How to Compress Images Without Losing Visible Quality

Last year I built a photography portfolio. Beautiful images, terrible performance. Google PageSpeed gave me a score of 23. The main culprit: unoptimized images.

Here's what I learned about compression — and how to do it without ruining your photos.

Understanding What "Quality Loss" Actually Means

JPEG compression is "lossy" — it throws away data that the human eye can barely perceive. At quality level 85, a photo looks virtually identical to the original but is often 60-70% smaller in file size.

PNG compression is "lossless" by default, but you can convert PNGs to WebP and get dramatic size reductions with zero visible quality loss.

The Simple Rule of Thumb

For photos: Use quality 80-85%. You won't see the difference at normal viewing distance.

For icons and logos: Keep PNG or use SVG. Never compress logos with JPEG — the artifacts on sharp edges are visible.

For screenshots: Try WebP format. It handles text and graphics well.

How to Compress Images on This Site

1. Open the Image Compress tool

2. Upload your file (JPEG, PNG, or WebP)

3. Drag the quality slider — preview updates in real time

4. Compare before/after with the toggle

5. Download when you're happy

The preview lets you catch obvious quality issues before you commit.

What I Actually Do Now

For my portfolio:

Google PageSpeed went from 23 to 91.

One Thing People Get Wrong

Compressing an already-compressed JPEG is a mistake. Every round of JPEG compression adds artifacts. Always start from the original file, not a previously compressed version.

The Before/After Test

Always do a visual comparison after compressing. Zoom in to 100% on areas with fine detail (hair, fabric, text). If it looks fine at 100%, it looks fine everywhere.