Contact sales Start for free Go to app

AVI to MKV Converter Online

Turn any AVI file into MKV in seconds. Nothing to install, no watermark, 100% free.

Drop your file here to upload

The conversion didn't work. Try again or use another file.

Try again
Upload file

Click or drag & drop to upload your file

  • Free to try, no credit card
  • Rated 4.6 on G2

Why choose HappyScribe?

  • 40+ Formats

    Convert from AVI to MKV, plus 40+ other formats.

  • 100% Free

    No signups, no fees, no hidden restrictions. Convert AVI to MKV online for free.

  • Secure

    We take your security seriously. All file transfers use 256-bit SSL encryption.

  • Online

    No installs needed; convert AVI to MKV right from your browser, on any device, anytime.

How to convert AVI to MKV?

  1. Upload your AVI file

    Start by dragging and dropping your AVI file into the upload area, or click to browse your device and select your file in the list.

  2. Choose MKV format

    Next, pick MKV as the format you’d like to convert your file into. We support 40+ formats in total. When you’re ready, hit the Convert button.

  3. Download your converted MKV

    Once the conversion is complete, you’ll get a download link right away. Just click to save the file to your device. It’s fast, easy, and doesn’t require any software installation.

What is AVI?

Audio Video Interleave (AVI) is Microsoft’s venerable multimedia container introduced with Video for Windows. It stores audio and video streams in interleaved RIFF chunks, allowing simple players to read sequentially from disk. While it supports multiple codecs, it lacks modern features like B‑frame timestamping and embedded subtitles. Released in 1992 to counter Apple’s QuickTime, AVI became ubiquitous on Windows 95 thanks to the Indeo and Cinepak codecs. The rise of DivX in 1999 rejuvenated AVI for internet sharing, but mismatched VBR audio led to sync headaches. Microsoft replaced it with ASF/WMV and eventually MP4, yet legacy camcorders and CCTV systems still output AVI.

What is MKV?

Matroska Video (MKV) is a flexible open container that can accommodate virtually any codec, multiple subtitle tracks, and chapter points. It is built on EBML (Extensible Binary Meta Language), a binary cousin of XML, allowing unlimited, self‑describing elements. The project began in 2002 after developer Steve Lhomme forked the failed MCF container. With the explosion of H.264 ‘fansubs’, MKV became the default wrapper for anime communities, bundling soft‑subs and styled karaoke effects. In 2013 Matroska was standardised within the IETF as the basis for WebM, cementing its longevity.

Free Online AVI to MKV Converter

HappyScribe’s free AVI to MKV converter changes the format of an audio or video file online. Upload the file, choose MKV and download the result, usually within seconds. When both formats can hold the same audio and video streams, we copy them without re-encoding, so there is no quality loss. There is no signup or watermark, and files are deleted from our servers one hour after processing.

Need to convert your file from AVI to MKV? It’s simple. Just upload your file, choose the output format, and click ‘Convert’. That’s it — no downloads, no complicated software, and no hidden costs. Our tool is designed to be fast, secure, and completely free, so you can turn your files into the format you need in seconds.

Whether you’re converting audio for sharing, editing, or playback on different devices, our converter ensures high-quality output every time. After your conversion, you’ll also have the option to transcribe video to text, making it easy to turn your MKV files into accurate, editable text in just a few clicks.

Frequently Asked Questions

Is the AVI to MKV converter really free?

Yes. There is no account, no watermark and no limit on the number of files.

Will converting AVI to MKV reduce quality?

Not when both formats support the same codecs: we copy the streams without re-encoding. When a re-encode is needed, quality stays close to the original for everyday use.

How long does it take?

Most files are ready in a few seconds. Long or high-resolution videos take longer, mostly depending on upload speed.

Can I convert a YouTube link?

No. The converter works with files on your device. It does not download from YouTube or other sites.

How to open a AVI file?

Windows Media Player, VLC, and MPC‑HC open most AVI files. If the clip uses an obscure four‑character codec (FourCC), install the corresponding VFW decoder or remux to MKV with FFmpeg. Adobe Premiere Pro and DaVinci Resolve import AVI but may transcode on the timeline for GPU effects.

How to open a MKV file?

VLC, MPV, and Kodi handle MKV flawlessly on every OS. Editing suites such as DaVinci Resolve import common codecs like H.264 or ProRes within MKV, but for delivery you may still export MP4. MKVToolNix lets you split, merge, and tag tracks without re‑encoding.

More format converters

Discover Related tools

Related articles