✳ CAPTIONS · MASTODON
ASS / SSA captions for Mastodon
Caption QA + Mastodon compatibility. Drop a ASS / SSA file to validate it against Mastodon's caption rules. Stays on your device.
Mastodon · may accept ASS / SSA (verify with the platform)
Advanced SubStation Alpha; richer styling, supported by some desktop players.
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