Convert AVI to MP4 Online Free
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# What is a AVI file?
AVI is one of the oldest video formats. It provides high-quality video but typically results in much larger file sizes compared to modern formats like MP4 due to less efficient compression. AVI is one of the oldest video formats, introduced by Microsoft in the 90s. Because it's so old, modern smartphones (especially iPhones) and web browsers simply do not know how to play it natively.
# Why convert to MP4?
MP4 is the most universally supported video format. It uses advanced compression to provide high-quality video and audio while maintaining a relatively small file size. Perfect for web streaming, mobile devices, and social media. Converting AVI to MP4 modernizes your old video archives. MP4 uses advanced H.264 compression, meaning your videos will look just as good but take up significantly less space and play perfectly on iOS, Android, and macOS.
Convert AVI to MP4 online in seconds with NexusConvert. 100% free, no signup required. Preserve quality with fast, secure cloud processing.
Technical Details
| Specification | Source (AVI) | Target (MP4) |
|---|---|---|
| Format Name | Audio Video Interleave | MPEG-4 Part 14 |
| Media Type | Video | Video |
| Developer | Microsoft | Moving Picture Experts Group |
How to convert AVI to MP4 in 3 easy steps
1. Upload your AVI file
Drag and drop your file into the upload area above, or click to select a file from your computer.
2. Choose conversion settings
Select MP4 as your target format. You can also adjust advanced settings like quality or apply AI enhancements if needed.
3. Download your MP4
Click 'Convert Now'. Our cloud engines will process your file instantly. Once done, simply click download.
Why use NexusConvert?
Lightning Fast
We use dedicated cloud infrastructure and WebAssembly to ensure your files are converted in milliseconds.
Bank-Grade Security
All file transfers are protected by 256-bit SSL encryption. We never look at your files or use them to train AI models.
No Registration Needed
You don't need to create an account or give us your email to use the converter. Just upload and convert immediately.
Automate AVI to MP4
Integrate blazing-fast conversion directly into your app with our REST API. No complex setup required. Test for free.
1import requests2import time34API_KEY = "YOUR_API_KEY"5headers = {"Authorization": f"Bearer {API_KEY}"}67# 1. Upload File8with open("input.avi", "rb") as f:9 upload_res = requests.post(10 "https://nexus-convert.com/api/v1/files/upload", 11 headers=headers, 12 files={"file": f}13 ).json()1415file_id = upload_res["id"]1617# 2. Start Conversion Job18job_res = requests.post(19 "https://nexus-convert.com/api/v1/jobs", 20 headers=headers, 21 json={"file_id": file_id, "target_format": "mp4"}22).json()2324job_id = job_res["job_id"]2526# 3. Poll for Completion27while True:28 status = requests.get(29 f"https://nexus-convert.com/api/v1/jobs/{job_id}", 30 headers=headers31 ).json()32 33 if status["status"] == "finished":34 break35 time.sleep(1)3637# 4. Download Result38result = requests.get(39 f"https://nexus-convert.com/api/v1/jobs/{job_id}/download", 40 headers=headers41)42with open("output.mp4", "wb") as f:43 f.write(result.content)4445print("Conversion complete!")