SVG vs PNG: Which Should You Use?

SVG and PNG look similar in a browser — both can show a logo or an icon — but they store the image in fundamentally different ways, and that difference decides which one you should reach for.

SVG: math, not pixels

An SVG (Scalable Vector Graphic) file describes an image as shapes, paths, and coordinates — actual XML markup a browser interprets and draws on the fly. Because it’s math rather than a fixed grid of pixels, an SVG looks identical whether it’s rendered at 16px or 1600px. There’s no “zooming in until it gets blurry.”

You can open one in a text editor and read it:

<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
  <circle cx="50" cy="50" r="40" fill="#2563eb"/>
</svg>

That’s a complete image file — a blue circle, in about 120 bytes, sharp at any size. The PNG equivalent at 1000×1000 would be tens of kilobytes and blurry at 2000px.

That makes SVG the right choice for:

• Logos and icons — anything that needs to look sharp at wildly different sizes.
• Simple illustrations and diagrams — flat colours, clean lines.
• Anything you’ll want to recolour or restyle with CSS later, since the shapes stay editable.

It’s the wrong choice for photographs or anything with complex gradients and texture — describing a photo as vector paths would be enormous and pointless.

PNG: a fixed grid of pixels

A PNG is a raster image: a fixed-size grid where every pixel’s colour is stored directly. It supports full transparency and lossless compression, which is why it’s the default for screenshots, UI mockups, and any image where exact pixel fidelity matters more than file size.

The tradeoff is the flip side of SVG’s advantage: a PNG has one native resolution. Scale it up past that and it gets soft or blocky, because there’s no underlying shape data to redraw — only pixels to stretch.

Side by side

	SVG	PNG
Stores	Shapes and coordinates	A grid of pixels
Scales up	Infinitely, no quality loss	Gets blurry past native size
Best for	Logos, icons, diagrams	Photos, screenshots, textures
Transparency	Yes	Yes
Animatable	Yes, via CSS or SMIL	No (that’s APNG or GIF)
Styleable with CSS	Yes	No
Searchable text inside	Yes	No
File size for a logo	Usually tiny	Grows with dimensions
File size for a photo	Absurd	Reasonable
Security considerations	Can contain scripts	Inert

The practical rule

If the source is inherently vector — a logo made in Illustrator or Figma, an icon set — keep it as SVG as long as possible, and only rasterize to PNG at the specific size a particular use case needs: a favicon, an <img> tag for an email client that can’t render SVG, an og:image for social previews.

If the source is a photo or screenshot, it was never vector to begin with. PNG, or JPG/WebP for smaller file size, is the only sensible choice. Converting a photo to SVG doesn’t make it vector — it either traces it into thousands of clumsy paths that look worse and weigh more, or simply embeds the original pixels inside an SVG wrapper, which gains you nothing.

Where SVG catches people out

SVG can execute JavaScript. Because it’s XML the browser parses, an SVG can carry <script> tags and event handlers. That’s harmless for files you authored, and a genuine attack surface for files your users upload. Never serve user-supplied SVGs from your main domain without sanitising them first — this is the one meaningful security difference between the two formats.

Fonts don’t travel. An SVG referencing “Helvetica Neue” renders with whatever the viewing machine has, which may be nothing like your design. Convert text to outlines before exporting anything where the typography matters. The trade is that outlined text is no longer selectable or searchable.

Email clients are hostile territory. Support for SVG in email is poor and inconsistent. For anything going into an email template, rasterize to PNG and move on.

Exports are often bloated. Design tools happily emit SVGs full of editor metadata, empty groups, and paths carrying sixteen decimal places of precision. Running an export through an optimizer routinely cuts the file by half or more without touching how it looks.

A viewBox is not optional. An SVG without one has no intrinsic aspect ratio, which is how you end up with a logo that renders at some arbitrary size or collapses entirely inside a flex container. If your export is behaving unpredictably, this is the first thing to check.

What about WebP and AVIF?

They compete with PNG, not SVG — both are raster formats. For photographic content WebP typically lands 25–35% smaller than PNG at equivalent quality, and AVIF smaller still. Neither changes the vector-versus-raster decision: if your image is a logo, SVG still wins on every axis that matters.

Where PNG remains the safer raster pick is exact pixel fidelity and universal support — screenshots destined for documentation, images heading into a pipeline you don’t control, anything that needs to open everywhere without a decoder question.

Converting SVG when you need a raster version

SVG to PNG and SVG to JPG rasterize a vector file at your chosen size — useful for anywhere SVG isn’t supported, like some email clients or older image pipelines. Pick your dimensions deliberately: this is the moment you commit to a resolution, and going back for a larger one means re-exporting from the vector, not upscaling the PNG.

If you need a genuine vector PDF instead of a raster export, for print or CAD-adjacent workflows, SVG to PDF keeps the output fully vector — the shapes stay shapes, and the result stays sharp at any print size. And once you have a PNG, PNG to WebP can shrink it further for the web without another round trip through an editor.