✳ VALIDATOR · FACEBOOK FEED
Subtitle validator for Facebook Feed
Pick a subtitle file. Koldflux reads metadata locally and reports PASS / WARNING / FAIL / UNKNOWN against Facebook Feed. Nothing uploaded.
Extension and MIME type are labels, not proof of the container. Dimensions and duration come from this browser's media reader. Files and measurements are not sent anywhere.
What this checks
- Container compatibility (does Facebook Feed accept this extension)
- File size vs. Facebook Feed max
- Aspect ratio vs. Facebook Feed recommended
- Caption character and duration limits
Convert a failing file in one click: /tools/convert
Automate this in Koldflux