THE FILES.CO JOURNAL
Notes on PDFs, privacy, and standards.
How the tools work, why your files never leave the browser, and the technical detail that matters.
You sent the signed form. The person who got it can still change the numbers
A filled PDF form stays editable after you send it, and an altered copy looks exactly as legitimate as yours. Flattening turns a form with answers in it into a document.
Aug 9, 2026 · 5 min readGuidesHow to Create a Clickable Table of Contents in a PDF
Turn a long PDF into a document readers can actually navigate. Build a clickable table of contents with bookmarks and page numbers, entirely in your browser.
Aug 9, 2026 · 6 min readGuidesFrom photo to document: why your scanned PDF looks wrong
Grey paper, shadows, faded text. What actually happens to a photo of a document, and how the new files.co scanning tool fixes it.
Aug 9, 2026 · 4 min readSecurityA black box erases nothing: redacting a PDF properly
Covering data with a rectangle leaves the text intact underneath. A new files.co tool redacts for real, without the file ever leaving your machine.
Aug 8, 2026 · 4 min readStandardsHow to make a PDF accessible: an intro to PDF/UA
An accessible PDF works for screen readers and everyone else. Here's what PDF/UA means, why tagging matters, and the steps that get a file there, starting in your browser.
Aug 8, 2026 · 5 min readPrivacyThe metadata that travels with your documents (and how to leave it behind)
A PDF holds more than what you can see. Author, software and timestamps ride along wherever it goes. A new files.co tool shows them and strips them, without uploading anything.
Aug 7, 2026 · 5 min readNo spam. Just PDF craft.
Once in a while, a useful note on PDFs and privacy.