SVG vs PNG: Which Format Should You Use?
A detailed comparison of SVG and PNG formats — when to use each, file size differences, browser support and use-case recommendations.
SVG and PNG are both widely used image formats, but they serve very different purposes. Understanding the differences helps you choose the right format for every situation.
SVG: The Vector Approach
SVG (Scalable Vector Graphics) stores images as mathematical descriptions of shapes and paths. This means the file is essentially code — specifically XML — and the image is rendered by the browser or application at display time. The result is perfectly sharp output at any resolution, from screen to print.
PNG: The Raster Approach
PNG (Portable Network Graphics) stores images as a grid of pixels. It supports transparency (unlike JPG) and uses lossless compression, making it ideal for screenshots, illustrations, and graphics with flat colours. However, PNG images have a fixed resolution and will appear pixelated if scaled beyond their original size.
When to Use SVG
Use SVG for logos, icons, illustrations, charts, diagrams, and any graphic element that appears at multiple sizes. SVG is also a natural choice for animated graphics and interactive elements. Web applications benefit greatly from SVG because the files are small and the rendering is crisp on high-density (Retina) displays.
When to Use PNG
Use PNG for screenshots, complex images with many colours, photographs that need transparency, and any image that already exists at a specific resolution. PNG is also safer when compatibility with older software is a concern, as SVG support can vary in older applications.
File Size Comparison
For simple graphics (logos, icons, illustrations), SVG files are typically much smaller than PNG equivalents — sometimes by an order of magnitude. For complex, photographic images, PNG will usually be smaller. The break-even point depends on the complexity of the vector paths required to represent the image.
SVG and PNG each have their strengths. For scalable, styleable graphics, SVG is almost always the better choice. For complex photographs and compatibility-sensitive contexts, PNG remains valuable. When in doubt, maintain both formats.
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