Vector vs Raster Images: The Difference That Actually Matters

Raster images store pixels. Vector images store drawing instructions.

That difference matters most when an asset has to change size. A photograph is naturally represented as pixels, while a logo made from a few shapes can be redrawn from vector geometry at almost any size.

Raster Images Store a Fixed Pixel Grid

A raster image is a grid of pixels, with each pixel carrying colour information.

A 4000 × 3000 photograph contains 12 million pixel positions. Formats such as JPG, PNG, WebP, AVIF, GIF, BMP, and TIFF can store raster imagery, although they use different compression methods and support different features.

Raster images are a natural fit for:

photographs
screenshots
painted or textured artwork
pixel art

The image has a fixed pixel resolution. Displaying it much larger than that resolution requires interpolation, which can make edges and detail appear soft or pixelated.

Vector Images Store Shapes and Paths

Vector graphics describe geometry rather than a fixed pixel grid.

A simple vector file might effectively say:

draw a circle at these coordinates
give it this radius
fill it with this colour

SVG is the main vector format used directly on the web. EPS and application formats such as AI are also used in design and print workflows. PDF can contain vector graphics, raster images, or both.

Because the geometry is recalculated when rendered, a vector logo can be displayed at 100 pixels wide or printed on a large sign without the source artwork acquiring pixelation.

Scaling Is the Practical Difference

Suppose a logo exists only as a 500 × 500 PNG.

If it is enlarged to 5000 × 5000 pixels, the software has to estimate additional pixel values. The source does not contain ten times more geometric detail simply because the output is larger.

The same logo stored as vector paths can be rendered again at the larger size from its geometry.

Vector scaling applies to the geometry in the file. Raster effects embedded inside a vector document still have their own resolution, and extremely complex vector artwork can become expensive to render. For ordinary logos, icons, and diagrams, however, scaling is one of the main reasons to keep a vector source.

Photographs Usually Belong in Raster Formats

A photograph contains irregular textures, gradients, noise, shadows, and millions of colour variations. Representing all of that as a large collection of vector shapes is usually inefficient and difficult to edit.

Raster formats are designed for this kind of pixel-based imagery. The delivery format then depends on requirements such as compression, transparency, browser support, and acceptable quality loss.

For example, JPG commonly suits photographs when lossy compression is acceptable, while PNG is useful when exact raster pixels or alpha transparency matter.

Logos, Icons, and Diagrams Often Suit Vectors

Simple graphics map well to paths, shapes, strokes, fills, and text.

That makes vector artwork a strong fit for:

logos
icons
charts
technical diagrams
simple illustrations
interface symbols

On the web, SVG can also be styled or manipulated with CSS and JavaScript when it is embedded in a form that exposes its elements.

A vector source is also useful outside the browser. The same logo artwork can produce a small web icon, a business card asset, or large-format print output without maintaining separate source drawings for each size.

File Size Depends on the Content

File size does not follow directly from the vector/raster distinction.

A logo made from a few paths may be tiny as SVG. A detailed illustration containing thousands of paths, gradients, masks, and effects can produce a large vector file.

Raster size also depends on more than dimensions. Compression method, image complexity, colour information, metadata, and quality settings all affect the result.

Compare the exported assets when file size matters.

Converting Between Vector and Raster Changes What You Have

Exporting vector artwork to PNG or JPG is straightforward: choose an output size and rasterize the artwork. The exported file then has a fixed pixel resolution.

Going in the other direction is less direct. Tracing software can infer shapes from a raster image, which can work well for simple, high-contrast logos or line art. It does not recover the original vector geometry.

Photographs are particularly poor tracing candidates because the result may require huge numbers of shapes while still losing useful detail.

Keep the editable vector source when future scaling or shape editing matters.

Use Both on Websites

Most sites need both categories.

Content	Typical choice
Photograph	Raster: JPG, WebP, AVIF
Screenshot	Raster: PNG or another suitable raster format
Logo	Vector: often SVG
UI icon	Vector: often SVG
Detailed raster artwork	Raster
Diagram made from simple shapes	Vector

These choices cover common cases. A raster logo may be required by a particular system, and an illustration may be easier to deliver as a raster image even if it was created from vectors.

For print, the same distinction still matters. Vector artwork is convenient for logos and line work that must scale, while photographs need enough raster resolution for their intended physical size.

Choose Based on the Source Information

Ask what information the asset needs to preserve.

If the image is fundamentally a grid of photographic or painted pixels, use a raster workflow. If it is fundamentally geometry that should remain editable and scalable, keep a vector source.

The delivery format can change later. Preserving the right kind of source artwork is harder to recover after it has been flattened or compressed.