Free & Instant

Convert AVI to MP4 Online — Free & Fast

Transform AVI video files to MP4 for smaller size and wider compatibility.

Upload your file

Drag & drop your .avi file here, or browse
Multiple files supported

.AVI.MP4

Maximum file size: 500 MB · Multiple files supported

100% private — files are processed in your browser, never uploaded

How It Works

AVI to MP4 in 4 Easy Steps

Convert AVI to MP4 in seconds — no sign-up, no upload, no catch.

  1. 1

    Upload AVI file

    Drop your .avi file or click Browse.

  2. 2

    MP4 auto-selected

    MP4 is pre-selected as the output format.

  3. 3

    Convert locally

    Your AVI video is re-encoded as MP4 in your browser.

  4. 4

    Download MP4

    Save your MP4 video.

Use Cases

Why convert AVI to MP4?

  • Play AVI videos on modern devices
  • Reduce AVI file sizes
  • Make AVI footage compatible with online platforms

Related Video Conversion Tools

Need to convert other formats? Try these popular free online tools.

.mp4.avi
MP4 to AVI
.mp4.mp3
MP4 to MP3
.mov.mp4
MOV to MP4
.mkv.mp4
MKV to MP4
.webm.mp4
WebM to MP4
.mkv.avi
MKV to AVI
.video.gif
Video to GIF

Why Convert AVI to MP4 with Mr. Converter?

Discover why millions of users trust Mr. Converter for fast, secure, and accurate AVI to MP4 file conversions directly inside their browser.

100% Private & Secure

  • ✓Zero File Uploads: Conversions execute locally on your machine using browser WebAssembly.
  • ✓No Cloud Storage: Your confidential data never touches remote servers or third-party databases.
  • ✓GDPR & Privacy Compliant: Complete end-to-end privacy for sensitive documents and media.

Lightning Fast & Unlimited

  • ✓Instant Processing: Skip queue wait times and server upload delays.
  • ✓No File Size Limits: Convert large AVI files without artificial size restrictions or paywalls.
  • ✓No Email Required: Instant direct downloads without registration or credit cards.

Format Comparison: AVI vs MP4

Feature / PropertyAVI FormatMP4 Format
Primary CategorySource Document / MediaTarget Converted File
Browser CompatibilityStandard Compatible100% Universal Support
File CompressionUncompressed / Original StructOptimized & Portable
Privacy & EncryptionPreserved during conversionEncrypted output supported
Typical Use CaseEditing & Content CreationSharing, Archiving & Publishing
FAQ

Frequently Asked Questions

MP4 compression may slightly reduce quality depending on the settings used.