About shrink.run

A small set of free file tools that run entirely inside your browser.

What this site is

shrink.run is a collection of everyday file tools: compressing, converting and resizing images, and merging or splitting PDFs. There is nothing to install and nothing to sign up for — you open a tool page, pick a file, and get the result back.

How it works

The image and PDF engines are compiled to WebAssembly and shipped to your browser along with the page. When you pick a file, your own device does the work — the browser reads the file, runs the codec locally, and hands you the result. Nothing is uploaded to a server. There is no server-side processing on this site at all, so there is no upload queue, no “your file will be deleted in 24 hours” promise to take on trust, and no file-size tier to buy your way past. The practical limit is your device's memory, not our disk space.

A side effect worth knowing: the first run of a tool downloads its WebAssembly module, so it can take a moment. After that everything is local and fast, and the tools keep working even if you lose your connection.

You do not have to take any of that on faith: how it works explains the whole chain in plain language and shows you how to verify it in your own browser.

Why it is free

Because your device does the work, running this site costs close to nothing: it is static pages on a CDN. That leaves ads as the only thing we need to cover hosting and the domain — no accounts, no subscriptions, no paid tiers. See the privacy policy for what data the site and its ad provider handle, and the terms of use for the ground rules.

The tools