1. Upload your AVI file
Start by dragging and dropping your AVI file into the upload area, or click to browse your device and select your file in the list.
AVI to MP4 Converter Online
Convert your AVI (.avi) file to MP4 (.mp4) in seconds straight from your browser. No installs. No watermarks. 100 % free.
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47+ Formats
Convert from AVI to MP4 but also 47+ other formats.
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No signups, no fees, no hidden restrictions. Convert AVI to MP4 directly in your browser for free.
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How to convert AVI to MP4?
2. Choose MP4 format
Next, pick MP4 as the format you’d like to convert your video into. Alternatively, we support +47 formats that you can choose from. When you’re ready, hit the Convert button.
3. Download your converted MP4
Once the conversion is complete, you’ll get a download link right away. Just click to save the file to your device. It’s fast, easy, and doesn’t require any software installation.
What is a AVI file?
Audio Video Interleave (AVI) is Microsoft’s venerable multimedia container introduced with Video for Windows. It stores audio and video streams in interleaved RIFF chunks, allowing simple players to read sequentially from disk. While it supports multiple codecs, it lacks modern features like B‑frame timestamping and embedded subtitles. Released in 1992 to counter Apple’s QuickTime, AVI became ubiquitous on Windows 95 thanks to the Indeo and Cinepak codecs. The rise of DivX in 1999 rejuvenated AVI for internet sharing, but mismatched VBR audio led to sync headaches. Microsoft replaced it with ASF/WMV and eventually MP4, yet legacy camcorders and CCTV systems still output AVI.
What is a MP4 file?
MP4 (MPEG‑4 Part 14) is the dominant container for online video. Based on QuickTime atoms, it can hold H.264/AVC, HEVC, AV1, AAC, AC‑3, timed text, and fragmented segments for adaptive streaming. Finalised in 2001 and revised in 2003 (ISO/IEC 14496‑14), MP4 became the hand‑off format of choice thanks to the iPod Video and PlayStation Portable. The arrival of HLS and DASH further entrenched MP4, which supports ‘moov’ boxes at either head or tail for progressive download or live streams.
Free Online AVI to MP4 Converter
Need to convert your audio file from AVI to MP4? It’s simple. Just upload your file, choose the output format, and click ‘Convert’. That’s it — no downloads, no complicated software, and no hidden costs. Our tool is designed to be fast, secure, and completely free, so you can turn your files into the format you need in seconds.
Whether you’re converting audio for sharing, editing, or playback on different devices, our converter ensures high-quality output every time. After your conversion, you’ll also have the option to transcribe video to text, making it easy to turn your MP4 files into accurate, editable text in just a few clicks.
Frequently Asked Questions
How to open a AVI file?
Windows Media Player, VLC, and MPC‑HC open most AVI files. If the clip uses an obscure four‑character codec (FourCC), install the corresponding VFW decoder or remux to MKV with FFmpeg. Adobe Premiere Pro and DaVinci Resolve import AVI but may transcode on the timeline for GPU effects.
How to open a MP4 file?
Virtually every player from Safari and Chrome to Xbox and Roku handles MP4. When editing, DaVinci Resolve and Final Cut Pro will optimise H.264 to intraframe proxies for smoother scrubbing. HandBrake transcodes old codecs like DivX to modern H.264+AAC MP4 profiles.
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