If you’ve never come across closed caption files before, let us explain what they are and why they matter.
When we deliver your final video, you’ll often receive more than just the MP4 file of the video. Tucked alongside it, you might spot a little file with a name like “video_final_captions.srt”.
It might just look like a weird text file – and it kinda is – but it’s so much more than that!
Closed captions are one of the simplest ways to make your videos more accessible, searchable and flexible across different platforms.
And you don’t need any fancy software or technical know-how to use them either!
What Is a Closed Caption File?
Closed captions are a separate text file that works in conjunction with your video by telling the video player when and where to display subtitles.
<img class=”aligncenter size-full wp-image-17104″ src=”https://boxsetmedia.co.uk/wp-content/uploads/2025/07/Closed-Captions.gif” alt=”Closed captions demonstration” width=”480″ height=”270″ />
The important thing to remember here is that they’re not permanently ‘baked into’ the video – like what you might see on social platforms – that would be what’s known as open captions.
Closed captions can be toggled on or off, depending on the viewer’s preference and the platform being used. And it’s this flexibility that’s a big part of what makes closed captions so useful.
They allow your content to be:
- More accessible – so ideal for viewers who are deaf, hard of hearing or simply like to watch with the sound off
- Better for SEO – platforms like YouTube can crawl your captions and therefore help your content appear in more search results
- Easily adaptable – closed captions can be updated any time, translated or tweaked without having to touch the original video
Common Caption File Types – And How to Edit Them
The most common and widely accepted closed caption format is the SRT file – and in most cases, that’s exactly what you’ll get.
You might also receive a VTT file (especially if you’re working on a more customised website or fancier HTML video player setup). VTT files allow for a bit more formatting – bold text, different colour and positioning etc – but major platforms like YouTube, LinkedIn, and Facebook either don’t support fancy styling, or don’t support VTT at all. That’s why we provide SRTs – they’re simple, clean and compatible with every platform you’ll need.
When you open an SRT file, it might look a bit technical – almost like a bit of code, with timestamps and text mixed in – but they’re much easier to understand than they first appear.
Here’s a quick example of what an SRT file looks like:
1
00:00:01,000 --> 00:00:03,000
Welcome to the video.
2
00:00:03,500 --> 00:00:06,000
Here’s what we’ll be covering today.Each section includes:
- A number to show the order of captions
- The start and end time of the caption (to the millisecond)
- The text that will appear on screen
The best part about these is that you can edit these files with basic software – Notepad on Windows or TextEdit on a Mac. So if you spot a typo or want to rephrase something, just open the file, make your edit, hit save – and that’s it. Try doing that with an MP4…!
How to Use Your Closed Caption Files
The good news is that most major platforms make it pretty straightforward. Whether you’re uploading your video to YouTube, LinkedIn, Facebook, or your own website, the process is usually the same:
- Upload your video
- Look for a “Subtitles” or “Captions” option
- Upload your caption file (usually the SRT)
That’s it! It really is that simple. Just make sure you assign it to the right language or region, if the platform gives you that option, and you’re good to go!
Another big benefit of closed captions is how easily they can be translated into other languages. If you’ve got an SRT file in English, all you need to do its send it to a translator and all they need to do is translate the text and leave everything else as it is.
Whether it’s French, Spanish, German – whatever your audience needs – no redubbing or re-recording the video. Just upload the additional SRT files, assign it to the right language and viewers can choose their preferred language from a simple menu in the video player.
Conclusion
Closed caption files might not look like much – just a bit of text and a few timestamps – but they give your video a huge leg up.
They make your content easier to watch, easier to find, and easier to adapt across different platforms and audiences.
Best of all, they’re simple to use, easy to edit, and flexible enough to grow with your needs – whether you’re updating captions, fixing a typo, or adding translations for a global audience.
So next time you get a caption file with your video? Don’t ignore it. Open it up, upload it, and let it do the hard work behind the scenes.
