Looking to convert AVI to MKV online for free? Change My File offers the best AVI to MKV converter that’s fast, secure, and easy to use. No software downloads, no registration—just upload your AVI file and get your MKV in seconds.

Why Choose Our Free AVI to MKV Converter?

At Change My File, we make it simple for anyone to convert AVI files to MKV format with ease. Whether you're converting videos for editing, streaming, or playback, our tool delivers high-quality MKV conversions every time.

No File Size Limits

Convert large AVI videos to MKV format without any restrictions.

100% Free and Online

No hidden fees. Our AVI to MKV converter is completely free to use.

Safe & Private

Your files are encrypted and automatically deleted after conversion.

Lossless Quality Conversion

We ensure your MKV file retains the same high video and audio quality as the original AVI file.

How to Convert AVI to MKV Online for Free?

Step-by-step guide:

Click on the "Upload AVI File" button
Select your .avi video file from your device
Wait for the file to upload and convert
Download your MKV file instantly

You don’t need any tech skills or special software—just a browser and your video file.

What Is an AVI to MKV Converter?

An AVI to MKV converter is a tool that allows you to convert AVI files (Audio Video Interleave) into MKV (Matroska Video) format. The MKV format is widely supported and more efficient for video compression, making it ideal for streaming, editing, and archiving.

Convert AVI to MKV Without Losing Quality

Unlike many tools that reduce video quality, Change My File lets you convert AVI to MKV without losing quality. We use advanced encoding methods to keep your video sharp, clear, and ready for professional use.

Why Convert AVI to MKV?

Smaller file size with same quality
Better compatibility with modern devices and players
Supports multiple audio and subtitle tracks
Ideal for uploading or sharing online

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Don’t waste time with slow or sketchy software. Use the best AVI to MKV converter online—free, fast, and reliable.

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Information about MKV

File extension

mkv

File category

Video

Stands for

Matroska Multimedia Container

Developer

Steve Lhomme

Overview

An unlimited amount of data such as an infinite number of audios, videos, pictures, arbitrary files like XML and subtitle tracks can be stored in MKV files. Although, it has a similar concept that of AVI, MP4; etc., yet, there is one difference. It is an open-source software or has open specifications, whereas, others are different. Furthermore, it allows online streaming and fast seeking which are alluring features. It can be used with ease as it is highly adaptive and can accept any audio and video.

Technical description

Files in MKV format store each track in varied dataline. Files in this format use distinctive extensions for storing the data. The extension .MKV is used only for video files(may have subtitles and audio),.MK3D for stereoscopic video, .MKA and .MKS for audio and subtitles respectively. The codecs that are linked to this format are .SRT, Vobsub, .USF(Universal Subtitle Format) and .SSA; etc. It should be noted that not all the media players support this file format but only selective ones like VLC. Besides this, ‘Matroska' is derived from a Russian word that is ‘Matryoshka’ and it refers to a hollow Russian doll which opens to uncover another doll, this doll then again opens to reveal next doll and the process goes on. Other meanings for this word in Russia are a sailor suit and a female sailor. Technical details in depth are available only for private and commercial use.

Links

wikipedia.org

Information about AVI

File extension

avi

File category

Video

Stands for

Audio Video Interleave

Developer

Microsoft

Overview

This file format stores both audio and video files for playback purposes. It is used to store files that are of high quality as file compression is less in this extension. Windows OS uses this as the default format to store multimedia files but other operating systems such as Linux, Unix and Mac also support this. The data in it is encoded by various codecs such as DivX and XviD. There is a variety of software that support these files. For instance- Microsoft Movies & TV, Windows Media Player and Apple QuickTime player; etc. Due to its low compression ability, it is widely used to make short movies, promos and advertisements; etc. It should be noted that AVI format result in large files that is why it is rarely used for video streaming.

Technical description

In AVI extension, file's data is divided into blocks or chunks as it is a sub-format of RIFF(Resource Interchange file format). An identification of each chunk is done by FourCC tag. File header and metadata of video(like height, width and frame rate) are identified by ‘hdrl tag' which is sub-chunk and it is mandatory. There is one another chunk which is also obligatory that is ‘movi tag' and it has actual audio or video data. The last sub-chunk is ‘idx1 tag' and it records the offsets of the data chunks. This ‘idx1 tag' is completely optional. There is one limitation of this format that it does not contain variable bitrate data.

Links

wikipedia.org

Free AVI to MKV Converter Online

Why Choose Our Free AVI to MKV Converter?

No File Size Limits

100% Free and Online

Safe & Private

Lossless Quality Conversion

How to Convert AVI to MKV Online for Free?

What Is an AVI to MKV Converter?

Convert AVI to MKV Without Losing Quality

Why Convert AVI to MKV?

Start Your AVI to MKV Conversion Now

Information about MKV

Information about AVI