SVG vs PNG: Which Image Format to Use, and When

Open the assets folder of almost any website and you will find two kinds of image sitting side by side: PNGs and SVGs. Both handle logos, icons and transparent backgrounds, so it is easy to treat them as interchangeable.

They are not. One is a grid of pixels and the other is a set of drawing instructions, and that difference decides how each file looks, how big it gets and where you can actually use it.

Here is how the two formats work, where each one shines, and a simple way to choose between them.

The short answer

Use SVG for flat graphics that need to stay sharp at any size: logos, icons, simple illustrations, charts and interface elements on a website.

Use PNG for anything with photographic detail or complex texture, and for any place that does not accept SVG, such as social media uploads, most email clients and many document tools.

Plenty of projects need both. A logo is often designed and stored as an SVG, then exported to PNG for the places where SVG is not welcome.

How a PNG works

PNG is a raster format. The image is stored as a fixed grid of pixels, each with its own colour value, and an optional alpha channel that controls how transparent each pixel is.

Its compression is lossless, so saving a PNG again and again never degrades it. That makes it a dependable format for screenshots, interface mockups and graphics with crisp edges and text.

The catch is that a PNG has a fixed resolution. Scale a 200-pixel-wide logo up to 800 pixels and the browser has to invent the missing detail, which is why enlarged PNGs look soft or blocky.

How an SVG works

SVG stands for Scalable Vector Graphics. Instead of pixels, the file describes shapes: a circle here, a curve there, filled with this colour and outlined with that one.

Those instructions are written in XML, a plain-text markup language. You can open an SVG in a code editor, read it, and even change a colour by editing a single line.

Because the browser redraws the shapes at whatever size is needed, an SVG stays perfectly sharp on a small phone screen, a 4K monitor and a printed banner. If the idea of pixels versus paths is new to you, our guide to vector vs raster images covers it in more depth.

Sharpness and scaling

This is where SVG wins most clearly. One SVG file covers every screen density, so there is no need to export a 1x, 2x and 3x version of the same icon.

A PNG has to be made large enough for the biggest size it will ever be shown at. For high-density screens that usually means exporting at twice the displayed size, which also makes the file heavier.

For photographs the advantage disappears. A photo cannot be described as a handful of shapes, so it belongs in a raster format whatever the screen.

File size: it depends on the image

A simple icon saved as SVG is often just a few hundred bytes to a couple of kilobytes, smaller than the same icon as a PNG. Because SVG is text, it also compresses well when servers send it gzipped.

The picture changes as detail grows. An SVG made by auto-tracing a photo can contain thousands of paths and end up much larger than a decent PNG, while also looking worse.

A useful rule: the fewer distinct shapes and colours an image has, the better a candidate it is for SVG. Tools such as SVGO can also strip editor metadata from exported SVGs and shrink them noticeably.

Transparency, styling and animation

Both formats handle transparency well. PNG does it with its alpha channel, and SVG is transparent anywhere you have not drawn a shape.

SVG can do several things a PNG cannot. When it is placed inline in a page, its colours can be changed with CSS, so an icon can switch colour on hover or adapt to dark mode without a second file.

Inline SVGs can also be animated with CSS or JavaScript, and their text stays real text. A PNG is a finished picture; to change anything, you export a new one.

Where SVG doesn't work

SVG's flexibility comes with limits. Because the format can contain scripts and links, many platforms refuse SVG uploads for security reasons. WordPress, for example, blocks them unless you add a plugin.

Social networks generally want PNG or JPG for profile pictures and posts. Email is another weak spot: support for SVG in email clients is patchy, and Gmail does not display it, so logos in email signatures and newsletters are safer as PNG.

Office documents, older design tools and some print workflows can also struggle with SVG. When in doubt, keep a PNG version ready.

Converting SVG to a transparent PNG

Turning an SVG into a PNG is easy and loses nothing, as long as you export at the size you need. Since a vector has no fixed resolution, you choose the pixel dimensions at export time.

In Figma, Illustrator or Inkscape, export the artwork as PNG and make sure the background is left empty rather than filled with white. Inkscape, for instance, keeps the page background transparent by default when exporting PNG.

Export larger than you think you need. A PNG can always be scaled down cleanly, but scaling it back up brings the blur back.

Converting PNG to SVG

Going the other way is harder, because pixels have to be turned into shapes. This process is called tracing, and it works well for logos, line art and flat graphics with a few clean colours.

Our free PNG to SVG converter does this in the browser, so you can test whether an image traces cleanly before redrawing anything by hand. Photos and soft gradients rarely give good results.

For a closer look at what happens during tracing and how to prepare a file for it, see how image tracing works.

Where WebP fits in

If you are comparing WebP vs PNG for a website, WebP is often the better raster choice. It supports both lossless and lossy compression, transparency and animation.

Google reports that lossless WebP files are around 26 percent smaller than equivalent PNGs, and all current major browsers support the format. PNG still has the edge for compatibility outside the browser, in editing software and in files you send to other people.

WebP does not replace SVG, though. It is still a pixel format, so the scaling argument stays exactly the same.

A quick way to decide

Ask what the image is. If it is a logo, icon, simple illustration or diagram made of flat shapes, start with SVG.

If it is a photo, a detailed painting, a screenshot or anything with soft texture, use a raster format: PNG when you need lossless quality or transparency, WebP for lighter web pages, and JPG for photos where small files matter most. Our comparison of the difference between JPG and PNG can help with that last choice.

Then ask where the image is going. A website can use SVG freely, but email, social media and many upload forms will want a PNG.

Keep both versions

For brand assets, the most practical setup is to keep the SVG as the master file and export PNGs from it whenever a platform asks for one.

That way every PNG is generated fresh at the right size, and you never end up enlarging a small raster copy because the original was lost.

Cover image: Yug, modifications by Cfaerber et al., CC BY-SA 2.5, via Wikimedia Commons.