Open vs. Closed Captions: What's the Difference and Which Should You Use?
Burned-in captions or a separate SRT file? A plain-English comparison of open and closed captions, with advice for social media, YouTube and websites.
Vixo team · · 3 min read
When you add captions to a video, you have two options. You can make them part of the picture (open captions) or deliver them as a separate track that viewers can turn on and off (closed captions). Both have their place. Here's how to choose.
What are open captions?
Open captions, also called burned-in or hard-coded captions, are drawn directly onto the video frames. Once the video is exported, the text is part of the image, just like anything else you filmed.
Advantages
- Always visible. Viewers don't need to turn anything on, which matters on social feeds where videos autoplay on mute.
- Look the same everywhere. Your font, colors, animation and position look identical on every app, browser and device.
- Fully stylable. You can use bold fonts, word highlights and animations that caption files can't do.
- Work on platforms with no caption support, such as some messaging apps and ad networks.
Disadvantages
- Can't be turned off. A viewer who doesn't want them can't hide them.
- Hard to edit afterwards. Fixing a typo means exporting the video again.
- One language per video. For multiple languages you'd need multiple exports.
- Not readable by search engines or screen readers the way a text file is.
What are closed captions?
Closed captions are stored as text with timestamps, in a separate file or a track inside the video container. Common formats include SRT and WebVTT (VTT). The video player draws the text at playback time, and viewers can usually switch them on or off with the "CC" button.
Advantages
- Viewer control. People can turn them on, off, or (on some players) change the size and color.
- Multiple languages. Upload one file per language and let viewers choose.
- Easy to fix. Edit the text file and re-upload. No need to re-export the video.
- Machine readable. Platforms can index the text, and assistive technology can work with it.
Disadvantages
- Off by default on many platforms, so muted viewers may never see them.
- Limited styling. The player decides how they look, usually plain text on a dark background.
- Not supported everywhere, especially on social apps where you can't upload a caption file.
Which one should you use?
| Situation | Best choice |
|---|---|
| TikTok, Reels, Shorts, Stories | Open (burned-in) |
| Video ads on social media | Open (burned-in) |
| Long YouTube videos | Closed (upload SRT), optionally plus open captions for key moments |
| Courses, webinars, training | Closed, so learners can choose |
| Videos on your own website | Closed (WebVTT), for accessibility and flexibility |
| Multiple languages | Closed, one file per language |
For short social video, open captions are almost always the right choice. You can't rely on viewers turning captions on, and the styling options (big bold words, highlights, animation) are part of what makes short-form content engaging.
For long-form and educational content, closed captions are usually better, because viewers want control and you may need several languages.
Can you do both?
Yes, and many creators do. A common approach on YouTube is to burn in stylish captions for the hook or the most important lines, and also upload a full SRT file for viewers who prefer the player's captions. Just don't show two full sets at the same time, because overlapping subtitles are hard to read.
How Vixo handles it
Vixo creates open captions. The text is burned into the MP4 you download, so it looks exactly the way you designed it in the editor and shows up on every platform. That makes it ideal for TikTok, Instagram, YouTube Shorts, Facebook and LinkedIn videos.