How do I fix a giant, blurry, or pixelated header logo on mobile devices?

Blurry mobile logos occur when your theme template lacks an explicit retina-display image variant, forcing standard-resolution images to stretch across dense pixel viewports, or when hardcoded CSS dimensions distort the aspect ratio.

“The usual culprit is a missing retina-resolution image, so a standard image gets stretched across a dense phone screen. I’ll get a proper variant in place within 24 hours for $99.”
— Jeff Bollettino, Managing Director, Ignite Conversions