How to Compress Images Without Losing Quality

Big images slow down websites, clog up email attachments, and eat storage. The good news: you can usually cut an image's file size by 60–80% without anyone noticing a difference. Here is how compression actually works and how to get the best results.

Lossy vs Lossless Compression

Lossless compression (used by PNG) rearranges data more efficiently without throwing anything away. The image stays pixel-perfect, but savings are modest. Lossy compression (used by JPG and WEBP) permanently removes detail your eyes barely register — and that is where the big wins come from.

The Quality Slider Is Your Friend

Most tools let you pick a quality level between 0 and 100. In practice, 70–85 is the sweet spot for photos: files shrink dramatically while staying visually identical at normal viewing sizes. Below 60 you start to see blocky artifacts around edges and text.

Resize Before You Compress

A 4000-pixel-wide photo displayed at 800 pixels wastes enormous bandwidth. Always resize to the dimensions you actually need first, then compress. Combining both steps routinely turns a 5 MB photo into a 150 KB file.

Pick the Right Format

• JPG: best for photographs and complex gradients
• PNG: best for screenshots, logos, and images needing transparency
• WEBP: modern format that beats both in size, supported by all current browsers

Keep Your Originals

Lossy compression is one-way. Always keep the original file somewhere safe so you can re-export at different settings later.

Our compressor runs entirely in your browser — your images never leave your device, and you can compress a whole batch and download it as a ZIP in one click.