Images are usually the heaviest thing on a web page — often bigger than all the text, code and styling combined. That makes them the number-one cause of slow-loading sites. And slow sites cost you: visitors leave, and search engines rank you lower. The fix is simple and free: compress your images before you upload them. Here's how to do it properly.

Step 1: Resize before you compress

The most common mistake is uploading a photo straight from a phone or camera — often 4,000 pixels wide or more — when it will only ever be displayed at, say, 1,200 pixels. All those extra pixels are wasted weight. Before anything else, resize the image so its width matches how it will actually appear. A blog's main content area is often around 800–1,200 pixels wide; a full-width banner might be 1,600–1,920.

Step 2: Choose the right format

• JPG — best for photographs. It compresses smoothly and gives small files.
• WebP — a modern format that usually beats JPG at the same quality. Every current browser supports it, so it's a safe default for the web.
• PNG — best for graphics with sharp edges, text, or transparency (like logos). For photos, PNG files are large, so convert them to JPG or WebP.

If you're unsure, try WebP first; if you need maximum compatibility with very old software, use JPG.

Step 3: Pick a sensible quality level

Compression is a trade-off between file size and visual quality. The good news is that you can usually drop a lot of quality before the human eye notices. For most web photos, a quality setting of 70–85% hits the sweet spot: the file shrinks dramatically while the image still looks great. Below about 60% you'll start to see blockiness, so use that only when size matters more than looks.

Step 4: Check the savings

A good compressor shows you the before-and-after file size so you can see exactly what you've saved. It's not unusual to take a 3–4 MB photo down to 150–300 KB — a 90%+ reduction — with no visible loss. Multiply that across every image on a page and your load time can drop from seconds to milliseconds.

Our free image compressor does all of this in your browser: drop in a JPG, PNG or WebP, set a max width, drag the quality slider, and watch the savings update live before you download. Nothing is uploaded, so it's fast and private.

A quick checklist

• Resize to the real display width first.
• Use WebP (or JPG) for photos, PNG for graphics with transparency.
• Aim for 70–85% quality.
• Confirm the file is well under a few hundred KB where possible.

Do this for every image and your site will feel noticeably snappier — for your visitors and for search engines alike.