WMV to MP4 Converter

Turn a Windows-only WMV into an MP4 that plays on any phone, Mac, browser, or social app. Free, in your browser, with no signup or watermark.

Select WMV file →

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Click or drag and drop to upload files

We support most file types including: MP4, MOV, WEBM, AVI, MP3, WAV, PNG, JPEG, GIF, MKV, PDF, FLAC, TIFF!

EchoWave is used by creators, marketers, educators, and businesses to convert and edit media online.

Updated June 2026

WMV is a Windows Media format that often refuses to open on a Mac, an iPhone, or inside most social apps. Converting it to MP4 fixes that in one step: MP4 is the format phones, browsers, TVs, and upload pages all expect. EchoWave does the conversion free in your browser, with no signup and no watermark.

Free, no sign-upNo account, no trial

Runs in your browserNothing to install

Works on every devicePhone, tablet, laptop

No watermarkClean output, every time

How it works

How to convert WMV to MP4

1
Upload your WMV
Drag your WMV onto the converter or pick it from your device. Nothing to install.
2
Choose MP4 and convert
Select MP4 as the output and start. Free, with no sign-up and no watermark.
3
Download your MP4
Save the finished MP4, or open it in the editor to trim, crop, or resize it first.

Try it

Estimate your MP4

Pick a video bitrate and a length to see the MP4 file size before you convert.

Video bitrate

Length5 min

1 min30 min

Estimated MP4 size183MBSharp 1080p

An estimate. Real size varies with resolution, frame rate, and how much the picture moves.

The formats

WMV vs MP4

WMV

Windows Media Video

Windows Media video, small and Windows-first

Type: Windows Media video
Holds: Windows Media video with WMA audio
Typical size: Small, built for Windows
Plays on: Windows Media Player and VLC

Best for:Older Windows video and slideshows

MP4

MPEG-4 Part 14

The video format that plays everywhere

Type: Video container
Holds: H.264 video plus AAC audio, sometimes subtitles
Typical size: Large, it carries video
Plays on: Phones, browsers, TVs, almost any player

Best for:Watching and sharing video

Will it lose quality?

When the codecs already match MP4, the converter can change the container without re-encoding, so the picture stays identical.
When the video has to be re-encoded for MP4, a high bitrate keeps it visually close to the WMV.
Converting cannot add detail the WMV never had. The output is at best as good as the source.

Use cases

What people use it for

Play anywhereMake a clip your device supports

Video editorsGet footage your software accepts

Web videoUse a format browsers play

CourseworkHand in a standard video file

SharingSend a clip people can open

Troubleshooting

If something looks off

The MP4 will not play

Some players are picky about codecs. Try it in VLC, which opens almost anything, or convert again and let the converter re-encode the video.

The file got larger

A format change can shift the size, and re-encoding at a high bitrate adds overhead. Lower the bitrate or trim the clip for a smaller file.

Audio and video drift out of sync

Re-download the source and convert again. If a long recording drifts, splitting it into shorter pieces usually fixes the sync.

FAQ

WMV to MP4 questions

Why won't my WMV file play on a Mac or iPhone?

WMV is a Windows Media format, so Apple devices have no built-in support for it and QuickTime, Photos, and iMovie usually reject it. Converting to MP4 gives you a file that plays natively on macOS, iOS, and almost everything else, with no extra player needed.

Is the WMV to MP4 converter free?

Yes. EchoWave converts WMV to MP4 with no signup, no trial, no watermark, and no file-count limit on these pages. Upload your video, convert it, and download the MP4 from your browser.

How do I convert WMV to MP4?

Upload your WMV, choose MP4 as the output format, and start the conversion. When it finishes, download the MP4 or open it in the editor to trim, crop, or add captions.

Will converting WMV to MP4 lower the quality?

WMV uses a different codec from MP4, so the video is re-encoded rather than simply rewrapped. Exporting at a high bitrate keeps the result visually close to the source. Converting cannot add detail the original WMV never had.

Can I upload the MP4 to YouTube, Instagram, or TikTok?

Yes, and that is one of the main reasons to convert. Most platforms reject WMV but accept MP4 directly, so the converted file uploads without the format errors WMV tends to trigger.

Does the WMV to MP4 converter work on Mac, Windows, iPhone, and Android?

Yes. The converter runs in any browser, so you can turn WMV into MP4 on macOS, Windows, Chromebook, Linux, iPhone, iPad, and Android with nothing to install.

Can I convert large WMV files or several videos to MP4?

There is no limit on the number of files, so push your WMV clips through one at a time and collect each MP4 as it completes. Since H.264 MP4 packs the picture more tightly than WMV, even a long source usually ends up a manageable size; the upload of a big original is the part that takes the extra time.

Is it safe to convert WMV to MP4 here?

Yes. Swapping a Windows Media file for a universally playable MP4 takes no sign-up and no software download; it all happens in your browser. Read our security page to see how the WMV you send and the MP4 you receive are handled.

Will the MP4 be smaller than my WMV?

Often, yes. MP4 with H.264 is an efficient codec, so a re-encode at a sensible bitrate can shrink an older WMV while keeping it sharp. The exact size depends on the resolution, length, and bitrate you choose.