Why Convert AVI to MKV?
AVI files are legacy Windows video files that may not play on modern devices. Converting to MKV ensures your files work with the tools and platforms you need.
Method 1: Using a Free Online Converter
Go to a free online AVI to MKV converter (see recommendations below)
Upload your AVI file by clicking "Choose File" or dragging and dropping
Select MKV as the output format
Adjust quality settings if needed (bitrate, resolution, codec)
Click "Convert" and wait for the process to complete
Download your converted MKV file
Tip: For files over 500MB, use a desktop converter like HandBrake for faster processing and no file size limits.
Method 2: Using HandBrake (Free Desktop Tool)
Download and install HandBrake from handbrake.fr
Open HandBrake and click "Open Source" to select your AVI file
In the Summary tab, set the format to MKV
Choose your quality settings in the Video tab
Click "Start Encode" to begin conversion
Tip: Use H.265 (HEVC) codec for smaller file sizes with similar quality, or H.264 for maximum compatibility.
Method 3: Using FFmpeg (Command Line)
Install FFmpeg on your system (available for Windows, Mac, Linux)
Open a terminal and run: ffmpeg -i input.avi -c:v libx264 -c:a aac output.mkv
Wait for the conversion to complete
Verify the output file plays correctly
Warning: FFmpeg requires command-line knowledge. If you're not comfortable with the terminal, use HandBrake or an online converter instead.
AVI vs MKV — Key Differences
Understanding the differences between AVI and MKV helps you choose the right format for your needs. AVI files tend to be larger and less compressed than MP4. MP4 offers better compression and universal compatibility.
Frequently Asked Questions
**Will I lose quality converting AVI to MKV?** — Most modern converters preserve quality during conversion. Use high-quality settings to minimize any loss.
**How long does conversion take?** — It depends on file size and your hardware. Online converters typically take 1-5 minutes for a standard video. Desktop tools are usually faster.
**Is it free to convert AVI to MKV?** — Yes! All the tools recommended in this guide offer free conversion options.