Compress Images Without Visible Quality Loss

Start with dimensions

A camera photo can be several thousand pixels wide even when a website displays it at a fraction of that size. Reducing unnecessary dimensions often saves more space than aggressive quality reduction and usually looks cleaner.

Keep a separate original. Work from that source each time instead of compressing an already compressed copy again.

Choose a sensible format

• JPG suits photographs and images with gradual colour changes.
• PNG suits sharp interface graphics and images that need transparency.
• WebP can provide smaller web files for photographs and graphics in modern browsers.

Converting a simple JPG to PNG often makes the file larger. Converting transparency to JPG replaces transparent areas with a solid background.

Find the quality threshold

1. Set the target dimensions.
2. Export at a moderate quality such as 80 to 85.
3. Compare faces, text, edges and smooth gradients.
4. Lower quality in small steps only if more saving is needed.
5. Stop when artifacts become noticeable at normal viewing size.

Measure the real saving

Record the original size, output size and pixel dimensions. A percentage saving is useful, but page performance also depends on how the image is loaded. Use responsive image sizes, lazy loading where appropriate and correct width and height attributes.

Watch for common damage

Heavy compression can create blocks around text, halos along edges and bands in skies or gradients. Repeated exporting makes this worse. If the result looks poor, return to the original, reduce dimensions carefully and export once.