About

A set of PDF tools that run in the browser rather than on a server, built because the alternative is uploading a document you may not want to upload in order to do something your own machine could have done.

How it works

Two libraries do the work. One reads and rebuilds the structure of the file; the other renders the page thumbnails. Both run in your browser and neither talks to a network. The site is static files on a CDN with no application server behind it, which is why the privacy claim can be stated without qualification — there is nowhere for a file to be sent.

One implementation note worth recording: the widely used version of the editing library has had no development since 2021. This uses an actively maintained fork instead.

What it cannot do

It cannot open a password-protected document without the password, and it will say so rather than pretending. It does not do optical character recognition, does not convert to Word, and does not compress — all three need substantially more machinery, and doing them badly would be worse than not offering them.

Corrections

If a tool mangles a file, I would like the details: [email protected].