Convert AVI to MKV
Convert AVI to MKV online for free. Upload your AVI and get a high-quality MKV in seconds. No install, no watermark, files deleted automatically.
Free online AVI to MKV converter
Convert AVI to MKV in a few clicks. Add your AVI above, and Tool Cloud converts it on our servers and gives you a MKV to download, with no software to install and no watermark.
How to convert AVI to MKV
- 1
Upload your AVI file
Click "Select Files" or drag and drop your AVI into the upload box.
- 2
Adjust the options
Optionally pick quality, size or other settings for your MKV output.
- 3
Download your MKV
Click "Process", wait a few seconds, then download your converted MKV.
About the formats
AVI is an older Microsoft video container. It is widely supported on Windows but files are often large and some players and phones handle it poorly.
MKV is a flexible open video container that can hold multiple audio tracks and subtitles. It is popular for movies and series, but not every device or editor supports it.
Frequently asked questions
How do I convert AVI to MKV?
Add your AVI above, click "Process", and download the MKV when it is ready. It usually takes just a few seconds.
Is the AVI to MKV converter free?
Yes. Each use costs 6 credits, and everyone gets 20 free credits every day without an account. Sign up to get 50 free credits, or buy a credit pack if you need more.
Will converting AVI to MKV reduce quality?
Both AVI and MKV use lossy compression. Tool Cloud converts at a high quality setting by default, so the difference is usually not noticeable.
Are my files safe?
Yes. Your files are only accessible to you, are transferred over an encrypted connection, and are deleted automatically after processing.
Can I convert multiple AVI files to MKV at once?
Yes. Select several files at once and Tool Cloud converts them all. You can download each MKV when it is ready.
Fast, private and built for real work
Everything runs on our servers, so it works the same on any device.
Lightning fast
Files are processed in seconds by a dedicated worker queue, with live progress while you wait.
High quality output
Professional-grade engines like FFmpeg and Pillow keep your output crisp and faithful.
Secure & private
Uploads are only visible to you and are deleted automatically after processing.
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