File Formats

SVG vs PNG: When Each One Wins

Learn the difference between SVG and PNG, how each format works, why SVGs stay sharp at any size, and when PNG is still the better choice.

SVG vs PNG: When Each One Wins

SVG and PNG are two of the most common image formats on the web.

Both support transparency.

Both can look sharp.

Both are widely supported across browsers and devices.

Because they often appear interchangeable, many people assume one is simply a newer version of the other.

They aren’t.

SVG and PNG solve fundamentally different problems.

Understanding that difference explains why a company logo is usually better as an SVG, while a screenshot is almost always better as a PNG.

What Is a PNG?

PNG stands for Portable Network Graphics.

It is a raster image format.

That means a PNG stores an image as a grid of pixels.

Every pixel contains colour information.

A PNG measuring:

1000 × 1000

contains:

1,000,000 pixels

Those pixels are stored directly in the file.

When the image is displayed, the computer simply renders those stored pixels.

What Is an SVG?

SVG stands for Scalable Vector Graphics.

Unlike PNG, SVG is a vector format.

Instead of storing pixels, an SVG stores instructions describing shapes.

A simple SVG might contain instructions such as:

Draw a circle
Radius = 50
Colour = Blue

Or:

Draw a rectangle
Width = 200
Height = 100

The browser generates the image from those instructions.

This distinction changes almost everything.

The Difference That Actually Matters

Most explanations focus on:

PNG = Raster
SVG = Vector

While true, that doesn’t really explain why developers care.

The practical difference is much simpler.

PNG Stores Appearance

A PNG stores exactly what the image looks like.

SVG Stores Instructions

An SVG stores instructions for creating the image.

This difference affects scaling, file size, editing, and performance.

Why SVG Stays Sharp

Suppose you create a logo.

As a PNG:

500 × 500

As an SVG:

Vector Instructions

Now enlarge both to:

5000 × 5000

The PNG must stretch its existing pixels.

Eventually it becomes blurry.

The SVG simply redraws the shapes at the new size.

The result remains perfectly sharp.

This is the biggest advantage of SVG.

Why PNG Becomes Pixelated

A PNG contains a fixed number of pixels.

Those pixels cannot magically increase.

When enlarged, software must estimate new pixels between the existing ones.

This process inevitably reduces image quality.

The larger the scaling factor, the more noticeable the degradation becomes.

This is why low-resolution logos often look terrible when enlarged.

Why SVG Files Are Often Smaller

Consider a simple company logo.

The logo may contain:

  • A circle
  • A few lines
  • Some text

An SVG stores instructions describing these elements.

The resulting file may only be a few kilobytes.

A PNG must store every individual pixel.

Even a small logo can become much larger.

For simple graphics, SVG frequently wins on file size.

Why SVG Isn’t Always Smaller

A common misconception is:

SVG = Smaller

Not always.

Imagine a highly detailed illustration containing:

  • Thousands of paths
  • Complex gradients
  • Intricate shapes

The SVG instructions can become extremely large.

In some cases, a PNG may actually be smaller.

The content matters more than the format itself.

Why Screenshots Should Usually Be PNG

Consider a screenshot of a website.

The image contains:

  • Text
  • Icons
  • Buttons
  • Photos
  • Gradients
  • Shadows

Representing all of that as vector instructions would be extremely inefficient.

PNG stores the visual result directly.

This makes it a much better fit.

Screenshots are one of the clearest examples of where PNG wins.

Why Logos Should Usually Be SVG

Logos often contain:

  • Shapes
  • Lines
  • Text
  • Simple graphics

These elements map perfectly to vector instructions.

Benefits include:

  • Infinite scalability
  • Smaller file sizes
  • Easy colour changes
  • Crisp rendering on high-DPI displays

This is why professional designers almost always provide logo assets in vector formats.

SVG vs PNG for Website Performance

Performance depends on the type of image.

Simple Icons

SVG usually wins.

Examples:

  • Navigation icons
  • Social media icons
  • UI controls

The files are often tiny and scale perfectly.

Photographs

PNG usually loses.

Photographs contain enormous amounts of pixel information.

Formats such as:

  • JPG
  • WEBP
  • AVIF

are usually better choices.

Logos

SVG usually wins.

Screenshots

PNG usually wins.

SVG and Retina Displays

Modern displays contain extremely high pixel densities.

A PNG may require multiple versions:

1x
2x
3x

to remain sharp.

An SVG requires only one file.

The browser renders it at whatever resolution is needed.

This simplifies asset management significantly.

SVG Can Be Styled With CSS

One unique advantage of SVG is that it behaves more like code than an image.

Consider:

.logo {
  fill: blue;
}

The SVG can change colour dynamically.

Developers can:

  • Change colours
  • Animate shapes
  • Apply hover effects
  • Respond to themes

This level of flexibility isn’t possible with a standard PNG.

SVG Can Be Animated

SVG supports animation directly.

Examples include:

  • Loading indicators
  • Interactive diagrams
  • Animated logos
  • Charts

Animations can be controlled using:

  • CSS
  • JavaScript
  • SVG animation attributes

PNG files cannot provide this type of behaviour.

Security Considerations

SVG files are effectively XML documents.

A simple SVG might contain:

<svg>
  <circle />
</svg>

Because SVG contains markup, it can potentially include scripts and external references.

Applications that accept user-uploaded SVGs often need additional security controls.

PNG files do not present the same risks.

This is one reason some platforms restrict SVG uploads.

SVG vs PNG

FeatureSVGPNG
Format TypeVectorRaster
Scales Without Quality LossYesNo
Fixed ResolutionNoYes
Transparency SupportYesYes
Ideal for LogosYesSometimes
Ideal for ScreenshotsNoYes
Ideal for PhotographsNoRarely
CSS StylingYesNo
Animation SupportYesNo
Retina FriendlyExcellentRequires Larger Images

Neither format is universally better.

Each excels in different situations.

Common Mistakes

Saving Logos as PNG Only

This limits scalability and often causes quality issues later.

Using SVG for Photographs

Photographs are not well suited to vector representation.

Assuming SVG Is Always Smaller

Complex vector artwork can become surprisingly large.

Using PNG for Simple Icons

Many icons can be represented much more efficiently as SVG.

Which Format Should You Choose?

A simple rule works surprisingly well.

Choose SVG when the image is primarily:

  • Shapes
  • Lines
  • Text
  • Icons
  • Logos
  • Diagrams

Choose PNG when the image is primarily:

  • Screenshots
  • Pixel art
  • Detailed raster artwork
  • Images that must preserve exact pixel data

This guideline solves most image format decisions.

Conclusion

SVG and PNG may both appear as image files, but they work in completely different ways.

PNG stores pixels. SVG stores instructions.

This allows SVG images to scale indefinitely without losing quality, making them ideal for logos, icons, diagrams, and user interface graphics. PNG files remain a strong choice for screenshots, raster artwork, and situations where exact pixel data matters.

The best format depends less on the file extension and more on the content itself. If the image is built from shapes and lines, SVG will often provide better scalability and flexibility. If the image is built from pixels, PNG is usually the better choice.