WMV to WebM Converter

Turn a heavy Windows WMV into a light, open WebM that modern browsers play inline with no plugin. Free, in your browser, with no signup.

Select WMV file →

Rated 4.5 / out of 5 by Video Creators on

Choose Files

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 browsers refuse to play directly, which makes it a poor fit for the web. WebM is the opposite: an open, royalty-free format built for HTML5 video that loads inline in Chrome, Firefox, Edge, and modern Safari. EchoWave re-encodes your WMV to VP8 or VP9 video in your browser, free and with no signup, so you get a smaller WebM that drops straight onto a web page.

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 WebM

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

Try it

Estimate your WebM

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

Video bitrate

Length5 min

1 min30 min

Estimated WebM size183MBSharp 1080p

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

The formats

WMV vs WebM

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

WebM

Open video built for the web

Type: Open web video container
Holds: VP8 or VP9 video with Vorbis or Opus audio
Typical size: Small at good quality
Plays on: Chrome, Firefox, Edge, and Android

Best for:Video embedded on web pages

Will it lose quality?

When the codecs already match WebM, the converter can change the container without re-encoding, so the picture stays identical.
When the video has to be re-encoded for WebM, 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 WebM 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 WebM questions

Is the WMV to WebM converter free?

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

How do I convert WMV to WebM?

Upload your WMV, choose WebM as the output format, and start the conversion. When it finishes, download the WebM or open it in the editor to trim or resize it for the web first.

Why convert WMV to WebM?

Browsers cannot play WMV, but they play WebM natively with no plugin. WebM is open, royalty-free, and built for HTML5 video, and at the same quality it is usually smaller than the source, which means faster page loads. It is the right format for video you embed on a website.

Will the WebM be smaller than the WMV?

Usually, yes. WebM uses the efficient VP8 or VP9 codec, which often produces a smaller file than the original WMV at similar quality. The exact size depends on the resolution, length, and how much the picture moves, and you can pick a lower bitrate for an even lighter file.

Will converting WMV to WebM reduce the quality?

WMV and WebM use different codecs, so the video is re-encoded rather than just rewrapped. A higher WebM bitrate keeps the picture close to the original WMV. Converting cannot add detail the source did not have, so the result is at best as good as the WMV.

Which browsers play the WebM I convert from WMV?

WebM plays inline in Chrome, Firefox, Edge, and Opera, plus Safari 16 and later on desktop and iOS 17.4 and later. That covers the vast majority of visitors, which is why WebM is a common choice for web video.

Should I use WebM or MP4 for my website?

WebM is open and often smaller, while MP4 has the widest reach across older devices and apps. Many sites offer both and let the browser pick. If you want the most universal single file, convert WMV to MP4 instead, or add it alongside the WebM.

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

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

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

Go ahead and convert as many as you need; nothing caps the count, so run your WMV files through one by one and download each WebM for the web. VP9 encoding is thorough, so a large or long source spends more time re-encoding, but the WebM that comes out is typically lighter than the WMV you started with.