PDF tools — merge and split in your browser

PDFs are the format of last resort: a document so frozen that nobody can edit it without a heavy desktop tool. The most common PDF chores are also the most annoying — combining a few files into one, splitting a long file into chapters, extracting a single page. Every "free PDF merger" on the web wants you to upload your contracts, invoices, and tax documents to a server you have never heard of, then opt into a newsletter to download the result.

These PDF tools run entirely in your browser. The `pdf-lib` library parses, modifies, and re-encodes your files locally on your CPU. Nothing is uploaded, nothing is logged, nothing leaves your device. The same scanned contract you would never email to a stranger's converter sits in this tab for as long as you need it — and closes with the tab.

PDF Merge combines multiple PDFs in any order you drag them into; PDF Split extracts either individual pages or a contiguous page range into a new document. Both tools stay narrow on purpose. No paywalls, no signup, no "upgrade for files over 5 MB". The only limit is your browser's memory, which on a modern laptop is plenty for any reasonable document.