordings or lectures automatically instead of converting each video individually online.

Desktop control over resolution, bitrate and encoding

Use the desktop app to tune export parameters when converting WMV to MP4. Adjust resolution, bitrate, frame rate and codec to balance quality and file size for different purposes, from small web clips to higher quality archives or editing masters.

Cross‑platform support on Windows and Mac desktops

Run the desktop converter on both Windows and macOS to handle WMV collections wherever they are stored. You can batch convert, customize export settings and keep your workflow consistent across different computers without relying only on a browser.

Batch Convert Now
Convert Online
Batch Convert Now
Convert Online
Batch Convert Now
Convert Online

Common Questions About Converting WMV to MP4

To convert WMV to MP4 online free, upload your WMV file to the web converter, select MP4 as the target format, then start the conversion. When it finishes, download the generated MP4, test playback on your device, and keep the original WMV as a backup.
Converting WMV to MP4 usually involves re-encoding, so some quality loss is technically possible, but good settings make it hard to notice. The online tool uses sensible defaults, while the desktop app lets you raise bitrate or resolution to preserve more detail.
You should convert WMV to MP4 if you want videos to play smoothly on Mac, phones, browsers and smart TVs, or upload easily to platforms. MP4 is the most widely supported format today, reducing codec errors, missing plugins and awkward workarounds for viewers.
How long it takes to convert WMV to MP4 depends on video length, file size, your internet speed for uploads and downloads, and your computer’s power if using desktop software. Short clips may finish in seconds, while long HD recordings can take several minutes.
Converting WMV to MP4 is generally legal for files you own or are allowed to use, such as personal recordings or properly licensed content. Avoid converting copyrighted movies or shows without permission, and follow local laws, platform rules and license terms.

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— TG

“I have been using Wondershare UniConverter for many years. It has been one of the best ways to download, screen capture and convert videos. It has been my go to for video download and conversion.”

— Alan Horner

What Users Say About This WMV to MP4 Converter

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Start Your WMV to MP4 Conversion Now

Upload a WMV file to convert it to MP4 online for quick playback fixes, or download the desktop app for faster batch jobs and adjustable quality. Choose the workflow that best fits your current project and device setup.
Batch Process Now Upload WMV File
Batch Process Now Upload WMV File
Batch Process Now Upload WMV File
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