Building a Privacy-First Comment Image Generator with Next.js, SVG, and Canvas

Creators often need a comment visual as part of a video edit: a compact reply sticker for a hook, or a complete vertical thread for a mockup. The obvious implementation is to render some HTML and take a screenshot. I chose a different architecture for Comment Studio, a browser-based TikTok comment generator: React owns a structured scene, SVG provides the live preview, and Canvas performs the final PNG export. This post explains why that pipeline works well, where it can fail, and how keeping th