How an Online Stamp Maker Works: A Deep Dive into Browser-Based Design Tools

Building a browser-based design tool sounds straightforward — until you realize users expect Photoshop-level control, instant previews, and multi-format exports, all without installing anything. Having spent time building an online stamp maker, I want to walk through the real technical challenges behind this kind of product and how we solved them. - The Core Rendering Decision: Canvas vs SVG The first architectural decision in any browser-based design tool is the rendering engine. You have two primary options: HTML5 Canvas and SVG DOM. Each has a fundamentally different model. Canvas is a pixel-based imperative API. You draw to it with commands: const ctx = canvas.getContext('2d'); ctx.beginPath(); ctx.arc(200, 200, 180, 0, Math.PI * 2); ctx.strokeStyle = '#1a1a1a'; ctx.lineWidth = 4; ctx.stroke(); The canvas doesn't know about the circle after drawing it. It's pixels on a bitmap. This makes it fast for rendering complex scenes, but terrible for interaction — you have to implement your