Does image size affect SEO?

Indirectly, yes: large images slow down loading, which hurts user experience and Core Web Vitals.

For blog images, 1200–1600 pixels wide and 100–200 KB is often enough.

How to Reduce Image Size for a Website

1. Do not upload more than you need

If an image is shown at 800 pixels wide at most, uploading a 4000-pixel original wastes bandwidth. For retina screens 2× is enough. Use the resize tool to shrink in bulk.

2. Choose an efficient format

For photos WebP or AVIF produce smaller files than JPG. See What is WebP?

3. Tune the quality

For most photos a quality of 75–85 saves a lot without a visible difference. The compression tool supports both quality and a target KB limit.

4. Strip metadata

EXIF data carries camera, date and location information; it enlarges the file and is a privacy risk. The tools on this site always remove metadata from the output.

5. Help the browser

Write width and height attributes (prevents layout shift).
Add loading="lazy" to images below the fold.
Do not lazy-load the largest image on the page (LCP); prioritise it.