Image weight dominates page weight on most websites. Compression is the highest-leverage optimization available — and it's mostly a matter of picking sane defaults rather than micro-tuning.
Why it matters more than you think
A single unoptimized photo can outweigh an entire page of code. Every visitor pays for it — in load time, in mobile data, and in the ranking signals search engines derive from both. Compressing images from 4 MB to 200 KB is routine and changes how a page feels instantly.
Quality settings that work
- Photos: quality 75–85 is the sweet spot — visually indistinguishable from originals at normal viewing sizes.
- Below ~65, JPEG/WebP artifacts become visible in gradients and fine texture; avoid unless the target size demands it.
- PNG (screenshots, logos): compression is effectively lossless, so there's no quality trade-off — only smaller files.
Target-size mode for hard limits
Upload forms, email clients and CMS fields often impose hard limits: 100 KB, 200 KB, 1 MB. Instead of hand-tuning, target-size compression searches for the highest quality that fits under your number and reports exactly what it achieved. Pixitools' compressor offers both modes, with the achieved size shown before you download.
The format lever
Compression quality is the second lever. Format is the first: the same photo at the same quality can differ 3–5× between PNG and WebP. If you haven't chosen a format deliberately, read JPG vs PNG and WebP vs JPG, then convert once and compress after.
Try it with these tools
Related articles
Optimization
How to Reduce Image File Size Without Losing Too Much Quality
A practical order of operations: resize first, pick the right format, then compress with the right quality — with rules of thumb that hold up.
Read articleGuides
How to Resize Images for Websites
Which pixel widths actually matter on the modern web, why aspect ratio should stay locked, and how unit settings like DPI fit in.
Read articleEvery tool mentioned in this article runs entirely in your browser — see privacy for what that means.