Captions in seconds, not hours.
Caption Toolkit: automating subtitles in After Effects.
Context
Creating captions inside After Effects is usually slow and manual; designers have to manually transcribe audio, break lines, time each caption, and build text layers one by one.
Tools like CapCut and Premiere Pro automate this, but After Effects doesn't offer anything similar.
Caption Toolkit was built to bring that level of automation directly into After Effects, producing clean, editable captions in seconds instead of hours.
Caption Toolkit incorporated into an existing Vidsy tool.
Role
- Problem identification
- Pipeline architecture
- UX Design
- Full-stack development (Bolt CEP, React, TypeScript, ExtendScript)
Caption Toolkit utilises OpenAI Whisper & Assembly AI to generate captions.
Solution
- Exports timeline audio (all tracks or selected) directly from After Effects for transcription.
- Sends audio to OpenAI Whisper or AssemblyAI depending on the transcription needs.
- Parses the returned SRT and generates fully editable text layers with accurate in/out points across the timeline.
- Delivers the same flexibility as manual captions without any of the manual labour.
Ae timeline generated by the caption toolkit in seconds.
Impact
What used to take hours now completes in seconds.
Caption Toolkit removed one of the biggest bottlenecks for editors and designers working on fast-turnaround content, and brought modern automated captioning into After Effects without requiring anyone to leave the app.