How to Convert AVI to MP4 Free Online (No Watermark)

How to Convert AVI to MP4 Free Online (No Watermark)

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AVI is an old format — most modern platforms won’t accept it. iPhones can’t play AVI natively. YouTube, TikTok, and Instagram reject AVI uploads. MP4 is the universal standard that plays on every device, every platform, every media player. Here’s how to convert for free.

Method 1: AllMediaTools Video Converter (Online, No Watermark)

  1. Open AllMediaTools Video Converter.
  2. Upload your AVI file.
  3. Select MP4 as output format.
  4. Choose quality (keep original for best results).
  5. Click Convert and download the MP4.
Convert AVI to MP4 Free →

Method 2: VLC Media Player (Free Desktop App)

  1. Download VLC from videolan.org.
  2. Open VLC → Media → Convert/Save (Ctrl+R).
  3. Add your AVI file and click Convert/Save.
  4. Select Profile: Video – H.264 + MP3 (MP4).
  5. Set destination file ending in .mp4 and click Start.

Method 3: FFmpeg (Command Line, Batch Conversion)

# Convert single file
ffmpeg -i input.avi output.mp4

# Batch convert all AVI files in a folder
for f in *.avi; do ffmpeg -i "$f" "${f%.avi}.mp4"; done

Does Converting AVI to MP4 Reduce Quality?

Slightly, but imperceptibly in most cases. Re-encoding at typical settings (H.264, quality 80+) produces output that looks identical to the original at normal viewing sizes. The key rule: always convert from the original file, not from a previously-converted copy — every conversion round trip adds a small amount of quality loss.

Frequently Asked Questions

Will the converted file play on iPhone?

Yes. iPhone and iPad natively play MP4 files in the Files app, Photos app, and most third-party players.

Does converting change the resolution?

No, unless you specifically choose to resize. The converter maintains original dimensions.

Why is the converted MP4 larger than the original AVI?

This can happen if the original AVI was already heavily compressed. The MP4 re-encode used a higher bitrate. Reduce by compressing the resulting MP4 using AllMediaTools Video Compressor.

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