Choose captions
I added a player button and in-page sidebar for caption tracks and local subtitle files.
Chrome extension
CaptionFlow
Caption discovery, local subtitle files and in-player controls.
JavaScriptChrome Extensions Manifest V3
RoleDeveloper
PlatformsChrome extension
TypeChrome extension
The overview
I built CaptionFlow as a Chrome extension that adds subtitle controls inside YouTube and Crunchyroll players. I also added local subtitle loading for HTML video and controls for adjusting caption appearance and timing.
How it was made
- 01
Find tracks
I added discovery for manual and auto-generated YouTube captions and Crunchyroll subtitle tracks.
- 02
Load subtitles
I added local SRT, VTT, ASS and SSA support that processes files in the browser without uploading them.
- 03
Tune display
I built an in-video toolbar for visibility, size, timing, position, style, background and color.
- 04
Export captions
I added track extraction as SRT or VTT files.
Key features
Find tracks
I connected manual and auto-generated YouTube captions with Crunchyroll subtitle tracks.
Use local files
I added local SRT, VTT, ASS and SSA subtitle loading.
Adjust captions
I built an in-video toolbar for visibility, size, timing, position, style, background and color.
Export tracks
I added extraction of selected tracks as SRT or VTT files.
Tools & stack
JavaScriptChrome Extensions Manifest V3