SpiikStart here
These tools run entirely in your browser, with no sign-up. Your files stay on your device.
SRT and VTT are the two most common subtitle formats. An SRT file is a plain list of numbered cues that most video editors and players accept. VTT (WebVTT) is the format web video players use, with a header line and a slightly different way of writing timestamps. These tools switch a file between the two without changing its timing, or strip subtitles down to clean text you can read, search or paste into a document. They run on your device, so nothing is uploaded and there's no sign-up. If you need subtitles for a recording in the first place, Spiik transcribes audio and video in more than 100 languages and exports SRT and VTT directly.