// LIVE PREVIEW
▶ RUNNING
60 fps
// GENERATED CODE
Select a template and click Generate
Your boilerplate will appear here// ready-to-use html5 canvas in seconds
Generate ready-to-use HTML5 Canvas boilerplate code with resize handling, animation loop, and common utilities. Free browser-based tool, no sign-up required.
Select a template and click Generate
Your boilerplate will appear hereChoose from minimal, animation loop, mouse tracking, touch support, or offscreen canvas presets.
Set background color, canvas ID, and toggle FPS counter, context helper, and inline comments.
Click Generate to preview the animation and get the full boilerplate. Copy or download as an HTML file.
The HTML5 Canvas Boilerplate Generator produces clean, well-structured starter code for any canvas project. Each template includes proper resize handling so your canvas always fills its container at the right pixel density, plus the core scaffolding for smooth 60fps rendering.
A boilerplate is a ready-made code template that handles the repetitive setup work — creating the canvas element, setting up the 2D context, handling window resize events, and establishing a requestAnimationFrame render loop — so you can focus on writing your actual drawing logic.
Without proper resize handling, your canvas will appear blurry on high-DPI (Retina) displays, and won't adapt when the browser window is resized. The generated boilerplate scales the canvas correctly using devicePixelRatio and listens for window.resize events.
Delta time is the elapsed time between animation frames (in seconds). Using it to scale movement ensures your animation runs at the same visual speed regardless of the frame rate — so objects move 60px/s whether the device runs at 30fps or 120fps.
The Offscreen Canvas API lets you move rendering work to a Web Worker, keeping the main thread free for UI interactions. This template shows how to transfer canvas control to a worker using transferControlToOffscreen(), ideal for heavy particle systems or simulations.
Yes — the generated code is standard modern JavaScript and maps directly to TypeScript. Types like CanvasRenderingContext2D, HTMLCanvasElement, and DOMHighResTimeStamp are all available in the TypeScript DOM lib with no extra packages needed.
The generated code is framework-agnostic vanilla JS. You can adapt it for React by placing the setup logic in a useEffect hook (returning a cleanup function to cancel the animation frame), or in Vue's onMounted / onUnmounted lifecycle hooks.
The HTML5 <canvas> element is one of the most powerful APIs in the web platform, enabling pixel-level control for games, visualizations, generative art, and real-time simulations. But every canvas project starts the same way: create the element, get the context, handle resize, set up an animation loop. This boilerplate generator automates that scaffolding so you get to the interesting part faster.
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The core of any canvas animation is the requestAnimationFrame (rAF) loop. Unlike setInterval, rAF is tied to the display refresh rate, automatically pauses when the tab is hidden, and provides a high-resolution timestamp on every frame. The animation template generated by this tool uses that timestamp to compute delta time — the precise gap between the current and previous frame in seconds.
Using delta time to scale all movement and physics ensures frame-rate independence. An object set to move at 200 pixels per second will travel exactly that far whether the screen refreshes at 30Hz, 60Hz, or 144Hz. This is a foundational technique for any interactive canvas work and is included in the Animation Loop and Mouse Interaction templates by default.
A canvas element has two separate dimensions: its CSS size (what the browser layout uses) and its internal resolution (the actual pixel buffer). On a Retina or high-DPI display, devicePixelRatio is typically 2 or 3, meaning each CSS pixel maps to 2–3 physical pixels. If you don't account for this, your canvas will render at half (or a third) the resolution of the screen and appear blurry.
The generated boilerplate always sets the canvas's width and height attributes to the layout size multiplied by devicePixelRatio, then scales the context with ctx.scale(dpr, dpr). A debounced window.resize listener keeps these values updated when the viewport changes, and a ResizeObserver watches the canvas's container element for more granular size changes.
The Mouse Interaction template adds a normalized pointer position object that stays current through both mouse and touch events. Coordinates are converted to canvas-local space (accounting for the canvas's bounding rect offset) so you can use them directly in drawing logic without extra math. The Touch + Mouse template extends this to handle multi-touch with changedTouches, making it straightforward to build pinch-zoom or multi-finger canvas interactions.
Introduced in Chrome 69 and now supported in all major browsers, the Offscreen Canvas API allows you to transfer a canvas's rendering context to a Web Worker. Since workers run on a separate thread, heavy drawing operations no longer block the main thread's event loop — UI elements stay responsive even when you're rendering thousands of particles or running complex simulations.
The Offscreen template generated here shows the complete handoff: the main thread creates the canvas, calls transferControlToOffscreen(), and posts the resulting OffscreenCanvas to the worker via postMessage with a transfer list. The worker then owns the canvas and drives its own rAF loop. This pattern is ideal for particle systems, fluid simulations, and any rendering task that consistently causes frame drops.
The optional FPS counter uses a rolling average over the last 60 frame deltas to produce a stable, readable frames-per-second number. A simple counter that resets every second can fluctuate wildly; the rolling average smooths out spikes and gives a more accurate representation of rendering performance. The counter is rendered directly on the canvas in the top-left corner and can be toggled off for production builds.
The Minimal template is best for server-side generated visuals, static charts, or any use case where you draw once and don't need a continuous loop. The Animation Loop template is the right default for most projects: games, particle effects, animated charts. Choose Mouse Interaction when your canvas responds to pointer position in real time — hover effects, drawing tools, interactive simulations. Use Touch + Mouse for anything deployed on mobile. Reserve the Offscreen Canvas template for genuinely heavy rendering workloads where main-thread jank is a concern.
The generated output is a single self-contained HTML file. To integrate it into a Vite, webpack, or Parcel project, extract the <script> block into a .js module and the <style> block into a .css file. The canvas element itself goes in your HTML template or component. All APIs used — requestAnimationFrame, ResizeObserver, devicePixelRatio, OffscreenCanvas — are standard globals with no npm dependencies required.