What is an SRT file?
SRT (SubRip subtitle) is a plain-text file format for subtitles. Each block has:
- A sequence number
- A start and end timecode
- One or more lines of text
Because it is plain text, you can open it in any editor, diff it in Git, and fix typos without special tools. That portability is why SRT remains the default interchange format for many workflows.
Time format
SRT uses commas for milliseconds: HH:MM:SS,mmm. Between start and end times you will see a standard SubRip time line with an arrow.
Limits
SRT does not carry rich styling (no fonts or positions in the basic file). For advanced web styling, WebVTT is often used - compare SRT vs VTT.