How Foldr works

The short version: your files never leave your device. Here's the longer, more specific version, because "we take privacy seriously" is a claim worth backing up with actual mechanics.

Processing happens in your browser tab

Every tool on Foldr — merging, splitting, compressing, converting, watermarking — is built on WebAssembly libraries (pdf-lib and pdf.js) that run directly inside the JavaScript engine of your browser tab. When you drop a file into a tool, it's read into local browser memory with the File API. It is not sent over the network to any server for processing.

You can verify this yourself

Open your browser's developer tools, switch to the Network tab, and run any tool on a file. Aside from the initial page load, you won't see the file itself being transmitted anywhere. Once the page and its scripts have loaded, most tools continue to work with your network connection turned off.

Nothing is stored after you're done

Files exist only in your browser's working memory for the duration of the operation. There's no database, no file storage bucket, and no account system holding onto your documents. Close the tab and the data is gone — because it was never written down anywhere to begin with.

What we do collect

Like most websites, Foldr may use basic, aggregate analytics (such as page views) to understand which tools are useful and to fix bugs. This is standard web analytics and is unrelated to — and has no access to — the contents of files you process with the tools.