SVG (Scalable Vector Graphics) is the gold standard for web and app icons today.
- Why SVG? It scales infinitely without pixelating, has a tiny file size, and can be colored/styled using CSS code.
- When to use PNG? Use PNGs only as a fallback for very old browsers or if the icon has complex, photorealistic shading (which is rare for UI icons).
| Feature | SVG (Scalable Vector Graphics) | PNG (Portable Network Graphics) |
| Type | Vector (XML-based code describing lines/shapes) | Raster (Grid of pixels) |
| Scalability | Infinite. Can be scaled up or down to any size without losing quality or becoming pixelated. | Limited. Loses quality and becomes pixelated (blurry) when scaled up beyond its original resolution. |
| File Size | Generally Small for simple shapes (icons, logos, flat illustrations). Size increases with the number of paths/vectors. | Medium to Large. Size increases with image dimensions and color complexity. Good compression, but heavier than SVG for simple graphics. |
| Editability | High. Can be manipulated via CSS (color, size, stroke) and JavaScript. Properties are accessible in the DOM. | None. Once exported, you cannot change individual colors or shapes via code. You must edit the original source file (e.g., in Photoshop). |
| Resolution | Resolution-Independent. Looks sharp on any screen density (Retina, 4K, etc.). | Resolution-Dependent. You often need multiple versions (@1x, @2x, @3x) to look sharp on high-density screens. |
| Colors | Best for flat colors and gradients. Not suitable for photorealistic details. | Supports millions of colors. Excellent for complex images and photos. |
| Transparency | Yes. Supports transparency. | Yes. Supports high-quality transparency (alpha channels). |
| Animation | Advanced. Can be animated via CSS or SMIL (position, morphing, color changes). | No. PNG does not support animation (APNG exists but is rarely used). Standard use requires a GIF or video for motion. |
| Accessibility | High. Text inside SVG is searchable/selectable. Can contain metadata (<title>, <desc>) for screen readers. | Low. Screen readers only see the file as an image. Requires alt text attributes to be accessible. |
| Best Use Case | Icons, logos, geometric illustrations, graphs, charts, responsive animations. | Photographs, complex illustrations with heavy shading/texture, screenshots. |
