Why Is My SVG Blurry? Common Causes and Fixes

The most common cause: some tools produce an SVG file that just wraps a Base64-encoded PNG or JPEG inside an `<image>` tag rather than tracing real vector paths. It has an .svg extension, but it's still a raster image under the hood, so it blurs when scaled exactly like a PNG would. Open the file in a text editor — if you see a long Base64 string instead of `<path>` elements, that's your answer. See PNG vs SVG for why this distinction matters.

This happens more often than you'd expect, because a raster-wrapped file is technically a valid SVG — it opens fine, displays fine at its original size, and only reveals the problem once you scale it up or print it large.

Counterintuitively, tracing a low-quality or heavily compressed source image at very high detail can produce a huge number of tiny, jagged path segments that look rough rather than smooth — the trace is faithfully reproducing noise from the original file. Try re-tracing from a cleaner source image, or increase the smoothing setting so the algorithm favors fewer, smoother curves.

Some platforms (certain CMS image handlers, older browsers, or export settings in design tools) convert an SVG into a raster image at a fixed resolution before displaying it — at that point, it inherits all the scaling problems of a PNG. Check whether the platform you're using has an option to serve or embed SVG natively rather than converting it.

An SVG's `viewBox` attribute defines its internal coordinate system and how it scales when you resize it. If a file is missing a `viewBox` and only has fixed `width`/`height` attributes, resizing it in CSS can stretch or distort the vector content instead of scaling it cleanly — which can look like blurriness even though every path is still perfectly crisp underneath.

If a container forces an SVG into a width and height that don't match its original aspect ratio, the browser stretches the vector content to fit — which can make straight lines and curves look subtly warped or soft, especially at an angle. Setting `width: auto` or `height: auto` (keeping only one dimension fixed) usually resolves this, since it lets the browser scale proportionally instead of distorting the shape.