# Responsive Images


# Responsive srcset

The thumbnail uses a responsive `srcset` so the browser picks the best size for the viewport. When clicked, the lightbox loads the highest- resolution source automatically.


<img src="images/chart-400.svg" class="gd-lightbox-img" srcset="images/chart-400.svg 400w, images/chart-800.svg 800w, images/chart-1600.svg 1600w" sizes="(max-width: 600px) 400px, 800px" loading="lazy" alt="Revenue Chart" />

![](data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTYiIGhlaWdodD0iMTYiIHZpZXdib3g9IjAgMCAyNCAyNCIgZmlsbD0ibm9uZSIgc3Ryb2tlPSJjdXJyZW50Q29sb3IiIHN0cm9rZS13aWR0aD0iMiIgc3Ryb2tlLWxpbmVjYXA9InJvdW5kIiBzdHJva2UtbGluZWpvaW49InJvdW5kIj48cG9seWxpbmUgcG9pbnRzPSIxNSAzIDIxIDMgMjEgOSI+PC9wb2x5bGluZT48cG9seWxpbmUgcG9pbnRzPSI5IDIxIDMgMjEgMyAxNSI+PC9wb2x5bGluZT48bGluZSB4MT0iMjEiIHkxPSIzIiB4Mj0iMTQiIHkyPSIxMCI+PC9saW5lPjxsaW5lIHgxPSIzIiB5MT0iMjEiIHgyPSIxMCIgeTI9IjE0Ij48L2xpbmU+PC9zdmc+)


# Explicit full-src Override

Use `full-src` to point the lightbox at a specific high-res file regardless of what `srcset` contains:


<img src="images/diagram.svg" class="gd-lightbox-img" loading="lazy" alt="Architecture Diagram" />

![](data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTYiIGhlaWdodD0iMTYiIHZpZXdib3g9IjAgMCAyNCAyNCIgZmlsbD0ibm9uZSIgc3Ryb2tlPSJjdXJyZW50Q29sb3IiIHN0cm9rZS13aWR0aD0iMiIgc3Ryb2tlLWxpbmVjYXA9InJvdW5kIiBzdHJva2UtbGluZWpvaW49InJvdW5kIj48cG9seWxpbmUgcG9pbnRzPSIxNSAzIDIxIDMgMjEgOSI+PC9wb2x5bGluZT48cG9seWxpbmUgcG9pbnRzPSI5IDIxIDMgMjEgMyAxNSI+PC9wb2x5bGluZT48bGluZSB4MT0iMjEiIHkxPSIzIiB4Mj0iMTQiIHkyPSIxMCI+PC9saW5lPjxsaW5lIHgxPSIzIiB5MT0iMjEiIHgyPSIxMCIgeTI9IjE0Ij48L2xpbmU+PC9zdmc+)


# Srcset with Dark Mode

Responsive images can also combine with dark-mode variants. The lightbox will prefer the dark variant when in dark mode:


<img src="images/dashboard.light.svg" class="gd-lightbox-img" srcset="images/dashboard.light.svg 700w" loading="lazy" alt="Dashboard" />

![](data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMTYiIGhlaWdodD0iMTYiIHZpZXdib3g9IjAgMCAyNCAyNCIgZmlsbD0ibm9uZSIgc3Ryb2tlPSJjdXJyZW50Q29sb3IiIHN0cm9rZS13aWR0aD0iMiIgc3Ryb2tlLWxpbmVjYXA9InJvdW5kIiBzdHJva2UtbGluZWpvaW49InJvdW5kIj48cG9seWxpbmUgcG9pbnRzPSIxNSAzIDIxIDMgMjEgOSI+PC9wb2x5bGluZT48cG9seWxpbmUgcG9pbnRzPSI5IDIxIDMgMjEgMyAxNSI+PC9wb2x5bGluZT48bGluZSB4MT0iMjEiIHkxPSIzIiB4Mj0iMTQiIHkyPSIxMCI+PC9saW5lPjxsaW5lIHgxPSIzIiB5MT0iMjEiIHgyPSIxMCIgeTI9IjE0Ij48L2xpbmU+PC9zdmc+)