There isn’t a single “best” subtitle format — there’s a best format for whatever you’re about to do with the file. Here’s how to choose without guessing.
SRT: the universal default
SRT (SubRip Subtitle) is a plain-text format with numbered blocks, each carrying a start time, an end time, and the caption text. It’s old enough and simple enough that almost every video editor, media player, and course platform can read it without conversion. If you’re not sure which format you’ll need later, SRT is the safest bet — it’s easy to convert into something else, but not every format is easy to convert into SRT.
VTT: built for the browser
WebVTT shares SRT’s basic idea — timed text cues — but it’s the format the HTML5 <track> element actually expects. If the captions are going straight into a website’s own video player, VTT saves you a conversion step. It also supports a bit more metadata than SRT (styling and positioning hints), though most subtitle downloads won’t use those extras.
TXT: when timing doesn’t matter
TXT strips out the cue numbers and timestamps entirely, leaving just the spoken words. That’s exactly what you want for reading a transcript top to bottom, searching for a specific phrase, feeding the text into notes, or summarizing a talk — none of which benefit from knowing that a sentence started at 00:04:12.
A quick decision table
- Editing a video or uploading to a course platform? Use SRT.
- Publishing captions on your own website’s video player? Use VTT.
- Studying, researching, or just reading? Use TXT.
What stays the same no matter the format
Auto-generated captions can contain mistakes regardless of which file type you export — misheard names, missing punctuation, and the occasional garbled technical term. Review the text before you rely on it for anything published, translated, or graded. And whichever format you pick, copyright rules don’t change: only use captions for content you own, have permission to use, or where the law and the platform’s terms allow it.