MKV to AVI Converter

Turn an MKV into an AVI that older Windows software, media sticks, and legacy players can open. Free, in your browser, with no signup.

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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

Convert an MKV to AVI when an older program or device refuses to open the Matroska container. AVI is a long-standing Microsoft format that almost any Windows machine, media stick, or legacy player will read, so it is a reliable fallback when MKV will not load. The trade-off is that AVI only carries one video and one audio track, so extra audio languages, embedded subtitles, and chapters from the MKV are left behind. EchoWave handles the change in your browser, free and with no signup.

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 MKV to AVI

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

Try it

Estimate your AVI

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

Video bitrate

Length5 min

1 min30 min

Estimated AVI size183MBSharp 1080p

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

The formats

MKV vs AVI

MKV

Matroska Video

An open container that holds almost anything

Type: Open video container
Holds: Almost any codec, plus several audio and subtitle tracks
Typical size: Large, depends on the codec inside
Plays on: VLC and most modern players, less on default phone apps

Best for:Movies with multiple audio tracks and subtitles

AVI

Audio Video Interleave

A legacy Microsoft video container

Type: Legacy video container
Holds: Older codecs like DivX or Xvid with MP3 or PCM audio
Typical size: Large for the quality it gives
Plays on: Windows and VLC, patchy on phones

Best for:Playing older Windows video files

Will it lose quality?

When the codecs already match AVI, the converter can change the container without re-encoding, so the picture stays identical.
When the video has to be re-encoded for AVI, a high bitrate keeps it visually close to the MKV.
Converting cannot add detail the MKV 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 AVI 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

MKV to AVI questions

Why convert MKV to AVI instead of MP4?

Choose AVI when you are feeding an older program or device that predates wide MKV support and expects a classic Windows container, such as legacy editing software, an old media player, or a car head unit. If your target is a modern phone, browser, or smart TV, MKV to MP4 is usually the better fit because MP4 is more universal and smaller.

Will my subtitles and extra audio tracks survive the conversion?

AVI is a single video, single audio container, so it cannot hold the multiple audio languages, embedded subtitle tracks, or chapters that an MKV can carry. The main video and one audio track convert, but the extras are dropped. If you need those, keep the MKV or convert to a format that supports them.

Is the MKV to AVI converter free?

Yes. EchoWave converts MKV to AVI with no signup, no file-count limit, no trial, and no watermark. Upload your video, pick AVI, and download the result from your browser.

How do I convert MKV to AVI?

Upload your MKV, choose AVI as the output format, and start. When it finishes, download the AVI or open it in the editor to trim or resize it first.

Will converting MKV to AVI reduce the quality?

AVI uses older codecs, so the video is re-encoded rather than simply repackaged. A high bitrate keeps the result visually close to the source, but converting cannot add detail the MKV never had. The output is at best as good as the original.

Does the MKV to AVI converter work on Mac, Windows, iPhone, and Android?

Yes. The converter runs in any browser, so it works on macOS, Windows, Chromebook, Linux, iPhone, iPad, and Android with nothing to install. AVI itself is most at home on Windows, but you can create it from any of these devices.

After converting MKV to AVI, what opens the file?

Windows Media Player and VLC open AVI on the desktop, and most older Windows software and many hardware players support it too. On a Mac or phone, VLC is the most reliable way to play an AVI.

Can I convert a large MKV movie?

Yes. There are no file-count limits, and large videos are supported. A long, high-resolution movie simply takes a little longer to upload and convert.

Is it safe to convert MKV to AVI here?

Yes. There is no account to create and nothing to install. See our security page for how EchoWave handles your files.