Raster vs Vector: Why SVG Is Different

A raster file stores a grid of pixels. A vector file stores instructions. A PNG of a red circle records a colour value for every pixel in, say, a 512×512 grid. An SVG of the same circle records something closer to a sentence: draw a circle at this point, this big, fill it red.

Almost everything people find confusing about SVGs follows from that one difference.

Why an SVG never goes blocky

Because instructions have no size. “A circle of radius 90” is a proportion, not a pixel count. Ask a browser to draw it at 64px and it does the maths at 64px; ask for 4000px and it does the same maths again. Both come out equally sharp, from the same small file.

A raster has no such move available. It is a mosaic — convincing from across the room, and unmistakably made of tiles once you get close enough. That 512×512 grid is the entire contents of the file. Blow it up to 2000px and the renderer has to invent pixels that were never recorded, by averaging the neighbours it has. That is what “blurry” and “blocky” actually are: guesswork filling gaps. Detail that was never stored cannot be recovered.

It is also why a vector has no meaningful DPI. DPI is a label on a pixel grid — an instruction about how large to print the dots. A vector has no grid to label. You give it a size, and it renders to fit.

The usual problem: something won't accept your SVG

This is what sends most people looking. Social profile fields, older CMS uploaders, email signatures, plenty of design tools — they want a raster and will not take a vector. Some of that is inertia; some is deliberate, since an SVG is really a text file and can carry scripts.

So you rasterize. SVG to PNG draws your vector with the browser's own rendering engine and captures the result, entirely on your device. PNG is the right target for a logo: it keeps transparency, and it holds flat colour and hard edges without the fuzz JPG puts around them. SVG to JPG is there for when you want a small flattened preview and do not need transparency — JPG has no alpha channel at all, so transparent areas arrive filled solid white.

Export is a one-way door

Here is the part worth slowing down for. A vector has no inherent size, so rasterizing forces you to choose one — and that choice is frozen into the file permanently. That is the whole decision, which is why the tool puts a width control in front of you instead of guessing on your behalf.

Choose generously. You can always scale a PNG down cleanly; you can never meaningfully scale one up. If a logo will sit at 200px on the page, export it at 400px or more — high-DPI screens render at multiples of the nominal size, so a PNG exported at exactly its display size looks soft on any modern phone. Exporting large costs you nothing but file size, and compression handles that afterwards. Our guide on converting SVG to PNG walks through the decision properly.

Keep the SVG. It is the master file. The PNG is a disposable export for one destination, and treating the export as your logo is how organisations end up with a blurry wordmark and no way back.

Can you go the other way?

Not really, and not here. Turning a raster back into a vector is called tracing, and it is a genuinely different problem: the software has to stare at a grid of pixels and guess what shapes the person meant. It does a passable job on clean flat artwork and a poor one on photographs, and the output is an approximation rather than your original file. babapic's converters all produce raster formats — there is no PNG-to-SVG tool on this site, and anything advertising that conversion elsewhere is running a trace, whatever it calls itself.

Which is the practical takeaway: the SVG is the one thing you cannot regenerate. Do not lose it.

FAQ

Is SVG always better than PNG?
For logos, icons, and flat illustration, usually — one file, sharp everywhere. For photographs, no. A photo has no shapes to describe; it genuinely is a grid of pixels, and that is exactly what raster formats are built for.

Why does my exported PNG look blurry?
Almost always because it was exported too small and is being displayed larger. Go back to the SVG and export again at a greater width — enlarging the PNG you already have cannot recover detail it never stored.

Can I convert a PNG logo back to SVG?
Not on this site, and not losslessly anywhere. Tracing software can approximate the shapes, which may be good enough for simple flat artwork, but it will not reconstruct the original vector. Ask whoever made it for the source file.