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convertexa

AVI → MP4

AVI to MP4 converter

convertexa converts AVI files to MP4 locally in your browser using a dedicated ffmpeg engine. Nothing is uploaded: the file is read, converted and handed straight back to you as a download.

  • Free, no sign-up
  • Nothing is uploaded
  • Works offline
Quality
Re-encoded
Runs
In your browser
Max input
300 MB
Status
stable

Drop a file to convert

Everything happens on your device — nothing is uploaded.

or paste with Ctrl+V

How to convert AVI to MP4

  1. 1 Drop your AVI file here.
  2. 2 Choose MP4 as the output format and adjust the options.
  3. 3 Convert and download the result.

About AVI and MP4

AVI is an old container that often holds DivX or Xvid video, which is transcoded to H.264.

MP4 with H.264 video is the safest format for browsers and phones.

AVI files are read by the convertexa engine that ships with this page, so the conversion is identical whether you use this tool or the general converter. The output is produced with the same codec settings for every visitor, which means the same input always produces the same result.

Limitations

  • Re-encoding a lossy source cannot restore the quality that was lost when it was first encoded.

Frequently asked questions

How do I convert a AVI file to MP4?

Add your AVI file to the box above. convertexa detects the format from the file content, applies the AVI to MP4 conversion and gives you the result to download. The whole operation runs inside your browser.

Are my AVI files uploaded anywhere?

No. The conversion runs in a sandboxed worker on your own device. Your file never leaves the browser, and nothing is stored on a server.

Is the AVI to MP4 conversion lossless?

No. MP4 is a re-encoded format, so some data is discarded to reach the target format. AVI is an old container that often holds DivX or Xvid video, which is transcoded to H.264.

Is there a size limit?

For reliable results keep the input under 300 MB. Very large files run out of memory in the browser rather than failing quietly.

Which browsers are supported?

Any current version of Chrome, Edge, Firefox or Safari on a desktop. The conversion engines need WebAssembly and Web Workers, both of which are standard since 2018.