Render HTML (and optional CSS) into a PNG/JPEG/WebP image using codetoimage.app. Instead of raw HTML you can pass template_id (a template saved in the dashboard) plus variables to fill its {{placeholders}}, and preset for named platform sizes (og, instagram-story, ...). Returns the image inline so the conversation can display it directly. Use this when you need to see or hand back a finished image (cards, OG previews, charts, badges). If the caller needs a URL to embed elsewhere (Instagram Graph API, OpenGraph meta, Slack unfurl), use render_html_to_url instead.

Render HTML (and optional CSS) to an image and return a temporary hosted URL (instead of inline bytes). Supports the same template_id + variables + preset inputs as render_html_to_image. Use this when the caller needs to reference the image elsewhere – Instagram Graph API, OpenGraph meta tags, Slack unfurls, embedding in docs/posts. URL is valid for 24 hours.