Captiony is a browser-based subtitle editor — upload a video, lay captions onto a timeline, preview them over the video as you go, and export an SRT or VTT file. No desktop install, no upload to a server.
What’s in it
Timeline editing — drag and resize subtitle bars to set timing; zoom in for frame-level precision or out for the whole clip
Two timeline modes — Free (you pan around) and Centered (the playhead stays put while the timeline scrolls under it, which is easier on long sessions)
Live preview — subtitles render over the playing video, so bad timing shows up immediately
SRT & VTT round-trip — import and export both formats
Autosave + exit protection — work persists to localStorage, and the page warns before you navigate away
Keyboard-driven — Space to play/pause, ←/→ to seek, ↑/↓ to move between cues, Enter to edit, +/- to zoom the timeline
The whole editor runs client-side. That keeps it fast and means the video file never leaves the browser.
