How to Compress Images to Speed Up Your Website
Large images are the top reason web pages load slowly. Learn how compressing them boosts speed, SEO and user experience — for free.
If your website feels slow, images are usually the culprit. A single uncompressed photo can be several megabytes — heavier than all your text, code and fonts combined. Compressing images is the fastest win for a faster site.
Why image size matters so much
Page speed affects everything: visitors leave slow pages, and Google uses speed (Core Web Vitals) as a ranking factor. Smaller images mean faster loads, better SEO, lower bandwidth costs and happier users — especially on mobile networks.
How compression works
Compression reduces file size in two ways: lowering quality slightly (which is often invisible to the eye) and resizing the image to the dimensions it is actually displayed at. A 4000-pixel-wide photo shown in a 800-pixel column is wasting 80% of its data.
Compress images in your browser
You do not need Photoshop. A free image compressor lets you upload a JPG or PNG, adjust the quality and maximum width, and download a much smaller file — all locally in your browser, so your images are never uploaded to a server.
Practical tips
- Aim for under 200 KB for most web images.
- Resize to the largest size the image is actually shown at.
- Start at 70–80% quality and lower it until you notice a difference.
- Keep an original copy in case you need to re-edit later.
Do this for every image on your site and you will often cut total page weight in half — a change your visitors and your search rankings will both appreciate.