How to Reduce an Image's File Size Without Visible Quality Loss
A photo straight from a phone is often 3–5 MB and 4,000 pixels wide. For a website, an email or a form, that's ten times more than needed. Two steps fix it: resize, then compress.
Step 1: resize to the size it will be shown
A screen rarely shows an image wider than 1,600–2,000 pixels; a blog column is often 800–1,200. Halving the width cuts the number of pixels — and roughly the file size — by four. In the image compressor, set a maximum width; the image keeps its proportions and is never enlarged.
Step 2: compress with the right format
- WebP: the best choice for websites. Supported by all modern browsers and typically much smaller than JPG at the same visual quality.
- JPG: the safe choice when you don't know what software will open the file (email attachments, government forms).
- PNG: for screenshots, logos and graphics with sharp edges or transparency. It's lossless, so the quality slider doesn't apply — convert photos to WebP or JPG instead.
Settings that work
| Use | Max width | Format & quality |
|---|---|---|
| Blog or website photo | 1,600 px | WebP, 75–85% |
| Email attachment | 1,600–2,000 px | JPG, 80% |
| Upload form with a size limit | 1,200 px | JPG, 70% |
A 4 MB phone photo commonly ends up under 300 KB with no difference visible at normal size. The tool shows before and after sizes so you can adjust.
Privacy
Compression runs on your device using the browser's built-in image engine; nothing is uploaded. Photos from an iPhone in .HEIC format need converting first with HEIC to JPG.