Raster vs Vector Graphics: The Complete Guide

Raster graphics (PNG, JPEG, GIF, BMP) store an image as a fixed grid of pixels, each with its own color. Digital cameras, scanners, and screenshots all produce raster images, because that's how light sensors and screens actually capture and display images — pixel by pixel.

The tradeoff is resolution dependence: a raster image looks correct only up to its native pixel dimensions. Beyond that, the software has to guess new pixel values to fill in the gaps, which is why enlarged raster images look soft or blocky.

Raster file size scales with pixel count and color complexity rather than with how visually "simple" the image is — a plain white square at high resolution can still be a large file before compression, while compression formats like JPEG and PNG exist specifically to shrink that footprint back down for storage and transfer.

Vector graphics (SVG, EPS, AI, PDF-as-vector) store an image as mathematical descriptions of shapes: points, lines, and curves, each with a defined fill or stroke. There's no fixed resolution, because the shapes are recalculated fresh every time the image is displayed or printed.

This makes vectors ideal for anything that needs to scale — logos, icons, typography, technical illustrations, and cut paths for machines like laser cutters or Cricut and Silhouette machines.

Vector file size instead scales with how many distinct shapes and anchor points a design needs, which is why a simple geometric logo can be a tiny file while a highly detailed vector illustration with thousands of nodes can actually exceed the size of an equivalent raster image.

Within raster formats, the differences mostly come down to compression and transparency: JPEG uses lossy compression tuned for photographs and doesn't support transparency; PNG uses lossless compression and supports a full alpha channel, making it the default for icons and graphics with transparent backgrounds; GIF supports only 256 colors but allows simple frame-based animation; BMP stores pixels with little or no compression, resulting in large, uncompressed files rarely used outside of legacy Windows software.

Within vector formats, SVG is the open, XML-based standard built for the web and readable by any browser; AI is Adobe Illustrator's native project format, which can contain vector data, layers, and editing history; EPS is an older, print-industry-standard vector format still requested by some sign shops and promotional-product vendors; and PDF can contain either vector or raster data (or both at once), which is why a PDF isn't automatically "a vector file" just because it opens in a vector editor.

Going from vector to raster ("rasterizing") is simple: render the shapes into a pixel grid at whatever size you need, which is what happens automatically when you export a PNG from a design tool.

Going the other direction — raster to vector — requires tracing: analyzing the pixel grid, grouping similar colors, and fitting mathematical curves to the boundaries between them. See how image tracing works for a full breakdown of that process, or convert a PNG to SVG directly. If the raster image is specifically a logo, the logo-to-SVG guide covers the settings that give the cleanest result.