Automatically Synchronize Subtitles With Video Using SubSync

A handy utility for automatically synchronizing subtitles with video.
Warp Terminal

Let me share a scenario. You are trying to watch a movie or video and you need subtitles. You download the subtitle only to find that the subtitle is not properly synchronized. There are no other good subtitles available. What to do now?

You can synchronize subtitles in VLC by pressing G or H keys. It adds a delay to the subtitles. This could work if the subtitle is out of synch by the same time interval throughout the video. But if that’s not the case, SubSync could be of great help here.

SubSync: Subtitle Speech Synchronizer

SubSync is a nifty open source utility available for Linux, macOS and Windows.

It synchronizes the subtitles by listening to the audio track, and that’s how it works the magic. It will work even if the audio track and the subtitles are in different languages. If necessary, it could also be translated but I did not test this feature.

I made a simple test by using a subtitle which was not in synch with the video I was playing. To my surprise, it worked pretty smooth and I got perfectly synched subtitles.

Using SubSync is simple. You start the application and it asks to add the subtitle file and the video file.

subsync interface
User interface for SubSync

You’ll have to specif the language of the subtitle and the video on the interface. It may download additional assets based on the language in use.

subsync subtitle synchronize
SubSync may download additional packages for language support

Please keep in mind that it takes some time to synchronize the subtitles, depending on the length of the video and subtitle. You may grab your cup of tea/coffee or beer while you wait for the process to complete.

You can see the synchronization status in progress and even save it before it gets completed.

subsync subtitle synchronize 1
SubSync synchronization in progress

Once the synchronization completes, you hit the save button and either save the changes to the original file or save it as a new subtitle file.

subsync subtitle synchronization completed
Synchronization completed

I cannot say that it will work in all the cases but it worked for the sample test I ran.

Installing SubSync

SubSync is a cross-platform application and you can get the installer files for Windows and macOS from its download page.

For Linux users, SubSync is available as a Snap package. If your distribution has Snap support enabled, use the following command to install SubSync:

sudo snap install subsync

Please keep in mind that it will take some time to download SubSync snap package. So have a good internet connection or plenty of patience.

In the end

Personally, I am addicted to subtitles. Even if I am watching movies in English on Netflix, I keep the subtitles on. It helps understand each dialogue clearly, specially if there is a strong accent. Without subtitles, I could never understand a word from Mickey O’Neil (played by Brad Pitt) in the movie Snatch. Dags!!

Using SubSync is a lot easier than using Subtitle Editor for synchronizing subtitles. After Penguin Subtitle Player, this is another great tool for someone like me who searches the entire internet for rare or recommended (mystery) movies from different countries.

App Highlight: Penguin Subtitle Player for Adding Subtitles to Online Videos
I must confess. I am addicted to subtitles. It helps me understand the dialogues completely, specially if some dialogues are in a different accent or in a different language. This has led to a habit of watching online videos with subtitles. While streaming services like Netflix and Amazon…

If you are a ‘subtitle user’, I have a feeling you would like this tool. If you do use it, please share your experience with it in the comment section.

About the author
Abhishek Prakash

Abhishek Prakash

Created It's FOSS 11 years ago to share my Linux adventures. Have a Master's degree in Engineering and years of IT industry experience. Huge fan of Agatha Christie detective mysteries 🕵️‍♂️

Become a Better Linux User

With the FOSS Weekly Newsletter, you learn useful Linux tips, discover applications, explore new distros and stay updated with the latest from Linux world


Great! You’ve successfully signed up.

Welcome back! You've successfully signed in.

You've successfully subscribed to It's FOSS.

Success! Check your email for magic link to sign-in.

Success! Your billing info has been updated.

Your billing was not updated.