How to compress images without visible quality loss
Reduce image file size without making photographs, screenshots or web graphics look obviously damaged.
Image compression works best when you remove what the viewer cannot use. An oversized photo displayed in a small card wastes bytes; a screenshot saved with heavy photo compression can make text look dirty. The right settings depend on the picture.
Key takeaways
- Resize oversized images before lowering quality.
- Judge the result at the size people will actually see.
- Choose a format that suits the image, not just the smallest file.
Start with dimensions
Check the maximum width the image will occupy. A 4000-pixel camera image rarely needs to stay that large when it will appear in an 800-pixel article column.
Match the format to the content
JPG works well for photographs, PNG preserves transparency and crisp flat graphics, and WebP often provides a useful balance for the web.
Lower quality in small steps
Begin around a high-quality setting, download a test, and compare fine detail. Hair, foliage, gradients and small text tend to reveal compression damage first.
Compare file size and appearance
The smallest file is not automatically the best result. Stop when another reduction produces a visible downside that is not worth the saved bytes.
Keep the original
Compression is usually a one-way decision. Archive the full-quality source and use the smaller copy for the website, message or form that needs it.
Final check
A well-compressed image should look ordinary to the viewer and feel noticeably lighter to the page or message that carries it.