SVG vs PNG: When to Use Vector and When to Use Pixels

A logo that looks crisp on your laptop and blurry on a phone, or sharp on screen and jagged in print, is usually a PNG being asked to do an SVG’s job. The two formats store pictures in completely different ways, and that difference decides where each belongs.

In short: Use SVG for logos, icons and simple illustrations, because it scales to any size from one small file. Use PNG for screenshots and detailed pixel images, or wherever SVG is not accepted.

Pixels and vectors

A PNG is a raster image: a grid of coloured pixels. A 200 × 200 PNG contains exactly 40,000 pixels. Show it larger and the software has to invent the pixels in between, which is why it turns soft or blocky.

An SVG is a vector image: a text file of instructions such as “draw a circle here, this wide, filled with this colour”. The device redraws it at whatever size is needed, so it is equally sharp on a phone, a 4K monitor and a billboard.

Side by side

When to use SVG

• Logos. One file serves every size, from a browser tab to a printed banner.
• Icons and interface graphics. They stay crisp on high-density screens and can change colour with CSS.
• Charts, diagrams and maps built from lines, shapes and text.
• Simple illustrations with flat colours.

When to use PNG

• Screenshots. They are pixels to begin with.
• Detailed images with transparency, such as a cut-out product photo.
• Anywhere SVG is not accepted: most social networks, many marketplaces, email signatures and office documents in older software.
• App and site icons at fixed sizes, such as a 180 pixel touch icon. The Favicon Generator makes these from one image.

Advantages and disadvantages

SVG

Advantages

• Perfectly sharp at every size
• Very small files for simple artwork
• Can be styled, animated and made accessible with text labels

Disadvantages

• Not suitable for photographs
• Blocked by many upload forms for security reasons, because an SVG can contain scripts
• Complex artwork can become large and slow to draw

PNG

Advantages

• Works in every program and on every platform
• Exact, lossless pixels with transparency
• Predictable: it looks the same everywhere

Disadvantages

• Blurs when enlarged
• Large files at high resolutions
• You need several sizes for different screens

Converting between them

SVG to PNG is straightforward: the shapes are simply drawn at the pixel size you ask for. Export at two or three times the size you intend to display, so the result stays sharp on high-density screens.

PNG to SVG is a different matter. Software has to trace the edges it finds in the pixels and guess the shapes. Clean, flat logos trace reasonably well; photographs and soft gradients do not. If you need a vector logo, the best source is the designer’s original file, usually in AI, EPS, PDF or SVG format.

A note on safety

Because an SVG is code, a file from an unknown source can contain scripts. Browsers block these when an SVG is shown as an ordinary image, but it is the reason many sites refuse SVG uploads. Only use SVG files from sources you trust, and expect to supply a PNG as well.

The simple rule

If it was drawn, use SVG. If it was photographed or captured from a screen, use a pixel format. And keep a PNG export of every logo for the places that will not take the SVG.