Convert AVI to MP4 Online
Turn AVI files into MP4 output online. The service is free, requires no account, supports batch queues, and limits server uploads to 100 MB per file. The conversion runs on the server in an isolated request. Keep the original file while you review the converted copy.
Convert .AVI to .MP4
Select a file to begin. Processing details and limits are listed below.
How to convert AVI to MP4
- 1
Upload AVI files
Add one or more AVI files to the queue. The uploader keeps batch items separate.
- 2
Set the MP4 options
Set the available quality or format options, or keep the defaults for a first pass.
- 3
Create the MP4 file
Run the queue and download the MP4 files individually or together as a ZIP.
Audio Video Interleave vs MPEG-4 Part 14 video
| Spec | Audio Video Interleave | MPEG-4 Part 14 video |
|---|---|---|
| MIME type | video/x-msvideo | video/mp4 |
| Format type | video | video |
| Standard | Pending review | ISO/IEC 14496-14 |
| First release | Pending review | 2003 |
| Browser support | Pending review | All current major browsers for common codecs |
| Contents | Standard Windows video container. | Container for video, audio, subtitles, and metadata. Common payloads include H.264, H.265, AV1, AAC, and MP3. |
About Audio Video Interleave
Standard Windows video container.
About MPEG-4 Part 14 video
Broad device support, efficient streaming, flexible codec choices, and good compatibility with social platforms. Compatibility depends on the codecs inside the container, not only the .mp4 extension; advanced subtitles and chapter support vary.
Format referenceWhy convert AVI to MP4?
- MP4 is more widely accepted by browsers, phones, TVs, or sharing services than the source AVI file.
- A standardized output makes it easier to archive, upload, or hand a file to someone with different software.
- Playback compatibility is usually the main reason to change a media container.
- A converted copy separates the delivery format from the original edit or camera file.
Will quality change?
MP4 output uses a standard video codec and may drop subtitle, attachment, or metadata tracks. Test playback on the target device. Keep the source if you may need to adjust the conversion later.
Processing and limits
- Processing
- Server-side
- Engine
- FFmpeg
- Maximum size
- 100 MB per file on the server.
- Batch support
- Yes, multiple files can be queued; completed results can be downloaded as a ZIP.
- Quality controls
- Options can adjust quality, output dimensions, audio bitrate.
The file is processed on the server because the conversion requires a server-side engine or a utility operation.
- Compatibility depends on the codecs inside the container, not only the .mp4 extension; advanced subtitles and chapter support vary.
- Review the converted file in the destination application before deleting the source.
- Batch results should be spot-checked before publication or delivery.
Platform compatibility
MP4 works in all current major browsers for common codecs. Open the result in the app where it will be used, and keep the source AVI for comparison.
When not to convert
- Do not convert when the original AVI must remain the only editable or archival copy.
- Skip the conversion when the destination already accepts AVI and no compatibility problem exists.
- For a one-off preview, a local viewer may be faster than creating a new delivery file.
Frequently asked questions
- How do I convert AVI to MP4 online?
- Upload a AVI file, choose the available MP4 options, run the conversion, and download the result. The tool is free, supports batches, and accepts server uploads up to 100 MB.
- Does Convert AVI to MP4 require an account?
- It is free, requires no account, and adds no watermark. Server uploads are limited to 100 MB per file, and browser-first paths are limited by device memory.
- What happens to quality?
- MP4 output uses a standard video codec and may drop subtitle, attachment, or metadata tracks. Test playback on the target device. Keep the source if you may need to adjust the conversion later.
- Is my AVI file uploaded?
- Yes. This conversion uses a server-side engine, so the file is uploaded over HTTPS, processed in an isolated request, and removed after the result is produced.
- Is batch conversion supported?
- Queue multiple files, run them together, and download the finished results as a ZIP. Each server file is limited to 100 MB, and large batches may take longer.
- What can go wrong?
- Open the downloaded MP4 file in the application or database you plan to use, check the structure against the source, and keep the original until the output is approved.