GlossaryFile formats
SRT
Also known as: SubRip Subtitle, .srt
SubRip Subtitle — the most common subtitle file format, plain-text with sequential entries containing timing and text.
SRT is the de facto standard subtitle format on the web. Each entry in an SRT file has a sequence number, start and end timestamps (in HH:MM:SS,mmm format), and one or more lines of text.
SRT is supported by virtually every video player, streaming platform, and caption editor. It lacks styling (no fonts, colors, or positioning) but its simplicity is what makes it universal.
Most live captioning platforms export their post-event transcripts as SRT for upload to YouTube, Vimeo, internal video CMS, or video editing pipelines.