AVI to MKV — No Upload, No Watermark

Why convert AVI to MKV?

Moving an AVI archive into Matroska is a preservation decision. MKV is open, actively maintained and can hold multiple audio tracks, subtitles and chapters that AVI's 1992 design has no room for.

AVI is a Microsoft container from 1992. Old camcorders, screen recorders and archives are full of it, but it lacks modern streaming features and produces large files.

When AVI → MKV is the right move

Consolidating a legacy video archive into a modern open container.
Adding subtitle or multiple audio tracks to old footage.
Preparing files for a media server such as Plex or Jellyfin.

Quality, size and what changes

When the codecs allow it, the streams are carried across without re-encoding, so quality is identical and the process is fast. MKV also handles variable frame rate and long files far more gracefully than AVI.

What you gain with MKV: Unlimited tracks, subtitles and chapters in one open, patent-free container.

How it works

Drop your AVI file above and Morphio decodes it locally, then re-encodes it as MKV using WebAssembly + the browser's native codecs. Nothing is ever uploaded — your files stay on your device. Batch as many files as your machine can handle. See exactly how in-browser conversion works.

AVI to MKV — frequently asked questions

How do I convert AVI to MKV without uploading the file?

Open the AVI to MKV page, drop your video on the drop zone and press convert. Morphio runs an FFmpeg build compiled to WebAssembly that runs inside the page, so the AVI data never leaves your device and no server ever receives a copy.

Does converting AVI to MKV lose quality?

Audio and video tracks are re-encoded together, so the result stays in sync and plays on standard players. Converting AVI to MKV only rewrites the container and encoding you asked for — the source file on your disk is never modified.

Is the AVI to MKV converter free, and how big can the file be?

Yes. The free plan covers 10 conversions a day with files up to 200 MB and adds no watermark or sign-up. Morphio Pro ($5/month, or $29 once for lifetime access) removes the daily cap and raises the per-file limit to 5 GB.

Is quality affected?

No — this is primarily a container change, so the video stream itself is preserved.

Will MKV play on my TV?

Many media players and servers handle MKV, but for a smart TV or phone, MP4 remains the more reliable target.

AVI to MKV Converter

Your Vault is empty