About ToolLocker

A small, growing collection of free, single-purpose file tools that do one job well — and do it entirely in your browser.

Privacy by design. Every tool runs on your own device. Your files are never uploaded, stored, or seen by anyone. There are no accounts and no tracking.

What this is

Most online file tools ask you to upload your document to a server, sit through ads, or make an account for a task that should take ten seconds. ToolLocker takes the opposite approach: each tool is a single page that does one thing, loads fast, and processes your file locally using code that runs in your browser. Nothing leaves your device.

Why it exists

It started with a simple, real problem — turning a PDF into a proper fold-and-staple booklet without wrestling with a print dialog or trusting an upload site. That became the first tool. The plan is to keep adding small, practical utilities in the same spirit: focused, free, and private.

The tools

PDF Booklet Maker Reorders a PDF's pages for saddle-stitch printing, so a double-sided print folds and staples into a booklet that reads in order. Binding gutter, crop marks, and clear print instructions included.
PDF N-up Maker Tiles 2, 4, 6, 9, or 16 PDF pages onto a single sheet — handy for handouts, proofs, and saving paper.

How it's built

The tools are plain, static web pages using the open-source libraries pdf-lib and pdf.js, hosted on Cloudflare. There is no backend and no database — which is exactly why your files can't be uploaded or stored. If you're curious, you can watch your browser's Network tab while using a tool and confirm nothing is sent.

Get in touch

Found a bug, or have an idea for a tool? See the Contact page — feedback is welcome.