SnapMedia

Free online converter

AVI to MP4 Converter

Bring old AVI videos — from cameras, DVRs and screen recorders — into MP4, the format every modern device plays.

No upload

Converted on your device

No sign-up

Free, no daily limit

No watermark

Your file, untouched

Batch

Several files at once

How to convert AVI to MP4

  1. Add your AVI files. Drag them onto the box above or click to choose them. You can add several at once.
  2. Check the target is MP4. It is already selected. Adjust the quality under Options if you want.
  3. Click Convert. The conversion runs in your browser — the file is never uploaded to a server.
  4. Download the MP4. When it finishes, click Download on each file.

When you need this

Digitised home videos, old camera clips and legacy recordings you want to watch on a phone or share online.

AVI vs MP4

AVI

A legacy Microsoft container from the 1990s, still produced by old cameras, DVRs and screen recorders. Large files and patchy support on modern devices.

Best for: nothing new — convert it to MP4.

MP4

The universal video format. H.264 video with AAC audio in an MP4 plays on every phone, browser, TV and social network.

Best for: sharing, uploading to YouTube, Instagram or TikTok, and playing anywhere.

Will I lose quality?

If the video inside the AVI already uses a codec MP4 supports — H.264 or HEVC, which is what phones, cameras and OBS produce — it is not re-encoded: it is copied into the new container. That takes seconds and the quality is identical. Only an incompatible codec is re-encoded, to high-quality H.264.

Have a link instead of a file?

Paste it into the YouTube MP4 downloader and skip the conversion.

Related conversions

MOV to MP4WEBM to MP4MKV to MP4MP3 to MP4All conversions →

Frequently Asked Questions

How do I convert AVI to MP4?
Drag the AVI file onto the box above, check the target is MP4 and click Convert. As soon as it finishes a Download button appears. Nothing to install, no account needed.
Is it free to convert AVI to MP4?
Yes, completely: no sign-up, no daily limit and no watermark. Your own browser does the conversion, so it costs us nothing and there is no reason to charge for it.
Are my files uploaded to a server?
No. The converter runs inside your browser: the file is read and converted on your device and never leaves it. That is why it is safe for private or work recordings.
Will I lose quality?
If the video inside the AVI already uses a codec MP4 supports — H.264 or HEVC, which is what phones, cameras and OBS produce — it is not re-encoded: it is copied into the new container. That takes seconds and the quality is identical. Only an incompatible codec is re-encoded, to high-quality H.264.
Is there a file size limit?
Up to 1 GB per file. The limit is not a business one but the browser’s: all the work happens in its memory, and above that size some browsers close the tab. On a phone, stay well below it.
Can I convert several files at once?
Yes. Add as many AVI files as you like and they are converted one after another with a single click. Each one can go to a different format.