Add subtitle to MKV

Add subtitles to MKV files and make your videos easier to watch by anyone at any time.

Add subtitle to MKV online

Making a video more accessible for people with disabilities or for anyone that can’t watch with sound on is a must these days. Videos are being watched in all sorts of environments and making them easier to see will ensure you get as many views and engagement as possible.

With our video tool you can add subtitles to MKV videos directly from your browser. We make this task super fast and help you avoid complicated video editing software that requires a powerful computer to run. You don’t even have to download or install any software.

Add subtitle to MKV

Add SRT to MKV  

Among other files Flixier supports one of the most popular subtitle file types available, you can add SRT subtitles to MKV videos without any conversions or other complex processes. Simply add your video and subtitle on top of eachother in Flixier and you’re done.

Merge Subtitles with MKV online

One of the biggest advantages of Flixier is that you can use it to merge subtitles with MKV online. No more software downloads and installs, this means that your computer will run clean without any useless software that will take up resources. Just fire up your browser and head over to Flixier whenever you need to add subtitles to a video.

Automatically add subtitles to MKV

Another way to dramatically reduce the time needed to add subtitles to a video is our auto subtitle generation feature. Simply add a MKV file to the Flixier timeline and click the Generate auto subtitle button. The video will be processed super fast and the subtitle will be added to it.

Customize subtitles

Making subtitles stand out and easy to read is a must. To help you make this happen we let you change the subtitle font, size, color and to even add a background. You can also change the subtitle size and position. These changes should be subtle though, usually subtitles don’t go overboard with customization to not interfere with the video itself.

How to add subtitle to MKV

How to add subtitle to MKV
Add files to Flixier

The easiest way to get started is by clicking the Choose Video button above, you can select videos and subtitle files from your computer or use our direct integrations with cloud storage services to import videos in seconds.

Add subtitle to MKV

Now drag and drop the MKV video on the timeline at the bottom of the screen and the SRT subtitle file on a track on top of it. Make sure that the files are aligned to the left to avoid any synchronization issues.

At this step you can also change the subtitle font, color size or add a background color. All this is optional and you can skip straight to the last step.

Save the video

When happy with the result simply press the Export button at the top right of the screen and then the Export and Download button. That’s it, you're done. The video will be processed by our super fast cloud servers and it will download automatically to your computer when ready.

Why use Flixier to add subtitles to MKV

Adjust subtitles

With Flixier you can also adjust subtitle timings and make changes to the text. This feature is handy in case you spot any mistakes in your subtitles or if you need to add other details. Changing timings is also helpful when the subtitle is offset and doesn’t fit properly with the video.

Built-in MKV support

Our tool comes with built-in MKV support which means that you don’t need to worry about file conversions or other processes. Simply import your MKV file to Flixier and we will take care of everything.

Save videos as MP4

After you add subtitles to your MKV file you can save it as an MP4 video. This video file type is super compatible across all platforms and devices making it easy to play anywhere without having to install any video player software.

Add text to video

Sometimes a subtitle is not necessarily needed but some text to explain a topic is still very useful. With Flixier you can add text to video with just a few clicks, express your ideas with simple text, animated text and even motion titles and calls to action.

Merge SRT or any subtitle with MKV

We built Flixier to be compatible with a large number of file types meaning that you can merge SRT or any subtitle file with MKVs. You can add .VTT, .SUB, .STL or even .TXT subtitles to your MKV video just by dragging and dropping them in Flixier and on the timeline.


I’ve been looking for a solution like Flixier for years. Now that my virtual team and I can edit projects together on the cloud with Flixier, it tripled my company’s video output! Super easy to use and unbelievably quick exports.

Steve Mastroianni -

My main criteria for an editor was that the interface is familiar and most importantly that the renders were in the cloud and super fast. Flixier more than delivered in both. I've now been using it daily to edit Facebook videos for my 1M follower page.

Evgeni Kogan

I'm so relieved I found Flixier. I have a YouTube channel with over 700k subscribers and Flixier allows me to collaborate seamlessly with my team, they can work from any device at any time plus, renders are cloud powered and super super fast on any computer.

Anja Winter, Owner, LearnGermanWithAnja

Frequently asked questions.

Frequently Asked Questions

If you have any further questions, Get in touch with our friendly team
If you have any further questions, Get in touch with our friendly team

Can an MKV file contain subtitles?

Can an MKV file contain subtitles?

Yes, an MKV file can contain subtitles. MKV is a flexible video container format that allows users to embed subtitles directly into the video file, making it convenient for viewers to watch content with subtitles without needing a separate subtitle file. Users can also add an SRT file to an MKV video, which contains the subtitle information, allowing for greater customization and flexibility in creating subtitles. With Flixier, you can easily embed subtitles in MKV files or add SRT files to your videos, making it simple to create professional-quality videos that stand out from the crowd.

Do SRT files work with MKV?

Do SRT files work with MKV?

Yes, SRT files work with MKV files. SRT (SubRip Subtitle) files are a popular subtitle format that contain the subtitle information and can be easily added to an MKV video file. By adding SRT files to MKV videos, users can customize their subtitles with different fonts, sizes, and styles, making it easy to create captions that fit the video's tone and style.

Flixier makes it simple to add subtitles to an MKV file, whether you want to embed the subtitles directly into the video or add them as a separate SRT file. With Flixier's user-friendly interface and intuitive tools, you can quickly and easily add sub to MKV files, making it easy to create professional-quality videos that captivate your audience.

What subtitle formats does MKV support?

What subtitle formats does MKV support?

A variety of subtitle formats are supported by the adaptable video container format MKV (Matroska Video). MKV can play several of the most popular subtitle formats, including:

  • SRT (SubRip Subtitle) is a format for plain text files that holds the subtitle data.
  • SSA/ASS (SubStation Alpha) is a more advanced subtitle format that supports text formatting, styles, and effects.
  • SUB (MicroDVD) is a text-based subtitle format that supports basic subtitle information, such as start and end times.
  • IDX (DVD Subtitle) is a standard subtitle format for DVDs that stores the subtitle data in a separate file.

What subtitle formats does MKV support?

What subtitle formats does MKV support?

Unlock the Potential of Your PC

Easily create, collaborate and publish videos on any computer to grow your audience and increase your revenues!