PaperStack is a free, browser-based collection of PDF tools — built for anyone who needs to merge, split, compress, convert, sign, or protect a PDF without paying for software or uploading sensitive files to unknown servers.
Most "free" PDF tools online upload your files to a server somewhere before processing them. PaperStack does the opposite — every tool runs entirely inside your browser. Your files never leave your device, which means your documents stay private, and the tools work fast since there's no upload queue.
PaperStack is built and maintained by a solo developer based in Kozhikode, Kerala, India. It started as a side project to make everyday PDF tasks faster and more private for everyone.
PaperStack is supported by ads shown on the site. No subscriptions, no premium tiers, no file limits — just free tools for everyone.