When any business wishes to launch its video in the international market, adding subtitles is the most common practice. Adding these subtitles makes the video accessible for a larger audience. Although this process looks simple, the actual complexity lies in choosing the correct format.
The subtitle file format is decided based on the platform it will be posted on and the basic requirements of the clients or broadcasters. A video that requires simple captions and will be posted on generic platforms and media players might use SRT as its subtitle file format. At the same time, a company can have the same requirements but would specifically ask for the file to be in VTT format.
If you are also working on editing and updating the subtitles of video, understanding the basic difference between common subtitle file formats, such as SRT and VTT, and how to choose for your next big project is important.
What is SRT (SubRip Subtitle)?
SRT, an abbreviation for SubRip Subtitle, is one of the simplest and most common subtitle file formats. It contains timestamps, where the text at the mentioned duration appears on the screen, making it easy to edit and update.
One of the reason that this file format is used more than other formats is because of its easy to create and edit feature. Someone who can edit the text and has basic knowledge of synchronization and video editing can easily work with SRT. And it is not only easy to use, but is also accessible on many platforms and media players. Although this particular file format does not allow any style positioning or font changes, it is widely popular for basic editing and adding text to pre-recorded and developing videos. If you are also looking for a file format that can work on fast and accurate subtitles without any additional changes or edits, SRT can be an ideal choice.
What is VTT (WebVTT)?
VTT stands for Web Video Text Tracks, commonly called WebVTT. It is a text-based subtitle and caption format designed for use with web video. It is also the format used by the HTML5 video element’s text-track feature. This format is different from the standard SRT files, and the files start with an extension of WebVTT, followed by a blank line and subtitle cues.
The operations of VTT are different from SRT, as it does not include numerical blocks, but can work with optical identifiers, metadata, and styling information. It also supports features that work well for web-based playback, which include options for positioning and alignment of the text. Along with this, VTT can also work with cues and CSS, but the appearance of text in this can be seen in the browser or video player only.
All these reasons make VTT an ideal and more advanced choice for subtitle file format, if the platform or broadcaster asks for it. If the content you are working on will be published on a website, opt for VTT over SRT for a smoother transition of content. Well-timed subtitles on your own site can also help video visibility, as explained in how subtitling services improve your video SEO.
SRT vs VTT: timestamp format differences
The easiest way to identify SRT and VTT is with the help of timestamps. In general, SRT files use timestamps to identify the text that needs to be added, edited, or changed in the video. VTT also uses the start and end time to determine the subtitle, but the way these two formats write the code is different.
Another difference between the two is that when working with SRT, it uses subtitle blocks that are numbered in sequence. VTT, on the other hand, does not really treat identifiers as mandatory options, and works with time codes without a start number. VTT also includes a header at the beginning of the file. These timed cues are also the clearest difference between transcription and subtitling, since a plain transcript is not built to display text in sync with the video.
SRT vs VTT: styling and positioning
The requirements of the project play a vital role in determining which file format to use and how. The simplest way to identify is the platform, placement of the text, and text editing required.
This means that if the project does not need any additional text styling and positioning, has minimal text edits, and can be uploaded on simple platforms such as YouTube and Vimeo, then you can easily work with SRT.
If you want the subtitle file formatting to work with more complex aspects, such as styling, positioning, control over the cue, basic text editing, and CSS-based styling, then going for SRT will not suffice. You will have to invest your time and effort in working with WebVTT for your project.
It is important to understand that no format offers complete compatibility with all platforms and positioning. If one offers comfort across multiple platforms, then the other is compatible to work with styling, positioning and formatting. Positioning matters most for SDH subtitle tracks, where sound cues and speaker labels must stay readable without covering on-screen text.
SRT vs VTT: platform and player compatibility
When working with subtitles, checking the compatibility of the displaying platform or player is the key priority. The platform or player determines what type of format can work on the video, and the placement of the text on the screen. Even if the file is valid, sometimes the platforms do not support it, making the entire work invalid. When working with VTT, the most common use is to display it on websites or video players that are supported by HTML5. And if you are working with SRT, then it can be used for platforms that support basic video uploads, workflows, and subtitle delivery.
Before delivery, test the file on the actual platform and review the subtitles from beginning to end. These tips for effective subtitling in different languages can help you structure that final review across every language version.
When to use SRT
SRT can be the perfect choice for your videos if the requirements include accuracy, readable subtitles with no extra positioning or styling needed. Accuracy here refers to the subtitle text itself, and the impact of poor subtitling shows why subtitle accuracy matters as much as the file format. It is a good format that can be used for multilingual videos. All the languages will be delivered in a different file, making the assessment easier and smoother. Before starting with SRT, it is important to check the platform and ensure that all the features support the format and that no segmentation is left behind or causes an error.
When to use VTT
VTT is the perfect choice for your videos if they are being uploaded on a website or in an HTML5 video players. Other than this, if you are looking for a file format that can help with styling, positioning, alignment, or even text editing, then opt for VTT.
Still, blindly working with VTT for all website-related requirements is not the correct choice. You should check with the particular platform, player, or website using a pilot task before working on the file completely.
Can you convert SRT to VTT (and vice versa)?
Yes, a file initially created in SRT or VTT can be converted into the other after working on the complete subtitles. This can be done with simple steps.
If you are trying to convert an SRT file into VTT, then you should add WEBVTT headers and change the timestamp separator from a comma to a full stop. All the other WebVTT rules should also be included in the subtitles. And if you are planning to convert a VTT file into SRT, then remove the WEBVTT header, and change the full stop timestamp separator to a comma.
SRT vs VTT vs TTML: the full picture
SRT is relatively simple. It stores subtitle text and timestamps in a format that is easy to create and edit. It works well for basic subtitle delivery, provided the receiving platform supports it.
VTT is designed for web video. Along with subtitle text and timings, it supports features such as cue settings and styling that can be useful in compatible browser-based players.
TTML uses a structured markup format and can carry richer styling, layout, and timing information. It is often relevant when a broadcaster, streaming service, or professional delivery specification requires a particular timed-text format. The exact TTML profile and requirements depend on the recipient, and a full subtitle format guide covers TTML alongside SCC, STL and ASS.
Conclusion
If you are stuck between SRT and VTT files and cannot choose the correct one for your videos, then this guide can help you make the correct choice. It helps establish the clear difference between the two, how to identify the two formats, and even states the advantages of the two formats in common scenarios. If you need files delivered in either format, professional subtitling services can produce and test them for your target platform.
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FAQs
VTT can be a better choice than SRT if your requirement is specifically about websites or an HTML5 video player. It can also be better to use if you wish to position, style, or align the text as per the requirements.
If you are working with web videos, then try working with VTT.
Yes, with a VTT file, you can work on text styling as well. VTT allows the liberty to style, position, and align the text as per the desire, making it easier for the editor. Checking with the platform is necessary before working on the file.
Yes, an SRT file can be easily converted to VTT while following basic steps.
YouTube is a common video-playing platform and supports both SRT and VTT.
LMS is a separate type of platform that requires special attention to subtitles. You can confirm with the particular system you are using to understand which format is better.
VTT follows its own timestamp syntax, which uses a full stop before the milliseconds. SRT uses a comma in the same position.
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