Comparison
SVG vs PNG: which should you use?
The two formats solve different problems. SVG describes shapes with coordinates and curves; PNG stores a fixed grid of pixels. Here is how they compare on scaling, size, transparency, and editing — and a simple rule for picking one.
Use SVG for anything made of shapes — logos, icons, diagrams, charts, illustrations — and PNG for anything made of pixels that needs an exact alpha channel, most often screenshots and photographic cut-outs. The difference is not quality or file size in the abstract; it is what the two formats store. SVG stores instructions for drawing shapes. PNG stores a fixed grid of colored pixels.
What each format actually stores
A PNG is a raster image: a grid with a color and an opacity value for every pixel, losslessly compressed. Whatever resolution it was exported at is the resolution it has forever. Displaying it larger means the renderer has to invent the pixels in between, which is why an upscaled PNG looks soft.
An SVG is a text document in XML. It contains elements such as <path>, <circle>, and <rect>, each described by coordinates, curves, fills, and strokes. Nothing in the file is tied to a pixel size, so the renderer draws it fresh at whatever size and pixel density it is asked for.
Scaling
This is the decisive difference for interface work. One SVG renders identically at 16 pixels in a tab, 24 in a toolbar, and 512 in a marketing page, on a standard display and on a 3x retina one. The PNG equivalent is exporting the same icon three times and shipping all of them, then doing it again the next time a design changes.
The exception is small-size hinting. A hand-drawn 16-pixel PNG icon, where the designer placed every pixel deliberately, can still look crisper than an SVG scaled down to the same box. That gap has narrowed a lot but it has not closed entirely.
File size
There is no general winner here, only a rule about content. SVG size scales with the number of distinct shapes in the image; PNG size scales with the number of pixels and how much they vary.
- Flat icon — often a few hundred bytes as SVG, a few kilobytes as PNG, and the PNG only covers one size.
- Detailed illustration — roughly comparable, depending on how many separate regions the artwork contains.
- Photograph — PNG wins decisively. A traced photograph becomes tens of thousands of small paths, which is exactly the situation described in why is my SVG file so large.
One structural advantage worth remembering: SVG is plain text, so gzip or Brotli typically removes 60 to 80 percent of it in transit. PNG is already compressed and gains almost nothing from a second pass.
Transparency
Both formats handle it, differently. PNG carries a full 8-bit alpha channel, so every pixel has its own opacity — which is what makes it the right format for a soft-edged cut-out or a drop shadow baked into the image. In an SVG, any area you did not draw is simply empty, and individual elements can carry their own opacity.
Practical caveat for conversions here: tracing flattens transparency. A PNG with an alpha channel comes out of the PNG to SVG converter composited against whatever background it had, so prepare the source against the background you want before converting.
Editing and styling
Because an SVG is markup, everything in it is addressable. You can restyle a fill with CSS, animate a path, swap colors for dark mode, or hand-edit a coordinate in a text editor. An inline SVG in a page can inherit currentColor, so one icon file adapts to every context it is used in.
A PNG is opaque to all of that. Changing a color means going back to the original artwork and re-exporting, which is why icon systems that ship PNGs accumulate near-duplicate files: one per color, per size, per density.
Support and edge cases
Both formats are universally supported in browsers, and have been for many years. The differences show up outside the browser:
- Email — several major clients still do not render SVG. Ship PNG in email.
- CMS and upload filters — some reject SVG uploads on security grounds.
- Security — SVG is markup and can contain scripts, so files from untrusted sources must be sanitized before being served inline. PNG has no equivalent risk.
- Print and office software — modern versions handle SVG; older ones do not.
The rule
Ask what the image is made of. If it is shapes — flat colors, clear boundaries, a countable number of regions — SVG is the right target, and you can trace an existing PNG into one. If it is a photograph or a screenshot, keep it raster; for the web, a well-compressed WebP or AVIF will beat PNG on size while keeping the same pixel fidelity. And whichever way you go, remember that renaming the file extension converts nothing: the two formats have no common structure, so getting from PNG to SVG requires tracing.
Where to convert
The converters that put this guide into practice:
- PNG to SVG converter — Trace PNG icons and UI graphics into vector paths when you decide SVG is the right target.
- JPG to SVG converter — The same comparison applies to JPG, with lossy compression artifacts added to the picture.
- WebP to SVG converter — For images saved from modern sites, where the source is neither PNG nor JPG.
Where can I read more?
The output is standard SVG markup, defined by the following public specifications and references: