Subtitle Toolbox

Free subtitle tools that run in your browser: shift, convert, time and check SRT and VTT files.

Subtitle Reading Speed & Line Length Checker

Check SRT or VTT subtitles for reading speed (CPS), long lines, short durations and overlaps, then fix them automatically. Free, in your browser.

Subtitle Shifter & SRT to VTT Converter

Fix out-of-sync subtitles: shift SRT or VTT times, sync to the first line, fix frame-rate drift and convert between SRT and VTT. Free, in your browser.

TXT to SRT Converter: Text or Transcript to Subtitles

Turn a script or transcript into a timed SRT or VTT subtitle file. Times by reading speed, by video length, or from timestamps in the text.