How to Merge SRT Subtitles with MKV using MKVToolNix

Published by Nyau Wai Hoe - Updated on

Since we can watch movies from all around the globe, it’s pretty handy to have subtitles on our videos. SubRip Text (SRT) files are simple text files that carry subtitle info, like when each subtitle should pop up and disappear. If you’ve got a video file in MKV format and a subtitle file in SRT format, and you want to put them together, MKVToolNix is a great tool for the job.

MKVToolNix is a free program that’s packed with tools to work with MKV files, like “mkvmerge,” “mkvinfo,” “mkvextract,” “mkvpropedit,” and “mmg.” It lets you combine MKV videos and SRT subtitles easily, making sure your subtitles fit perfectly with your videos.

How to Merge SRT Subtitles with MKV

Some basics about MKV files and SRT subtitles

MKV, or ‘Matroska Video’, is a flexible file type that can store loads of video, audio, images, or subtitles in one place. It’s a go-to for movies or TV shows.

SRT, or ‘SubRip Subtitle’ files, are straightforward text files that hold subtitles. They’re easy to make and edit, which is why a lot of people like using them.

Also see: How to Extract SRT Subtitles From MKV using MKVToolNix

What are MKV and SRT files

Why merge SRT subtitles onto an MKV video?

Technically speaking, having your subtitles directly in the video file means they’re always there, no matter what device or media player you’re using, since they become part of the video itself.

Plus, MKV is super versatile, supporting many audio tracks and subtitles, which is perfect for videos that need subtitles in different languages, letting viewers choose their preferred language easily.

Alternative method: How to Merge Subtitles With Video Permanently Using VLC

Audio and subtitle tracks an MKV file can contain

First steps: Getting MKVToolNix on your computer

First off, you need to download and install MKVToolNix. It’s available for Windows, MacOS, and Linux.

  1. Head over to the MKVToolNix website:
  2. Click on “Downloads” and pick the version that matches your system.
  3. Follow the instructions on your screen to get it installed.Installing MKVToolNix

Useful tip: How to Download Subtitles in VLC on Windows 11

How to combine SRT subtitles with your MKV video

Now, let’s walk through how to merge your SRT subtitles with the MKV video file.

  1. Open “MKVToolNix GUI” from where you installed it or run the “mkvtoolnix-gui.exe” file from its folder.How to open and run MKVToolNix
  2. In the program, look for the “Source files” section on the right. Drag your MKV video and SRT subtitle files there.Add SRT to MKV file
  3. Once you add the files, you’ll see them listed. Normally, everything is set to merge. If there’s anything you don’t want to include, just uncheck it.Remove subtitles or audio tracks from MKV
  4. Down at the bottom, there’s a spot for “Output file.” Click the folder icon next to it to choose where to save your MKV file with the subtitles.Output destination file
  5. After setting everything up, hit the “Start multiplexing” button at the bottom right. You’ll see the progress as it goes.Merge SRT subtitles with MKV using MKVToolNix
  6. When it’s done, you’ll get a notification. Now, you can watch your MKV video with the subtitles already in it.MKV SRT subtitles merge

And there you go, you’ve merged an SRT subtitle file with an MKV video file using MKVToolNix. This lets you enjoy or share your movies and shows with the right subtitles, all in one single file.

Related resource: How to move subtitles to the top or bottom in VLC Player

Wrapping things up

MKVToolNix is a brilliant tool with lots of features. Beyond merging subtitles, you can check out MKV files, pull out specific tracks, or tweak the file’s details. The more you play around with it, the more you can do with your videos. While we focused on adding subtitles here, there’s a whole lot more MKVToolNix can do.

Nyau Wai Hoe
Nyau Wai Hoe is the Founder and Chief Editor of With a degree in software engineering and over 12 years of experience in the tech support industry, Nyau has established himself as an expert in the field, with a primary focus on the Microsoft Windows operating system. As a tech enthusiast, he loves exploring new technologies and leveraging them to solve real-life problems.

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