The Difference Between Vector and Raster Graphics

Whether you're designing a logo, preparing a presentation, or sending artwork to a printer, understanding the fundamental difference between vector and raster graphics is essential. Using the wrong format can result in pixelated disasters or unnecessarily massive file sizes.

Raster Graphics: Painting with Pixels

Raster images (also known as bitmap images) are made up of a grid of tiny colored squares called pixels. When you take a photo with your smartphone, it creates a raster image. The most common raster formats are JPEG, PNG, GIF, and TIFF.

The defining characteristic of a raster image is that it is resolution-dependent. It has a specific, fixed number of pixels. If you try to enlarge a raster image beyond its original size, the software simply stretches those existing pixels, resulting in a blurry, blocky, "pixelated" appearance.

Best for: Photographs, complex illustrations with soft color blending, and web graphics.

Vector Graphics: Math in Motion

Vector graphics are entirely different. Instead of a grid of pixels, vectors are created using mathematical formulas that define shapes, lines, curves, and colors. The most common vector formats are SVG, EPS, and AI.

Because they are based on mathematics, vector graphics are infinitely scalable. You can take a vector logo designed for a business card and blow it up to the size of a highway billboard, and it will remain perfectly crisp and sharp, without adding a single byte to the file size.

Best for: Logos, typography, iconography, and flat illustrations.

Converting Between the Two

Converting a vector image to a raster image (rasterization) is easy. When you save an Illustrator file as a PNG, the software simply paints the mathematical shapes onto a grid of pixels. You can do this easily with tools like AIOConverter.

However, converting a raster image to a vector (vectorization or tracing) is much more difficult. You can't easily turn a complex photograph into math. While there are auto-tracing tools available, they usually only work well for simple, high-contrast images like scanned sketches or simple logos.