Guides
Step-by-step help with the file jobs people ask about most, and what to do when something doesn’t work.
How to make a PDF smaller for email or an upload form
Why a PDF is too big, how to get it under a limit like 2 MB, and what to do when it still won’t fit.
How to merge PDF files into one, in the right order
Combine PDFs into one file, set the page order, and deal with locked files and size limits.
What is a HEIC file, and how do you open one?
Why iPhone photos end in .heic, how to turn them into JPG, and how to stop your iPhone making them.
How to reduce an image’s file size to a limit like 100 KB
What makes an image file big, how to hit an exact size limit, and which format to choose.
How to sign a PDF without printing it
Add a drawn, typed or scanned signature to a PDF, and know when that kind of signature is enough.
How to edit a PDF: add text, cover words and mark it up
What you can and can’t change in a PDF, how to replace a word, and when covering text isn’t enough.