✳ CAPTIONS · SPOTIFY CANVAS
ASS / SSA captions for Spotify Canvas
Caption QA + Spotify Canvas compatibility. Drop a ASS / SSA file to validate it against Spotify Canvas's caption rules. Stays on your device.
Spotify Canvas · does not accept ASS / SSA directly
Advanced SubStation Alpha; richer styling, supported by some desktop players.
Source: https://artists.spotify.com/canvas · 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
After validating, create all platform versions in the Creator: /tools/pack
Automate this in Koldflux