Free Options to Markup PDF Documents and Scan on Devices
All of these options can be downloaded from the Apple App Store or Google Play Store unless otherwise noted.
Markup a PDF in OneDrive
Note: To access your Office 365 account and apps like OneDrive, login at http://portal.office.com
Markup a PDF in OneDrive for iOS: https://support.office.com/en-us/article/Mark-up-a-PDF-in-OneDrive-for-iOS-b7807b8a-8323-4406-99b0-0b13882a8d03
Markup a PDF in OneDrive for Android: https://support.office.com/en-us/article/mark-up-a-pdf-in-onedrive-for-android-58a4cb71-26b2-461b-8920-25a8acce1776
Books App and Notes App in iOS (Apple App Store Only)
Save and mark up PDFs on your iPhone, iPad, or iPod touch with the Books app: https://support.apple.com/en-us/HT205751
More Apple Markup options: https://support.apple.com/en-us/HT206885
Use the Notes app to capture a quick thought, create checklists, sketch ideas, and more.
XODO PDF Reader – iOS, Android, Desktop
Click on the download button in the navigation bar and select your option: https://www.xodo.com/
Genius Scan - Scan to PDF App – iOS or Android
Genius Scan: https://thegrizzlylabs.com/genius-scan
Adobe Acrobat Reader DC – iOS, Android, Desktop
Note: You can skip the sign in process in the app to use for free. You can markup by using the Fill & Sign feature and then save the PDF on your device or computer.