SVG vs PNG: Which Format Should Your Website Actually Use?

SVG and PNG are not competing answers to the same question. SVG describes shapes, curves, fills, and text as instructions. PNG stores a fixed grid of colored pixels. A website normally needs both: a vector master for artwork that should scale, plus raster exports for platforms that require a fixed canvas.

The costly mistake is choosing by habit. A PNG logo may look fine in a 180-pixel header but turn soft on a high-density display. An automatically traced SVG may scale forever yet contain thousands of noisy paths, render more slowly, and be painful to edit. Choose from the content and destination, not the extension.

Decision matrix

Where SVG wins cleanly

A simple logo made from a few solid shapes is the ideal SVG. The browser can draw it at 24 pixels, 240 pixels, or the width of a display without inventing intermediate pixels. One file can serve standard and high-density screens, so responsive CSS changes its rendered size rather than requesting separate 1× and 2× assets.

SVG also works well when the mark should follow the surrounding theme. An inline SVG whose fills use currentColor inherits the CSS text color:

.brand-mark { color: #111827; width: 8rem; }
.dark .brand-mark { color: #f9fafb; }

That technique is appropriate for monochrome artwork. Do not replace every fill with currentColor in a multicolor logo; doing so destroys the intended palette. A safer transformation changes only neutral black or white shapes and leaves brand colors alone.

Where PNG wins cleanly

PNG is the dependable choice when every pixel matters: soft shadows, glows, grain, complex transparency, screenshots, and artwork with photographic detail. Those effects can be represented in SVG, but the result is often heavier or less portable than a well-sized raster image. PNG is also lossless, so hard edges and transparent backgrounds avoid the ringing and blocks that lossy JPEG compression can create.

For a raster logo displayed at 240×80 CSS pixels, export at least 480×160 for a 2× device-density source. Set the HTML or CSS display size to 240×80. The larger source does not make the logo physically larger; it gives a high-density screen enough pixels. A 3× export can help native mobile surfaces, but it rarely repairs a poor original.

File size is content-dependent

“SVG is smaller” is a useful tendency, not a law. A six-shape wordmark may compress into a tiny SVG while a 2× transparent PNG needs far more bytes. A traced watercolor can invert that result: thousands of paths and colors may make the SVG larger than the PNG and harder for the browser to paint.

Compare production files, not editor sources. Optimize the SVG, remove hidden layers and metadata, rasterize the PNG at its real maximum display size, then compress both. Check transfer size after Brotli or gzip for SVG and the actual image bytes for PNG. Keep the version that is visually correct and operationally simpler.

Three SVG gotchas

1. An SVG can hide a bitmap. Open the file and look for an <image> element or a large base64 payload. That wrapper still contains pixels and will not gain true vector sharpness.
2. Inline SVG is active markup. Treat an SVG from an untrusted source as input to sanitize. Script, event attributes, links, and external references do not belong in a logo asset. SVG loaded as an image has tighter browser restrictions than inline markup, but sanitizing at ingestion remains the sound workflow.
3. Fonts can change. A logo that relies on a font installed on the designer’s computer may render differently elsewhere. Convert final lettering to paths after saving an editable source copy.

A practical production workflow

Keep one reviewed SVG as the master for a shape-based logo. Preserve the original colors, viewBox, and editable source. Generate a monochrome or currentColor variant only when the design supports it. From that master, export PNG derivatives for touch icons, manifests, app stores, email signatures, and social cards.

If the only source is a small PNG, inspect it before tracing. Flat colors, strong contrast, and clean edges are good candidates for PNG-to-SVG conversion. Photos, heavy gradients, or compression damage are not. Trace, zoom in on corners and holes, reduce noise, and compare the result at the smallest real display size. Scaling is valuable only when the shapes are faithful.