Guides & resources
Guides
Practical guidance for using PDF Core Tools safely, effectively, and with a clear understanding of limits.
Practical guides for everyday file work
These guides explain not only which button to press, but also what happens to your files, which limits matter, and what you should check before using the result. New tool-specific guides will be added as each tool page is completed.
Combine different document formats into one professional PDF
Learn how to prepare JPG, PNG, WebP and TIFF scans, combine them with PDFs, organize page order, remove mistakes, correct rotation, add continuous page numbers and optimize the finished document.
Merge PDF files
Learn how to combine PDFs and supported image files, arrange their order, preview items, remove unwanted files, add blank pages, and download one finished PDF.
File privacy and browser processing
Understand the difference between local browser processing and server uploads, what temporary browser memory means, and how to reduce risks when working with confidential documents.
Copyright and responsible use
Using a PDF tool does not transfer ownership or remove licence conditions. Review the responsible-use guidance before processing copyrighted, licensed, confidential, or access-restricted material.
Limits, quality and troubleshooting
Large files, unusual fonts, damaged PDFs, encrypted documents, browser memory, and device performance can affect results. The Help Center explains the most common issues and practical checks.