✳ CAPTIONS · X (TWITTER)
WebVTT captions for X (Twitter)
Caption QA + X (Twitter) compatibility. Drop a WebVTT file to validate it against X (Twitter)'s caption rules. Stays on your device.
X (Twitter) · may accept WebVTT (verify with the platform) · post-text limit 280 characters
Sidecar .vtt file with timestamps; required by HTML5 <track>.
Source: https://help.x.com/en/using-x/media-studio-faqs · Verified 2026-09-12
What this checks
- Format auto-detection (SRT vs WebVTT) and parse errors
- Per-cue reading speed (warnings above 21 chars/sec)
- Negative timestamps and zero-duration cues
- Cue overlap and ordering
- X (Twitter) post-text character limit (280)
After validating, create all platform versions in the Creator: /tools/pack
Automate this in Koldflux