You can remove subtitles from an MKV file without re-encoding the entire video

MKV files (Matroska Video) can hold multiple subtitle tracks alongside the video and audio. To remove them, you do not need to re-encode the video — you can extract the video and audio streams you want to keep and discard the subtitle tracks entirely. The fastest method uses MKVToolNix, a free tool that lets you pick which tracks stay and which go, then saves a new file with only what you selected.

The process takes about five to fifteen minutes depending on your file size, and the result is a smaller file with no subtitles. You will need a computer (Windows, Mac, or Linux), the MKV file itself, and MKVToolNix installed.

Key Takeaways

  • MKVToolNix is the most straightforward tool for removing subtitles from MKV files without re-encoding the video, and it works on Windows, Mac, and Linux.
  • The process involves opening your MKV file in MKVToolNix, unchecking the subtitle tracks you want to remove, and saving a new file with only the tracks you selected.
  • Removing subtitles this way does not re-encode the video, so the file processes quickly and the video quality stays identical.
  • If you want to keep some subtitles but remove others, you can uncheck only the tracks you do not want instead of removing all of them.

Install MKVToolNix on your computer

Go to mkvtoolnix.read and read the installer for your operating system. If you use Windows, read the .exe file. If you use Mac, read the .dmg file. If you use Linux, your package manager (apt, yum, or pacman depending on your distribution) likely has MKVToolNix available — search for "mkvtoolnix" in your software center or run the install command for your system.

Run the installer and follow the on-screen prompts. On Windows and Mac, this means clicking through a few dialog boxes and choosing where to save the program. The default location works fine. Once installation finishes, you can open MKVToolNix from your Applications folder (Mac), Start menu (Windows), or process launcher (Linux).

Open your MKV file in MKVToolNix

Launch MKVToolNix. You will see a window with a large empty area and a button labeled "Add source files" or a plus icon. Click that button and navigate to the MKV file you want to edit. Select it and click Open.

The program will scan the file and display all the tracks it contains. You will see a list showing video tracks (usually one), audio tracks (often multiple languages), and subtitle tracks (the ones you want to remove). Each track appears as a row with a checkbox next to it.

Uncheck the subtitle tracks you want to remove

Look at the list of tracks. Subtitle tracks are usually labeled "Subtitle" or "S:" followed by a language code like "eng" (English) or "spa" (Spanish). Find each subtitle track and click the checkbox next to it to uncheck it. Leave the video and audio tracks checked — those are what you want to keep.

If your file has multiple subtitle tracks in different languages and you want to remove all of them, uncheck every row labeled as a subtitle. If you want to keep one subtitle track and remove the others, uncheck only the ones you do not want. The checked tracks are the ones that will appear in your new file.

Choose where to save the new file

At the bottom of the MKVToolNix window, you will see a field labeled "Output" or "Destination". Click in that field and choose where you want to save the new MKV file. You can save it in the same folder as the original or in a different location. The program will suggest a name like "original_filename-new.mkv" — you can change this to whatever you prefer, but keep the .mkv extension.

Do not save over the original file unless you are certain you will not need it again. It is safer to save the new file with a different name so you have both versions until you confirm the new one works correctly.

Start the process and wait for it to finish

Click the "Start multiplexing" or "Start" button (the exact label depends on your version of MKVToolNix). A progress window will appear showing how much of the file has been processed. The speed depends on your computer and file size — a two-hour movie might take five to fifteen minutes.

Do not close the program or move the file while it is processing. When the progress bar reaches 100 percent, the new file is ready. Open your file manager and navigate to the output folder to confirm the new MKV file exists and is smaller than the original (since you removed the subtitle data).

Verify the new file plays correctly

Open the new MKV file in your video player to confirm it plays and that the subtitles are gone. The video and audio should be identical to the original — only the subtitle tracks have been removed. If the file plays correctly, you can delete the original file if you want to save disk space.

If something went wrong and the new file does not play, the original is still intact. You can try the process again, making sure you selected the correct tracks to remove. Common mistakes include accidentally unchecking the video or audio track instead of the subtitles — if that happens, just repeat the steps and check the right boxes this time.

Frequently Asked Questions

Will removing subtitles make the video quality better or the file smaller?

The video quality stays exactly the same because you are not re-encoding it. The file will be slightly smaller because subtitle data takes up space, but the reduction is usually modest — typically 5 to 50 megabytes depending on how many subtitle tracks were in the original file.

Can I remove some subtitles but keep others?

Yes. In MKVToolNix, uncheck only the subtitle tracks you want to remove and leave the others checked. The file will contain only the tracks you selected, so you can keep English subtitles and remove Spanish ones, for example.

What if I accidentally remove the audio or video track instead of subtitles?

The original file is not changed, so you can open it again in MKVToolNix and repeat the process with the correct tracks selected. Just make sure the video and audio rows stay checked and only the subtitle rows are unchecked.

Does this method work on Mac and Linux, or only Windows?

MKVToolNix works on Windows, Mac, and Linux. The steps are the same on all three — read the installer for your operating system, install it, and follow the same process to remove subtitles.

What if my MKV file has no subtitles to begin with?

If you open the file in MKVToolNix and see only video and audio tracks with no subtitle rows, the file already has no subtitles. You do not need to do anything — the file is already in the state you want.