How to compress images without visible quality loss

Most images on the web are 3–10× larger than they need to be. The savings rarely come from shaving quality — they come from choosing the right format and the right dimensions.

Start with dimensions, not quality

A 4000 px photo displayed at 800 px is wasting 96% of its pixels. Resize first (longest side 1600–2000 px is plenty for full-width web images), then compress. That single step usually beats any quality slider.

Pick the format by job

• JPG — photos, print, ad platforms. Quality 75–82 is the point where you stop seeing a difference in normal viewing.
• WebP — websites. Typically 25–35% smaller than JPG at the same visual quality, and it supports transparency.
• PNG — screenshots, logos, anything with sharp edges or transparency. Do not use it for photos.
• AVIF — the smallest option, roughly 20–30% under WebP, but slower to encode and unsupported by older browsers.

Where to stop

Below about quality 60 you start to see blocking in skies, skin and smooth gradients. Stay at 70+ for faces and product shots. For dark backgrounds with gradients, bump it back to 80 — banding shows up there first.

The practical recipe

1. Resize so the longest side is 1600–2000 px.
2. Compress at quality 78.
3. Look at the result at 100% on the area you care about (faces, text, product edges).
4. If it looks identical, keep it. If not, go up 6 points and repeat.

That is it — no dark magic, and no need to keep a 12 MB original in a product page.

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