# MKVToolNix 103 released with GUI and mkvmerge improvements

> **Key takeaway:** MKVToolNix 103 open-source Matroska manipulation tool is now available with improvements to the GUI and mkvmerge.

**Published:** 2026-10-19T09:48:27+00:00 
**Source:** 9to5Linux 
**Category:** distro-news 
**Canonical URL:** https://fosswire.org/news/mkvtoolnix-103-released-with-gui-and-mkvmerge-improvements.html 

## Summary
MKVToolNix 103, codenamed "The Darkness," has been released. The update brings various improvements to the MKVToolNix GUI and mkvmerge, the command-line tool for merging multimedia streams into Matroska files. The software remains open source and is available for download.

## What changes in MKVToolNix 103
- GUI improvements unspecified in source
- mkvmerge improvements unspecified in source
- Codenamed "The Darkness"