How to Reduce Image File Size Without Losing Quality
Shrink JPG, PNG and WebP images for websites, email and uploads — what actually controls image size, and how to compress without visible quality loss.
What actually makes an image heavy
Two things: dimensions (a 4000×3000 phone photo has 12 million pixels) and encoding quality. A photo destined for a web page rarely needs to be wider than 1600 pixels — resizing alone often cuts the file by 80% before any compression is applied.
The two-step shrink
Resize first: open the Image Resizer and scale the image to the size it will actually be displayed at (e.g. 1200 px wide for a blog, 800 px for email).
Then compress: run the resized image through the Compress File tool, or convert it to WebP with the Image Converter — WebP is typically 25–35% smaller than JPG at the same visual quality.
Which format to pick
Photos: JPG or WebP. Screenshots and graphics with text: PNG (or WebP) — JPG makes text edges fuzzy. Transparency: PNG or WebP only; JPG has no transparency and will fill it with white.
Quality settings that are safe
For photos, 70–80% quality is visually indistinguishable from the original for most uses while cutting the size dramatically. Go lower only for thumbnails. Everything here runs in your browser, so your photos are never uploaded to a server.