What is PhotoToolKit?
PhotoToolKit is a free, browser-based image compression tool that lets you compress JPG, PNG and WebP images to a specific file size — such as 20 KB, 50 KB, 100 KB, 200 KB or 500 KB. Images are processed locally in your browser and are never uploaded or stored. PhotoToolKit also supports bulk compression with ZIP downloads. No registration is required, and the tool is completely ad-free.
PhotoToolKit is a small, focused tool: pick a target file size, drop in a photo, and get exactly that — compressed entirely in your own browser.
It exists because "compress my photo to under 50 KB for this form" is a surprisingly common, surprisingly annoying task — and most tools that solve it ask you to upload your photo to a stranger's server first. This one doesn't.
How it works, briefly
Your browser already has everything needed to resize and re-encode an image — the same technology behind the canvas element used in web graphics and games. This site simply automates that: it tries different quality and size combinations until your photo fits your target, then hands you the result. At no point does the image leave your device.
A note on this being an early release
This is a first, focused version. If something doesn't work the way you expect, we'd like to hear about it — see the Contact page.