Most people now watch video with the sound off.
They are scrolling on their phone, sitting in an open-plan office, commuting, or multitasking. If your video relies on audio alone, there is a good chance the message is being missed.
This is why subtitles and captions have moved from being a nice-to-have to a practical requirement, particularly on social media and web videos.
In this post, we’ll explain why subtitles matter, where they make the biggest difference, and the most reliable ways to add them without compromising quality.
What are video subtitles and captions?
Subtitles, sometimes referred to as captions, are the on-screen text that displays spoken dialogue and key audio information.
They allow viewers to understand a video even when sound is unavailable or inconvenient. This is common on mobile devices and social platforms, where videos often autoplay silently.
Subtitles also improve accessibility for viewers who are deaf or hard of hearing, which is increasingly important for organisations with public-facing or regulated content.
Why subtitles matter on social media
On most social platforms, videos autoplay without sound by default.
If the message is not immediately understandable visually or through subtitles, viewers will scroll past. Subtitles help stop the scroll by making the content legible within the first few seconds.
In our experience, videos with clear, well-timed subtitles consistently achieve higher watch time and stronger engagement than those without.
The two main ways to add subtitles
There are two common approaches to adding subtitles to video. Each has advantages depending on how and where the video will be used.
Sidecar caption files
A sidecar caption file is a separate text file that is uploaded alongside the video. The most common format is an .srt file.
Platforms such as YouTube, Facebook, and Vimeo support these files and handle how subtitles are displayed based on screen size and device.
This approach generally provides the best viewing experience. Subtitles scale appropriately on mobile and desktop, and viewers can turn them on or off as needed.
Sidecar files also make it possible to offer multiple language options. For example, viewers can choose between English or Mandarin subtitles if both files are provided.
An additional benefit is discoverability. Search engines can read subtitle files, which can help videos appear in relevant search results.
Burnt-in subtitles
Burnt-in subtitles are added directly into the video image during editing. They cannot be turned off.
This approach is often used for platforms that do not support caption files, such as Instagram, or in environments where playback conditions are unpredictable, like conferences or live presentations.
Burnt-in subtitles also allow greater visual control. Fonts, sizes, and placement can be designed to align with brand guidelines.
The main limitation is flexibility. Text size does not adapt to screen size, and viewers cannot disable subtitles if they prefer to watch without them.
Creating a simple .srt caption file
SRT files can be created without specialist software using basic text editors such as Notepad (Windows) or TextEdit (Mac).
Each subtitle entry includes a number, a timecode range, and the text to be displayed. Formatting must be exact.
0 00:00:01.000 --> 00:00:05.000 Welcome to my video about subtitles 1 00:00:05.000 --> 00:00:10.000 Thank you for watching
Once created, save the file with an .srt extension and upload it alongside your video on the chosen platform.
Uploading subtitles to common platforms
- Upload your video.
- Select “Edit video”.
- Choose your subtitle file and save.
YouTube
- Open YouTube Studio and select your video.
- Go to “Subtitles”.
- Upload your subtitle file.
- Publish.
The process is similar across most platforms. Instagram remains the main exception, where subtitles must be burnt into the video.
Choosing the right approach
If you control the platform and want flexibility, sidecar files are usually the best option.
If you need guaranteed visibility across all environments, burnt-in subtitles are more reliable.
In many cases, we recommend creating both versions so videos can be used across multiple channels without compromise.
Need help adding subtitles to your videos?
Subtitles are one of the simplest ways to improve clarity, accessibility, and performance, but only when they are done properly.
If you are creating videos for social media, websites, or internal communications and want subtitles that support the message rather than distract from it, we can help.
Get in touch and we can talk through the best approach for your content.
Video Subtitles and Captions – Frequently Asked Questions
Why are subtitles important for social media videos?
Most social media videos autoplay without sound. Subtitles allow viewers to understand the message immediately, which improves watch time, engagement, and message retention.
What is the difference between subtitles and captions?
Subtitles typically display spoken dialogue, while captions may also include descriptions of sounds such as music or background noise. In practice, the terms are often used interchangeably for online video.
What is an SRT file?
An SRT file is a plain text subtitle file that includes timecodes and dialogue. It is uploaded alongside a video and allows platforms like YouTube, Facebook, and Vimeo to display subtitles dynamically.
Are sidecar subtitle files better than burnt-in subtitles?
Sidecar files are usually better when the platform supports them because subtitles scale correctly across devices and can be turned on or off. Burnt-in subtitles are more reliable when platform support is limited or playback conditions are unpredictable.
Do subtitles help with video SEO?
Yes. Search engines can read subtitle files, which can help videos appear in relevant search results and improve discoverability, particularly on platforms like YouTube.
Which platforms support subtitle files?
Platforms such as YouTube, Facebook, LinkedIn, and Vimeo support subtitle files. Instagram does not support sidecar subtitle files, so subtitles must be burnt into the video.
Should every business video include subtitles?
In most cases, yes. Subtitles improve accessibility, clarity, and performance, especially for social media, internal communications, and website videos viewed on mobile devices.
Ryan Spanger is the founder and managing director of Dream Engine, a Melbourne-based video production company established in 2002. With more than two decades of experience, Ryan has helped leading Australian businesses, government departments, and non-profits communicate their message with clarity and impact through video. He’s known for his strategic approach, reliable process, and commitment to producing videos that deliver measurable results.
