Building a Manga Editor in the Browser: Canvas, Panels, and Speech Bubbles

Building a browser-based manga editor sounded crazy. Turns out, it was only mostly crazy. Here's how I did it for TaleForge. Why Build This? Manga creators have limited tooling options. Professional tools like Clip Studio Paint are expensive and desktop-only. Free alternatives are either too simple or too complex. I wanted something in between — a browser-based editor that handles the unique layout challenges of manga and webtoons. The Panel System Manga pages are grids of panels, but not regular grids. Panels overlap, bleed to the edge, vary wildly in size and shape. The first challenge was representing this flexibility. I went with a template-based approach. Instead of freeform panel drawing (which is powerful but overwhelming for beginners), I offer layout templates: Standard grid (2×2, 3×2, etc.) Vertical strips (for webtoons) L-shaped panels Diagonal splits Full bleed (single panel) Each template defines panel positions as percentage-based coordinates, so they scale to any page si