SVG vs PNG: Vector vs Raster for Icons and Logos

Vector vs raster: the difference everything else follows from

PNG is a raster format. It stores a fixed grid of pixels — a 512×512 PNG holds 262,144 individual colour values, and that is all the information there is. Enlarge it and the browser has to invent the pixels in between, which is why blown-up PNGs look soft or blocky.

SVG is a vector format. It stores instructions rather than pixels: draw a circle here, fill this path with that colour, place this curve between these points. The renderer executes those instructions at whatever size is asked for, so an SVG is exactly as sharp on a 4K display as on a phone, and at any zoom level.

Almost every practical difference below comes from that one distinction.

When SVG is the right answer

Logos and brand marks. A logo appears on a business card and a billboard. One SVG covers both; a PNG needs a separate export per size and still degrades if someone scales it beyond what you exported.

Icons and UI elements. Sharp at any density, and typically a fraction of the file size of the equivalent PNG set.

Illustrations and diagrams built from flat shapes and lines.

Anything that needs to change. SVG is text under the hood, so you can restyle it with CSS — recolour on hover, adapt to dark mode, animate a path — without exporting a new file.

Charts and data visualisations, which stay legible when zoomed and can carry accessible text.

When PNG is the right answer

Photographs. This is the hard limit. A photo has no shapes to describe — it is millions of subtly varied pixels. Tracing it to vector produces either a huge file or a poster-like approximation. For photos use PNG, or better, JPG for size.

Screenshots. Same reason: pixel content, not shapes.

Complex textures, gradients and effects like realistic shadows or noise, which vector describes clumsily and expensively.

Anywhere SVG is not accepted. Plenty of platforms — many social networks, some email clients, older tooling — will not take SVG uploads. PNG is accepted essentially everywhere.

When you need a guaranteed pixel-exact result that cannot depend on a renderer's interpretation.

File size: it depends on complexity, not dimensions

This is the part people get backwards. A PNG's size is driven by its dimensions — more pixels, bigger file. An SVG's size is driven by its complexity — more paths and points, bigger file. Dimensions are irrelevant to an SVG; you can scale it to any size for free.

So a simple icon is dramatically smaller as SVG, and stays that size at every resolution. But a heavily detailed illustration with thousands of nodes, or a photo that has been auto-traced, can easily produce an SVG larger than the PNG it replaced — sometimes much larger.

The rule of thumb: if you can describe the image in shapes, SVG wins. If you would have to describe it pixel by pixel, PNG wins.

Transparency, and the edge-quality difference

Both support transparency, and this is a genuine tie on capability — but not on quality at the edges.

PNG has a full alpha channel, giving smooth semi-transparent edges. Those edges are anti-aliased at export, at one fixed resolution. Scale the PNG up and you scale the anti-aliasing with it, which is where halos and fuzz appear.

SVG has no baked-in edges at all. The renderer anti-aliases at display time, at the device's actual resolution, so edges are clean at every size. For a logo placed over varying backgrounds at varying sizes, that difference is visible.

The practical gotchas

SVG is code, so treat uploads as code. An SVG file can contain scripts. Never accept user-uploaded SVGs onto your site without sanitising them — this is a real, routinely exploited attack vector, and it is the main reason many platforms refuse SVG uploads at all.

Fonts do not travel. If an SVG references a font the viewer does not have, the text reflows or falls back and the design breaks. Convert text to outlines before shipping a logo, or embed the font.

You cannot convert a photo to SVG in any useful sense. Auto-tracing produces a flat, posterised approximation at a large file size. If a tool offers photo-to-SVG, understand what it is actually doing.

Exported SVGs are usually bloated. Design tools leave editor metadata, unused definitions and excessive decimal precision in the file. Running an optimiser routinely cuts the size substantially with no visible change.

Using both together

The usual production answer is not one or the other. Ship SVG as the primary asset for logos and icons, and keep a PNG fallback for the places that will not take SVG — email templates, certain social platforms, and any legacy tooling in your stack.

If you are working the other way and need a raster export from a vector source, or a PNG for a platform that rejects SVG, our SVG to PNG converter handles it. For the logo-specific decision in more detail, see PNG vs SVG for logos.