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Convert AVI to MP4 Online

Swap Formats

Convert AVI files to MP4 instantly in your browser. Free, fast, and 100% private - your files never leave your device. No account or software required. Supports batch conversion and custom settings.

Choose AVI files or drag & drop

Multiple files supported · No file size limit

100% PrivateNo UploadFree

Video Settings

How to Convert AVI to MP4 - 3 Simple Steps

1

Upload Your AVI File

Drag and drop your AVI file into the upload area above, or click to browse your device. You can upload multiple files at once for batch conversion.

2

Adjust Settings

Set your preferred quality, resize dimensions, or other format-specific options. The default settings are optimized for the best MP4 output.

3

Download MP4 File

Click Convert and your MP4 file is ready instantly. Download individual files or click "Download All as ZIP" for batch results.

AVI vs MP4 — Format Comparison

FeatureAVIMP4
File SizeLarge (legacy container)Medium (H.264/H.265)
CompressionLossyLossy
Transparency (Alpha)✗ Not supported✗ Not supported
Animation✓ Supported✓ Supported
Vector-based✗ No (raster)✗ No (raster)
Browser SupportLimited (older format, requires codecs)All major browsers
Best ForLegacy Windows applications, older media playersVideo sharing, streaming, social media, web playback

Also Convert AVI to:

AVI → WEBMAVI → MOVAVI → GIF

Convert Other Formats to MP4:

GIF → MP4WEBM → MP4MOV → MP4

Why Use ConvertTheFile for AVI to MP4?

🔒

100% Private

Files are converted in your browser and never uploaded to any server.

⚡

Instant Conversion

No waiting for uploads or server processing. Results are instant.

🆓

Completely Free

No limits, no watermarks, no account required - forever free.

📦

Batch Conversion

Convert multiple files at once and download them as a ZIP archive.

Frequently Asked Questions — AVI to MP4 Converter

How do I convert AVI to MP4 online?
Upload your AVI file by dragging it into the upload area or clicking to browse your files. click Convert. Your MP4 file will be ready to download in seconds — no account or software required.
Is it safe to convert AVI files to MP4 online?
Completely safe. This converter runs entirely in your browser. Your AVI files are never uploaded to any server — conversion happens locally on your device using browser APIs. Files are not stored or shared.
What is the difference between AVI and MP4?
AVI is best for: Legacy Windows applications, older media players. MP4 is best for: Video sharing, streaming, social media, web playback.
Is this AVI to MP4 converter free?
Yes, completely free with no limits. There is no registration, no watermarks, no file size limit beyond what your browser can handle, and no hidden charges.
Can I batch convert multiple AVI files to MP4?
Yes. Upload multiple AVI files at once — each is converted separately and you can download all results as a ZIP archive.
How long does AVI to MP4 conversion take?
Video conversion is the most CPU-intensive. A 1-minute 1080p video may take 2–10 minutes depending on your device. Processing happens entirely in your browser.

About AVI (Audio Video Interleave)

AVI is Microsoft's legacy container format supporting various codecs. While older, it remains common in Windows environments and older media players.

Learn more about AVI →

About MP4 (MPEG-4 Part 14)

MP4 is the most universal video format, combining H.264/H.265 video with AAC audio. Supported by virtually every device, browser, and platform.

Learn more about MP4 →