How to compress images for a website without losing quality
Image compression reduces file size so your website loads faster without visible quality loss. Learn the best approach for JPG and PNG files.
Why image compression matters for websites
Images are typically the largest files on any webpage. An uncompressed hero image can be 3–5 MB, while a properly compressed version delivers the same visual quality at 200–400 KB. This difference directly affects page load time, Core Web Vitals, and bounce rate. Google uses page speed as a ranking factor, so compressing images is one of the most impactful SEO improvements you can make.
Lossy vs lossless compression
Lossy compression permanently removes some image data to achieve smaller files. The quality reduction is often invisible at 75–85% quality settings. JPG uses lossy compression by default. Lossless compression reduces file size without removing any data — PNG supports lossless compression. For web use, lossy compression at 75–85% quality is recommended for most images.
Best quality settings for common use cases
- Hero banner images: 80–85% quality
- Blog post images: 75–80% quality
- Product thumbnails: 70–75% quality
- Background textures: 65–70% quality
JPG vs PNG — which to compress
Use JPG for photographs and images with many colors and gradients. Use PNG for graphics with sharp edges, text overlays, screenshots, and images that require transparency. Converting a PNG photograph to JPG before compressing often saves 60–70% of file size.
How to compress images using Smartweb.tools
Open the Image Compressor tool, upload your JPG or PNG file, adjust the quality slider to your preferred level, and click Process to download the compressed version. The tool shows the output file size so you can find the best balance for your needs.