How to compress images without losing quality (free, in your browser)

Why image size matters

Large images slow down web pages, bounce off email attachment limits and eat phone storage. Google's own guidance lists properly sized, efficiently encoded images as one of the easiest ways to make a page load faster.

The good news: most photos can lose 50–80% of their file size with no difference you can see on screen.

Step 1: Resize before you compress

A photo straight from a phone is often 4000 pixels wide. Most websites and emails never show an image wider than 1200–2000 pixels. Resizing first gives the biggest saving. Use our free Image Resizer at /tools/image-resizer and keep "Keep proportions" switched on so nothing looks stretched.

Step 2: Pick the right format

JPG is best for photos. PNG is best for screenshots, logos and anything with sharp edges or transparency. WebP is a modern format supported by all major browsers that is usually smaller than both. Our Image Converter at /tools/image-converter switches between them.

Step 3: Choose a quality between 60% and 80%

Open the Image Compressor at /tools/image-compressor, drop in your images and start at 70% quality. Zoom in on a detailed area such as hair or text. If you can't see blocky artefacts, try going lower; if you can, go higher.

You can select many images at once — the tool processes them together and downloads them as one ZIP file.

Privacy tip

Many online compressors upload your photos to a server. ToolGrid AI's tools run entirely in your browser, so your images never leave your device.

Quick checklist

Resize to the largest size you actually need. Use JPG or WebP for photos. Start at 70% quality. Compare before and after at 100% zoom. Keep the original file in case you need it later.