✳ CAPTIONS · SUBSTACK
SRT captions for Substack
Caption QA + Substack compatibility. Drop a SRT file to validate it against Substack's caption rules. Stays on your device.
Substack · may accept SRT (verify with the platform)
Sidecar .srt file with timestamps; players that support it will overlay these captions.
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
After validating, create all platform versions in the Creator: /tools/pack
Automate this in Koldflux