SRT

SRT (SubRip Text) is a widely used plain-text subtitle file format originally created by the SubRip software for extracting subtitles from DVDs. An SRT file contains sequentially numbered subtitle entries, each with a time range (start and end timestamps in hours:minutes:seconds,milliseconds format) and the subtitle text to display during that period. SRT became the de facto standard for distributing subtitles online due to its simplicity — it can be created and edited with any text editor. The format was influential in the development of WebVTT, which extended SRT with styling, positioning, and metadata capabilities. While SRT lacks the formatting features of more advanced formats like TTML or WebVTT (it supports only basic HTML tags like bold and italic), its simplicity and universal support across video players make it remain widely used for subtitle exchange and as an input format for captioning workflows.