MP4 to AVI Converter
Upload an MP4 file and convert it to AVI format directly in your browser — nothing is uploaded to any server.
Select MP4 File
Choose an MP4 file and click Convert to get started.
Initializing FFmpeg…
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Your file is being processed locally. This may take a minute for large videos.
An error occurred.
Please try a different file or refresh the page and try again.
All processing runs locally in your browser via FFmpeg.wasm. No file is ever uploaded. FFmpeg (~30 MB) is fetched once from a CDN and cached.
Summary
Upload an MP4 file and convert it to AVI format directly in your browser — nothing is uploaded to any server.
How it works
- Click "Choose MP4 File" and select any .mp4 video from your device.
- FFmpeg.wasm loads in your browser (one-time download, ~30 MB).
- Click "Convert to AVI" to start transcoding with MPEG-4/MP3 codecs.
- A progress bar shows the conversion status in real time.
- When done, click "Download AVI" to save the converted file.
Use cases
- Prepare videos for older software or hardware that requires AVI format.
- Convert clips for legacy video editing suites.
- Share recordings with colleagues who need AVI compatibility.
- Transcode videos without installing desktop software.
- Process sensitive footage privately — no file ever leaves your device.
- Batch-convert short clips quickly with no file size limits imposed by a server.
Frequently Asked Questions
Last updated: 2026-06-11 ·
Reviewed by Nham Vu