SRT vs. VTT: which caption format should you use?
SRT and WebVTT both store timed text beside a video. SRT is the simple compatibility choice; VTT is designed for the web and supports richer cues.
The quick answer
Choose for broad compatibility
Use SRT when uploading captions to video platforms, social tools, or an editor that simply asks for a subtitle file.
Choose for web video
Use WebVTT when building an HTML5 player or when a platform specifically requests a .vtt file.
The differences that matter
| Feature | SRT | WebVTT |
|---|---|---|
| File extension | .srt | .vtt |
| Header | None | WEBVTT |
| Milliseconds | Comma | Period |
| Web positioning and styling | Limited | Built into the format |
| Typical use | Upload and editing workflows | Browser video players |
Both formats can carry the same basic caption words and timings. Converting from one to the other does not improve transcription accuracy.
How the files look
1
00:00:02,400 --> 00:00:05,100
A simple caption.WEBVTT
00:02.400 --> 00:05.100
A simple caption.Notice the VTT header and the different decimal separator. These details are small but important; changing only the filename extension does not properly convert a file.
Format is only one part of good captions
A technically valid file can still be hard to follow. Whichever format you choose, review spelling, timing, reading length, and meaningful sounds. Identify a speaker when the viewer cannot tell who is talking, and include relevant non-speech audio such as [door closes] when it affects understanding.
Our practical recommendation
Download SRT first unless your destination explicitly asks for VTT. CaptionKite lets you download both from the same result, so you can keep an SRT master and create a VTT copy for the web without transcribing twice. See the full video-to-SRT workflow.