AVI to MP4
Convert AVI video to MP4.
Video re-encoding is CPU-intensive — expect roughly real-time speed, so a few minutes for a few minutes of footage.
Trim options
Trim applies to every file in the queue. Leave blank to keep the full length.
This free AVI to MP4 converter re-encodes older AVI video into modern MP4 (H.264 video + AAC audio), producing dramatically smaller files with far wider support. There is no size limit, no queue, and no signup.
AVI is a legacy container from the DivX/Xvid era that many phones, browsers, and editors no longer play cleanly. MP4 with H.264 is the universal standard: it streams on the web, plays on iPhone and Android, drops straight into video editors, and uploads to YouTube, Instagram, and messaging apps without a second conversion.
Features
- · Drag-and-drop or click to load an AVI file
- · Quality control (CRF) from near-lossless to smallest size
- · Resolution presets — 1080p, 720p, 480p, 360p, or keep original
- · Frame-rate control — 60, 30, 24, 15 fps, or keep original
- · Trim to a start and end point before converting
- · Remove the audio track entirely for a silent MP4
- · Live progress bar and in-page video preview of the result
- · One-click download — no watermark, no account
How to convert AVI to MP4
- 1. Drop your AVI file onto the box above, or click to browse for it.
- 2. Optional: set the quality, resolution, frame rate, or trim points.
- 3. Click Convert to MP4 and watch the progress bar.
- 4. Preview the result in place, then download your MP4.
Why convert in your browser
Many AVI converters cap the free file size (often 100 MB to 1 GB), queue you behind other users, and stamp the output with a watermark unless you pay. Here none of that applies: the only size limit is your own hardware, and the full-quality output is always free.
Frequently asked questions
Is this AVI to MP4 converter really free?
Yes. There is no signup, no watermark, no email, and no daily conversion cap. Every option — quality, resolution, frame rate, trimming — is available at no cost.
Are my files uploaded to a server?
The conversion runs with an in-page media engine (ffmpeg compiled to WebAssembly), so there is no file-size limit and nothing to delete afterwards.
Is there a maximum file size?
There is no fixed limit. The practical ceiling is your device memory rather than an upload quota. Multi-gigabyte AVI files work on most modern machines.
Why is video conversion slower than an upload site?
The re-encode happens on your CPU, so expect roughly real-time speed — a few minutes of footage takes a few minutes.
What codecs does the output MP4 use?
Video is encoded as H.264 and audio as AAC — the most widely supported MP4 combination, playable on iPhone, Android, Windows, macOS, and every major browser and social platform.
Can I shrink the file or keep maximum quality?
Both. The quality control maps to the encoder CRF: choose High for near-lossless output, Balanced for the default, or Smaller/Smallest to prioritise file size. Lowering the resolution or frame rate reduces size further.