CaptionStack
A growing collection of private, browser-based caption tools
CaptionStack is a powerful, privacy-focused suite of tools for reading, previewing, and converting caption files entirely in your browser—no server uploads required. It supports eight popular formats including SRT, VTT, SBV, LRC, TTML, JSON, CSV, and plain text, making it a versatile solution for subtitle conversion. Whether you’re working with YouTube captions, translation files, or custom subtitle formats, CaptionStack keeps your content local and secure.