Sign up free
1 free run a day

AVI to MP4 Converter

Convert old AVI videos to modern MP4 (H.264 + AAC) that plays everywhere. Private, in-browser.

Free once a day, no account needed. One file up to 25 MB. Unlimited with Image & Media or All Tools.See plans
Your files never leave your device

How to convert AVI to MP4

  1. 1

    Choose your AVI files

    Click the upload area or drag files onto it. Nothing is uploaded — files are opened locally.

  2. 2

    Adjust the settings

    Pick quality, then press the convert button.

  3. 3

    Download the result

    Save each file individually or everything at once as a ZIP.

AVI videos from older cameras, dashcams and legacy software are large and don’t play on phones or websites. Convert them to MP4 for smaller files and universal playback.

Read the full guide with screenshots

What is AVI?

AVI is an old Microsoft video format still produced by some cameras, dashcams and legacy software. Files are large and modern devices and websites often can’t play them.

What is MP4?

MP4 is the most widely supported video format, used by phones, cameras, YouTube and every social platform.

Is it private?

Yes. Unlike upload-based converters, ZapMorph processes files inside your browser tab, so the file stays on your device. It is never transmitted, stored or logged — close the tab and it’s gone.

Frequently asked questions

Is the avi to mp4 converter free?

Yes, once a day. Convert one file up to 25 MB a day without an account. A free account gets one run a day on any Pro tool with files up to 50 MB; Pro and Lifetime plans are unlimited.

Are my files uploaded to a server?

No. The conversion runs entirely in your browser, so your files never leave your device. We only count how many files you convert — never their names or contents.

What is the maximum file size?

Up to 25 MB per file without an account, 50 MB with a free account, and 1 GB on Pro. Very large files also depend on your device’s memory.

Can I convert multiple AVI files at once?

Yes. Select several AVI files at once — up to 5 on the free plan or 50 on Pro — and download all results in a single ZIP.

Does it work on Mac, Windows, iPhone and Android?

Yes. It works in any modern browser — Chrome, Edge, Firefox and Safari — on desktop and mobile, with nothing to install.

Related converters

Pro

MOV to MP4

MOVMP4

Convert iPhone and QuickTime MOV videos to MP4. Lossless fast mode when possible. Private and secure.

Pro

WebM to MP4

WebMMP4

Convert WebM screen recordings and browser videos to widely compatible MP4 (H.264 + AAC).

Pro

MKV to MP4

MKVMP4

Convert MKV videos to MP4 for iPhone, editors and the web. Lossless fast mode when possible. Private.

Pro

GIF to MP4

GIFMP4

Convert animated GIFs to MP4 video — often 90% smaller. Ready for Instagram, X and TikTok.

Pro

Video

VideoMP4

Convert any video — MP4, MOV, MKV, AVI, WebM, WMV, FLV — to MP4, WebM, MOV, MKV, GIF or MP3. Private.

Pro

MP4 to MP3

MP4MP3

Extract MP3 audio from MP4 videos at up to 320 kbps. Private — videos are processed on your device.