A detailed comparison of PNG and SVG formats — file size, quality, scalability, and which to use.
PNG and SVG are two of the most widely used image formats on the web, but they work in fundamentally different ways. Choosing the wrong format leads to blurry graphics, bloated file sizes, or unnecessary complexity.
How PNG Stores Images
PNG (Portable Network Graphics) is a raster image format. It stores an image as a rectangular grid of pixels, each with a specific color value and optional transparency. PNG uses lossless compression — every pixel is preserved exactly. The downside is that scaling a PNG up beyond its original resolution causes visible blurring and pixelation.
How SVG Stores Images
SVG (Scalable Vector Graphics) is a vector image format. Instead of pixels, it stores mathematical instructions: draw a rectangle here, a curve there, fill with this color. The browser recalculates geometry every time it draws, so SVG renders perfectly at any size.
Side-by-Side Comparison
| Feature | PNG | SVG |
|---|---|---|
| Data model | Pixel grid (raster) | Mathematical shapes (vector) |
| Scalability | Blurs when enlarged | Perfectly sharp at any size |
| Transparency | Yes (alpha channel) | Yes (native) |
| File size (simple graphics) | Often larger | Often much smaller |
| Editable in code | No | Yes — XML text |
| Animatable | No | Yes — CSS and JavaScript |
| Best for | Photos, screenshots, textures | Logos, icons, illustrations, charts |
Converting Between Formats
If you have a PNG logo or icon that needs to be SVG, you can convert PNG to SVG free using Shape to Vector. The converter traces each colored region and produces clean vector paths. This works best with flat-color graphics. For photographs, stick with PNG, JPEG, or WebP.