MP4 to AVI Converter

Turn an MP4 into an AVI that older Windows players and editors accept. Free, in your browser, with no signup and no watermark.

Select MP4 file →

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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

AVI is the older Microsoft container that some legacy Windows players, editing tools, and devices still expect. Converting your MP4 to AVI rewraps the video so those programs can open it, free and right in your browser with no signup. Expect a larger file than the MP4, since AVI uses less efficient compression for the same picture.

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 MP4 to AVI

1
Upload your MP4
Drag your MP4 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

MP4 vs AVI

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

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 MP4.
Converting cannot add detail the MP4 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

MP4 to AVI questions

Is the MP4 to AVI converter free?

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

How do I convert MP4 to AVI?

Upload your MP4, choose AVI as the output, and start. When it finishes, download the AVI or open it in the editor to trim or crop the clip first.

Why would I convert MP4 to AVI?

AVI has deep roots in Windows, so older media players, classic editing software, some camcorders, and certain DVD or car systems handle it more reliably than MP4. If a program will not open your MP4, an AVI is often the format it expects.

Will the AVI be larger than the MP4?

Usually yes. AVI typically pairs with less efficient compression than MP4's H.264, so the same footage can come out two to three times bigger. That is the trade-off for compatibility with older tools.

Will converting MP4 to AVI reduce quality?

The video is re-encoded for the AVI container, so picking a high bitrate keeps it visually close to the MP4. Converting cannot add detail the source never had, so the AVI is at best as good as the original.

Will the AVI play on my old editor or DVD player?

AVI is the format those tools were built around, so it is your best bet. If a specific player still refuses it, try the file in VLC, which opens almost anything, to confirm the conversion worked.

Can I convert MP4 to AVI on Mac, Windows, iPhone, and Android?

Yes. The converter runs in any browser, so it works on Windows, macOS, Chromebook, Linux, iPhone, iPad, and Android with nothing to install.

Can I convert large videos?

Yes. There are no file-count limits, and large videos are supported. They simply take a little longer to upload and convert, and AVI output tends to be sizeable.