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Dynamic Captions

Brand-aware animated captions for viral videos

Dynamic Captions burns brand-consistent animated captions into your videos — the same viral style seen on high-performing Instagram Reels and TikToks.

What you can do: Use manage_brand to create a brand profile once (fonts, colours, animation preferences) and reuse it across every video. Use apply_captions to transcribe a video, let AI pick keywords and animation style, then render word-by-word animated captions directly into the video.

Who it's for: Content creators, social media managers, and brands who want professional dynamic captions without manual editing.

How it works:

  1. Create a brand profile with your fonts and colours using manage_brand
  2. Run apply_captions on any video — transcription, AI keyword analysis, and rendering happen automatically
  3. Download the captioned video ready to post

Supported animation styles: Word-pop (one word at a time), karaoke (highlight as spoken), sentence-burst (full sentence with keyword emphasis), bold-single (two words, large and centred). AI picks the best style for your content unless you specify one in your brand profile.

Permissions and setup

  • fal.ai API Key (secret): Optional: use your own fal.ai key instead of the platform default
  • Prodia API Token (secret): Optional: use your own Prodia token instead of the platform default
  • Higgsfield API Key (secret): Optional: use your own Higgsfield key instead of the platform default
  • Photalabs API Key (secret): Optional: use your own Photalabs key instead of the platform default
  • Google AI API Key (secret): Optional: use your own Google AI key instead of the platform default
  • OpenRouter API Key (secret): Optional: use your own OpenRouter key instead of the platform default
  • ElevenLabs API Key (secret): Optional: use your own ElevenLabs key instead of the platform default
Manage Brand ProfilePricing: free

Create, update, retrieve, or delete a brand profile for caption styling

Apply CaptionsPricing: paid

Transcribe a video and render dynamic branded captions into it

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v0.022026-08-20
  • Caption writing now uses Claude Sonnet 5.
v0.012026-04-29
  • Initial release: brand-aware dynamic captions with AI keyword emphasis and animation style selection

Connect ToolRouter to use Dynamic Captions in Claude, ChatGPT, Copilot, and more — no code required.

Connect ToolRouter

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