Browser-side compression
Image optimizer.
Drag-and-drop your images, adjust quality and format settings, then download optimised assets instantly. Everything runs locally in your browser — no files are ever uploaded to a server.
Image compressor
Compression Settings
How the compressor works
Faster pages
Images account for ~50% of page weight. Compressing them is the single highest-impact optimisation for Core Web Vitals scores.
100% private
Uses browser-native Canvas API. Your files never leave your device — no server, no cloud, no third-party access.
WebP by default
WebP delivers 25–35% better compression than JPEG at equivalent visual quality. Supported by all modern browsers since 2020.
How to use it
Getting a useful result.
- Drag in one image or a whole folder. Nothing is uploaded — the compression runs in your own browser, so large batches are limited only by your machine.
- Leave the format on WebP unless you need transparency in an old browser. It is typically 25–35% smaller than JPEG at the same visible quality.
- Start at quality 75 and look at the preview. Photographs survive heavy compression; flat graphics, screenshots and anything with text need a higher setting or they go blotchy.
- Check the size before and after. For a photo on a normal web page, anything under about 150KB is a good result.
- Download, then replace the original on your site. Compressing the file does nothing until the page actually serves the new one.
The usual cause of a slow page is a photo straight off a phone camera: 4,000 pixels wide and three or four megabytes, displayed in a box 600 pixels across. The browser downloads every one of those pixels and then throws most of them away. Resizing to roughly the size it is displayed at saves more than any quality slider.
Two settings do different jobs. Resizing reduces the pixel dimensions and is almost always safe. Quality discards detail within those pixels and is where visible damage happens, so change one at a time and judge the preview at full size, not the thumbnail.
Once your images are in order, the PageSpeed auditor will tell you what is next — usually fonts or scripts.
Common questions
Are my images uploaded anywhere?
No. The work is done by your browser's own canvas, so the files never leave your device. That also means it keeps working with your connection dropped, and there is nothing for us to store, see or delete.
Should I use WebP, JPEG or PNG?
WebP for almost everything — every browser has supported it since 2020. JPEG if a specific old system rejects WebP. PNG only for images that need sharp edges and transparency, like a logo; for photographs PNG produces enormous files for no visible benefit.
Will compressing make my images look bad?
At sensible settings, no — you generally cannot tell a quality-75 WebP photograph from the original on a screen. Damage shows first on flat colour, gradients, screenshots and text, so raise the quality for those and keep it lower for photographs.
Heavy images are the most common reason a good-looking site loses its visitors on a phone — web development.