AVI to MKV
Convert an AVI video to MKV. Compatible streams may be copied; other files require re-encoding. Check sound, duration and playback in the download.
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Accepts: video/x-msvideo, .avi · Max 1GB · always free
Uploads use TLS encryption. Server outputs are temporary and deleted after one hour. Download your result to keep it.
Choose your .AVI file to convert it to MKV.
Fast & Free
Convert files up to 1GB free with no account. Processing limits depend on the format and file contents.
Secure
Uploads use TLS encryption. Supported image conversions can run in your browser.
Check Your Result
Quality, transparency, and supported features depend on the output format. Keep your original file.
How to convert .AVI file to MKV
Upload Your File
Choose your .AVI file using the upload area. The maximum file size is 1GB; processing also depends on your device and the file's contents.
Check the Output Format
The target format is .MKV. Click Convert Now to start.
Download Your File
Download your .MKV file, open it to check the result, and keep your original.
About AVI to MKV
Content reviewed:
What changes when AVI becomes MKV
AVI and MKV are containers for encoded video and audio. Changing the container can make a file fit a particular workflow, but it does not guarantee that a TV or editing application supports the codecs inside. Check the target application before converting a large recording.
Stream copy or re-encoding
The server checks whether the detected codecs fit MKV and tries to copy compatible streams. If that path cannot be used, it falls back to H.264 video and AAC audio encoding. Re-encoding can change quality and size; lossless conversion is not guaranteed.
Verify your recording
Play the original first. After conversion, compare duration, picture and sound, including a section near the end. Additional tracks, subtitles and metadata are not guaranteed to transfer. Keep the AVI until you have verified the MKV.
If the AVI fails to convert
A damaged index or an unsupported older codec can cause trouble. Try exporting a fresh copy from the source editor. If the goal is broad playback support rather than an MKV requirement, consider AVI-to-MP4 and test it on the destination device.
Common reasons to convert .AVI file to MKV
- Meet an application requirement for an MKV container.
- Make an MKV copy of a legacy AVI while retaining the source.
Frequently Asked Questions
Is AVI-to-MKV always lossless?
No. Compatible codecs may be copied without re-encoding. Other inputs are re-encoded, which can change quality.
Will the file become smaller?
Not necessarily. A container change may leave the size similar. Encoding settings and the source determine the result; this is not a target-size compressor.
Does it run locally?
AVI-to-MKV uses server processing after upload. The maximum input file size is 1GB.