Vector vs Raster Graphics: When to Use Each

A logo blurs when you blow it up for a banner. A photo can’t be saved as SVG. A web icon set scales perfectly across every device size. These three observations all trace back to the same distinction: vector vs raster graphics. Understanding the difference helps you pick the right format for each job.

Raster: a grid of pixels

A raster image stores actual pixel data — a grid of colored squares. Each pixel has a specific color value, and the image is the arrangement of those values.

File formats: JPG, PNG, WebP, GIF, BMP, HEIC, TIFF.

Properties:

Fixed resolution: a 1920 × 1080 image has exactly 1920 × 1080 pixels. No more, no less.
Quality limited by pixel count: you can scale a raster image larger, but the original pixels just get bigger and blurrier. No detail magically appears.
Great for continuous-tone images: photographs, paintings, anything with smooth gradients and complex color variation
File size grows with dimensions and quality: a 4000 × 3000 photo is much bigger than 800 × 600
Compresses well with lossy formats (JPG, WebP, HEIC)

Every digital photograph is a raster image. Every screenshot is raster. Almost every image you see online is raster.

Vector: mathematical shapes

A vector image stores mathematical descriptions of shapes — points, lines, curves, fills. The actual displayable image is generated by the software interpreting those instructions.

File formats: SVG (most common on web), AI (Adobe Illustrator), EPS (legacy), PDF (can contain vectors).

Properties:

Infinitely scalable: a vector logo at 16 × 16 pixels and 1600 × 1600 pixels looks equally crisp. The math doesn’t change with display size.
Quality independent of resolution: a 2 KB vector file can render to any size
Limited to “describable” content: shapes, lines, gradients, text. Not great for photographs.
Small file sizes for the type of content they’re good at: a complex logo is often 5-50 KB
Editable as primitives: you can modify each shape independently in a vector editor

Logos are usually vectors. Icon sets are usually vectors. Charts and diagrams are usually vectors. Type and typography are stored as vectors.

The decision: which to use

Use raster (JPG, PNG, WebP) for:

Photographs (always)
Screenshots (almost always)
Detailed paintings or digital artwork with painterly textures
Anything captured by a camera
Anything that needs to look the same as the source on every device

Use vector (SVG, AI) for:

Logos
Icons
Diagrams and charts
Maps with clean shapes
Typography you want to scale or edit
Anything that needs to look crisp at any size

The gotchas

A raster logo is fragile. A company logo saved only as a 400 × 400 PNG can’t be enlarged for a billboard without blurring. If you have a logo to maintain, get the original vector (AI, EPS, SVG) from the designer. Don’t lose it.

A photo can’t become a vector without manual recreation. Tools like Adobe Illustrator’s “Image Trace” produce a vector approximation, but it’s not the original — it’s a simplified line-art version. For full photo quality, raster is the only option.

SVG can include raster images embedded. A “vector” file might actually contain raster data nested inside. Saving as SVG doesn’t magically vectorize everything.

Conversion is asymmetric. Vector → raster is easy (just render at a chosen size). Raster → vector is hard (requires interpretation).

Common use case: logos and icons

A logo lives in multiple sizes:

Tiny favicon (16 × 16)
Email signature (200 × 50)
Website header (400 × 100)
Marketing material (1200 × 400)
Billboard (10000 × 3000)

A vector logo scales to all of these from one source file. The math renders crisp at every size.

A raster logo needs different versions at each size — or you start with the largest size and downscale (works) — but you can never upscale beyond the original resolution without quality loss.

Professional logo work always delivers a vector master file (AI, SVG, or EPS) plus rendered raster copies (PNG at various sizes) for direct use.

Common use case: web graphics

For website assets:

Photographs: raster (JPG or WebP) — required, no vector option
Icons (UI buttons, navigation, status indicators): vector (SVG) — scales perfectly across device sizes including high-DPI displays
Decorative shapes (background patterns, dividers): vector (SVG) — small files, scale well
Hero images (large banners): usually raster, sometimes mixed

Modern web design has shifted heavily toward SVG for non-photographic content. Crisp on every screen, small files, easy to style with CSS.

Common use case: print

For print, vectors are often required:

Logos on printed materials: vector ensures crispness at the print resolution
Type set in design software: stored as vectors so it prints sharp
Photos in print: raster, but high resolution (300 DPI at the print size)

A “low-resolution raster logo” on a printed brochure is a common amateur design mistake. The logo looks crisp on screen at small size but pixelated when printed.

Converting between formats

Vector → Raster (for delivering to systems that expect raster):

SVG to PNG: rasterize at a chosen size
SVG to JPG: rasterize as JPG (no transparency)
Adobe Illustrator: Export As → choose raster format and resolution
Browser: open SVG, screenshot or right-click → Save Image

Raster → Vector (harder; usually requires manual work):

Adobe Illustrator → Image Trace: automated tracing; quality varies
Inkscape → Trace Bitmap: free alternative
Manual recreation: redraw the image as vectors in an illustration program; only path for high-quality conversion
Online auto-tracers: Vector Magic, AutoTracer.org; quality depends on source

For a clean logo, a designer can recreate it as a vector in 30-60 minutes given a clear raster reference.

File size comparison

Raster (typical photograph):

800 × 600 JPG: ~80 KB
1920 × 1080 JPG: ~300 KB
4000 × 3000 JPG: ~2 MB

Vector (typical logo):

Simple logo as SVG: 2-10 KB
Complex logo with multiple shapes as SVG: 20-50 KB

Vectors are tiny for the type of content they describe well. They get big only when you describe complex curves, gradients, and many shapes.

What if you don’t know which type you have?

Check the file extension:

.jpg, .jpeg, .png, .webp, .gif, .bmp, .heic, .tiff = raster
.svg, .ai, .eps, .pdf (sometimes) = vector

For PDFs: they can contain either. Open in a vector tool (Illustrator, Inkscape) and see if you can edit individual elements as paths — if yes, the content is vector.

TL;DR

Raster = grid of pixels (JPG, PNG, WebP, HEIC). Fixed resolution. Used for photos, screenshots.
Vector = mathematical shapes (SVG, AI, EPS). Infinitely scalable. Used for logos, icons, diagrams.
Raster → Vector is hard; usually requires manual recreation
Vector → Raster is easy; use SVG to PNG or SVG to JPG
For logos: always preserve a vector master file
For photos: raster is the only option
For web icons in 2026: prefer SVG for scalable, crisp rendering across device sizes