Subtitle guides

What the different subtitle files are, why they break and how to fix them, explained without jargon. Each guide links to the free tool that does the job in your browser.

What are SDH subtitles, and how are they different from CC?
October 18, 2026
SDH subtitles add sound descriptions and speaker names for deaf viewers. See how they differ from CC and how to remove them.
Read the guide
What is an SRT file, and how do you use one?
October 18, 2026
SRT is the most common subtitle format. See how an .srt file is built, how to open and edit it, and how to fix sync issues.
Read the guide
What is a VTT file, and how do you open or convert one?
October 18, 2026
A VTT file is a WebVTT caption file for web video. See what’s inside, how to open one, and how to turn it into SRT or text.
Read the guide