Guides
Prepping PDFs for Claude & ChatGPT
Short, practical fixes for the everyday friction of working with PDFs and AI — trimming, citations, and file limits.
What to do when ChatGPT says your PDF is too long
Why it happens, and how trimming to the pages you need fixes it.
Why ChatGPT invents page numbers from your PDFs (and how to stop it)
The one prompt that keeps AI citations honest and checkable.
How to feed multiple PDFs to Claude or ChatGPT
Getting several sources in without hitting the file or context limit.
Can you upload confidential documents to ChatGPT?
The real risk for legal, financial and medical files, and a safer local-first way to work.
How Many PDF Pages Can Claude Read?
API vs. chat app limits, why the context window matters more than page count, and what to do with large PDFs.
PDF Source Prep · a free, browser-only tool for prepping PDFs for Claude and ChatGPT.
Your files never leave your browser.
Your files never leave your browser.