Practical Checklist for Optimizing Blog Images in HTML for Performance

The article argues that blog images can clarify complex ideas quickly but can also become the heaviest resource on a page, so optimization requires deliberate choices. It advises first asking what each image contributes, with screenshots needing to show only relevant interface and diagrams explaining relationships better than text. For screenshots, it recommends cropping to the relevant window, removing sensitive data, and keeping labels legible at display size, while warning that found images need verified reuse permission. It recommends matching file formats to content, such as PNG for exact-detail graphics, SVG for vector art, and WebP or AVIF for photographs, and generating multiple resized variants instead of a single size. Finally, it explains using srcset and sizes attributes so browsers can select appropriate files, while treating above-the-fold hero images differently to avoid lazy loading them.