Choosing between SVG and PNG is one of the most common decisions in web design. Both formats have distinct strengths, and using the wrong one can hurt your site's performance and visual quality.
Vector vs Raster: The Fundamental Difference
SVG (Scalable Vector Graphics) stores images as mathematical descriptions of shapes, paths, and colors. A circle is described as "circle at position X,Y with radius R" rather than as individual pixels. This means SVGs can scale to any size without losing quality.
PNG (Portable Network Graphics) stores images as a grid of colored pixels (raster). Each pixel has a fixed color value. Scaling up a PNG makes it blurry because you're stretching fixed-resolution data.
When to Use SVG
- Logos and icons: Scale perfectly at any resolution, from favicon to billboard
- Illustrations with flat colors: Simple graphics, diagrams, and charts
- Interactive graphics: SVG elements can be targeted with CSS and JavaScript
- Animations: CSS and SMIL animations work directly on SVG elements
- Text-heavy graphics: Text in SVG remains selectable and searchable
When to Use PNG
- Photographs: Complex images with millions of colors and gradients
- Screenshots: Pixel-perfect reproduction of screen content
- Complex textures: Images with noise, gradients, or photographic detail
- Transparency with soft edges: PNG supports full alpha transparency
Performance Comparison
For simple graphics, SVGs are dramatically smaller. A logo that is 50 KB as PNG might be only 2 KB as SVG. However, for complex illustrations with thousands of paths, SVG files can become very large and slow to render. The breakpoint is typically around 1,000-2,000 path segments — beyond that, PNG is often more performant.
Converting Between Formats
Use our PNG to SVG Converter to trace raster images into vector paths, or our SVG to PNG Converter to rasterize vectors at any resolution. For best results when tracing, start with high-contrast images with clean edges.