Images account for more than 60% of the total page weight on modern web pages. Optimizing them is the single highest-impact change you can make to pass Google's Core Web Vitals (LCP, CLS, and INP).
1. Choose the Right Modern Format (WebP & AVIF)
Legacy formats like JPEG and PNG are bloated. By converting your images into WebP or AVIF, you achieve 30% to 50% file size reduction with zero perceptible quality degradation. With FlipMyTools Image Converter and Compressor, you can batch convert images directly in your browser without uploading files to any server.
2. Use Explicit Width and Height Attributes
Cumulative Layout Shift (CLS) occurs when elements jump as images load asynchronously. Always define explicit dimensions or use CSS aspect-ratio properties so the browser reserves layout space before download completes.
"Fast image delivery directly correlates with higher search rankings, lower bounce rates, and increased conversion rates."
3. Implement Native Lazy Loading
By adding loading="lazy" to images below the fold, browsers defer downloading them until the user scrolls close to their viewport position. Never lazy load your hero or LCP banner!
Summary Checklist
- Convert all PNG/JPEG banners to WebP or AVIF.
- Compress images to target under 100KB per full-width banner.
- Set explicit width and height on every <img> tag.
- Use client-side tools like FlipMyTools for safe, private compression.