About this file viewer
A free, private way to open and present files online — no software to install.
How it works
Everything happens inside your browser. When you choose a file, JavaScript reads it locally and renders it with a battle-tested open-source library — PDF.js for PDFs, SheetJS for spreadsheets, epub.js for e-books, and many more. Heavier formats use WebAssembly to run native engines safely in the browser tab.
Your files stay yours
Because the file is never uploaded, it never touches a server. There is no account, no storage and no tracking of your documents. Close the tab and nothing remains.
Works on every device
The interface is responsive and touch-friendly, so it works the same on a phone, an iPad or a desktop. Once the page has loaded it can even open files offline.
Open source under the hood
This site is a static website built with Eleventy. The viewers are powered by the open-source libraries listed on each format’s page.