How to Convert AVI to MP4 — Quick & Free
Fast, instant AVI to MP4 conversion. No signup required. Just drop your .avi file and get .mp4 in seconds.
Batch Settings
Generation loss — quality may degrade
AVI uses lossy compression, and so does MP4. Converting means decoding and re-encoding — each cycle can permanently degrade quality. Convert from the original source file whenever possible.
Some metadata may not survive
Your AVI file may contain RIFF chunks metadata. MP4 has limited or no support for these metadata types. Location data (GPS), camera settings, and color profiles may be stripped during conversion.
What compression artifacts to expect
MP4 lossy compression can produce blockiness, banding in gradients, mosquito noise. At the high quality settings CocoConvert uses by default, these are usually invisible to the eye. Lower quality settings trade visual fidelity for smaller file sizes.
还在为AVI文件兼容性发愁吗？无论是电脑上的老游戏录像，珍藏多年的家庭DV片段，还是朋友发来的经典电影，AVI格式有时确实会给分享和播放带来不便。特别是在我们常用的微信、抖音等社交平台上，或者想在手机、平板上随时随地观看时，AVI文件常常会遇到无法直接播放或上传受限的问题。将AVI转换为MP4，不仅能大幅提升文件的兼容性，让它在各类设备和平台上畅通无阻，还能有效减小文件体积，方便您传输和存储。告别繁琐的格式困扰，让您的视频内容真正实现无界限分享和播放，享受更流畅的数字生活体验。
- 微信分享老游戏精彩瞬间
- 将家庭DV转存到手机相册
- 优化在线课程录屏，方便上传学习平台
在中国大陆，由于早期播放器和摄像设备偏好，AVI格式曾较为流行。但随着移动互联网普及，MP4因其出色的压缩效率和广泛兼容性，已成为主流，尤其适合微信等社交媒体分享。
About AVI to MP4 Conversion
Short answer: yes, you can convert AVI to MP4 online for free, and some quality differences may occur depending on the format types. Just upload your .avi file to CocoConvert, pick MP4 as the output, and click Convert. The whole process takes seconds.
Now for the details. AVI (Audio Video Interleave) is Microsoft's legacy video container, widely compatible but often large. MP4 (MPEG-4 Part 14) is the universal video container supporting H.264/H.265 codecs — plays on virtually every device. Converting between these two formats lets you convert between formats quickly.
Full Name: AVI uses Audio Video Interleave, while MP4 uses MPEG-4 Part 14. Compression: AVI uses Lossy, while MP4 uses Lossy. Color Depth: AVI uses 8-bit, while MP4 uses 8-bit (H.264) or 10-bit (H.265/AV1).
Your AVI file is decoded and re-encoded as MP4. AVI uses lossy compression, and so does MP4. Converting means decoding and re-encoding — each cycle can permanently degrade quality. Convert from the original source file whenever possible.
Common misconception: ""I'll convert to MP4 and then back to AVI — it'll be the same"" — in reality, each lossy conversion cycle permanently degrades quality. going avi → mp4 → avi will produce a noticeably worse file than the original. always keep your source file.
CocoConvert runs entirely online — no software to install, no account to create. Your files are encrypted during upload (TLS), processed on isolated servers in Germany, and permanently deleted after 24 hours. It works in Chrome, Safari, Firefox, Edge, and all mobile browsers.
Need to convert more than one file? Free users can do 5 per hour. Pro gets 100 per hour with files up to 5 GB each.
How to Convert AVI to MP4
- 1
1. Upload AVI
Drop your .avi file onto the page (or tap "Browse" on mobile). Add multiple files for batch conversion.
- 2
2. Select MP4
Choose .mp4 from the output dropdown. Settings are pre-configured for best results.
- 3
3. Convert
One click. The server handles all the heavy lifting using FFmpeg and Sharp.
- 4
4. Download
Your .mp4 file is ready. Download it directly or get all files as a zip archive.
What Happens When You Convert AVI to MP4
Your AVI video is transcoded — video and audio streams are decoded and re-encoded into the MP4 container. This is a lossy process that takes time proportional to the video duration.
Your AVI file is demuxed — video, audio, and subtitle streams are separated
The video stream is decoded frame-by-frame, then re-encoded with MP4-compatible codecs (typically H.264 for MP4)
The audio stream is decoded and re-encoded (or copied if the codec is compatible)
Subtitle and chapter data is preserved where the target supports it
Streams are muxed into the MP4 container and the file is saved
AVI vs MP4 — Detailed Comparison
| Feature | .AVI | .MP4 |
|---|---|---|
| Full Name | Audio Video Interleave | MPEG-4 Part 14 |
| Compression | Lossy | Lossy |
| Color Depth | 8-bit | 8-bit (H.264) or 10-bit (H.265/AV1) |
| HDR Support | No | Yes |
| Typical File Size | 100–500 MB per minute (uncompressed can be much larger) | 50–200 MB per minute (1080p H.264) |
| Platform Support | Universal | Universal |
| Browser Support | none | Universal |
| Year Created | 1992 | 2001 |
| Open Standard | No | Yes |
Should You Convert AVI to MP4?
When to Convert
- ✓You need a file that works in web browsers
- ✓You need maximum device and software compatibility
When NOT to Convert
- ✗You're converting just because the file "seems old" — re-encoding lossy-to-lossy always degrades quality
Common Mistakes When Converting AVI to MP4
"I'll convert to MP4 and then back to AVI — it'll be the same"
Each lossy conversion cycle permanently degrades quality. Going AVI → MP4 → AVI will produce a noticeably worse file than the original. Always keep your source file.
Frequently Asked Questions
Is AVI to MP4 conversion free?
Yes. CocoConvert offers free AVI to MP4 conversion with generous daily limits — 25 minutes of processing time and up to 5 files per hour (250 MB each). Pro plans remove these limits.
How fast is AVI to MP4 conversion?
Most files convert in 2–10 seconds depending on size. Large video files may take 30 seconds. Batch jobs process in parallel for maximum speed.
What happens to my files after conversion?
Your uploaded AVI file and the converted MP4 file are both automatically deleted from our servers within 24 hours. They are never shared, sold, or analysed.
Does converting AVI to MP4 lose quality?
AVI uses lossy compression, and so does MP4. Converting means decoding and re-encoding — each cycle can permanently degrade quality. Convert from the original source file whenever possible.
Can I convert MP4 back to AVI?
Yes, CocoConvert supports MP4 to AVI conversion as well. However, if the original conversion involved lossy compression, converting back won't recover the lost data.
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