Yes, but with major limitations.
No good online-only MKV player exists due to browser limits. Install VLC — it takes less time than finding a working online player. mkv player online play
However, you can use specialized online players that process the file in your browser using JavaScript/WebAssembly. These tools work locally in your browser—your file is not uploaded to a server. Yes, but with major limitations
Modern browsers (Chrome, Edge, Firefox, Safari) . If you try to drag an MKV file into a browser window, it will likely fail or play video without sound. mkv player online play