What is WebGL? How 3D graphics run in your browser

Short answer

WebGL is a web standard maintained by the Khronos Group, the same consortium behind OpenGL and Vulkan. Version 1.0 arrived in 2011, based on OpenGL ES 2.0, and WebGL 2.0 followed in 2017, based on OpenGL ES 3.0. It gives JavaScript direct access to the GPU, so the browser can render complex scenes smoothly instead of loading the CPU.

HTML draws documents. WebGL draws scenes.

How WebGL works

• The page creates a canvas element and asks it for a WebGL drawing context
• JavaScript sends the scene's geometry, such as vertices, colours and textures, to the GPU's memory
• Small programs called shaders, written in GLSL, run on the GPU: vertex shaders position each point, fragment shaders colour each pixel
• The GPU processes huge numbers of points and pixels in parallel and paints the result into the canvas
• The loop repeats every frame, usually 60 times a second, so the scene can move and react to input

Where you meet WebGL

WebGL powers 3D product configurators, interactive maps such as Mapbox GL JS and Google Earth on the web, browser games, data visualisations with millions of points, and immersive brand pages. The interactive 3D scene on the Athryx Tech homepage is built with Spline, which renders through WebGL.

Do you need to write raw WebGL?

Rarely. Raw WebGL is low-level: a single lit cube takes dozens of lines. Most teams use a library on top of it. Three.js is the most popular general 3D library, Babylon.js is strong for games and complex scenes, PixiJS is built for fast 2D, and React Three Fiber brings Three.js into React and Next.js projects.

WebGL vs WebGPU

WebGPU is the newer browser graphics API, designed around modern GPUs and also built for general computation such as machine learning in the browser. It now ships in Chrome, Edge, Firefox and Safari, although support still varies by platform. WebGL remains the safe default because it runs almost everywhere, and many libraries now support both, falling back to WebGL when WebGPU is missing.

What to watch out for

• Performance: heavy scenes drain batteries and stutter on older phones, so test on real mid-range devices
• SEO: search engines cannot read text drawn inside a canvas, so keep headings and copy in real HTML
• Loading: 3D models and textures can weigh megabytes, so compress assets and load the scene after the main content
• Accessibility: give a text alternative and never hide key actions inside the 3D scene

When WebGL makes sense for your business

Use it when 3D helps someone decide: configuring a product, exploring a space, reading complex data. Skip it when it is only decoration. A good rule: if removing the 3D would not change what the visitor understands, it probably costs more than it earns.

Conclusion

WebGL is why browsers can show real-time 3D without plugins. It is mature, supported everywhere and easy to reach through Three.js. Used with purpose, it turns a page people read into one they explore.