How to compress images without losing quality
Large images are the number one reason web pages feel slow. Compressing them cuts file size — and load time — without a visible drop in quality if you pick the right format and settings.
Lossy vs lossless compression
Lossy compression (JPG, WebP) permanently discards some detail to shrink a file dramatically. At quality settings between 75 and 85 the difference is invisible on screen but the savings are 50–80%. Lossless compression (PNG, lossless WebP) preserves every pixel and gives a smaller, safer win.
The right choice depends on the content. Photographs and gradients tolerate lossy compression well. Screenshots, logos, text and flat colours look blurry or banded when compressed too hard, so keep them lossless or use a high quality setting.
How to compress an image with FreetoolsY
Open the Image Compressor, drop in your JPG, PNG or WebP file and choose a quality level. Everything runs locally in your browser using the Canvas API, so your file never leaves your device.
- Drag and drop one or more images into the tool.
- Pick a quality setting — around 80% is a good starting point.
- Download the compressed file and compare the size before and after.
Resize before you compress
Compression only removes so much. If you are serving a 4000px image to a phone, resizing it to roughly twice the display size first saves more than any quality slider. Use the Image Resizer to scale down, then the Image Compressor to optimise the result.
Finally, choose a modern format. Converting to WebP with the Image Converter typically gives 25–35% smaller files than JPG at the same visual quality, and every current browser supports it.