How to Encrypt / Password Protect PDF

How to Encrypt / Password Protect PDF

GoodReader will help you to encrypt your PDF with a password to keep sensitive data confidential.
First, transfer a file to GoodReader (see: How To Import Files & Folders), then tap a file name to open it.
Add or Upgrade PDF Password and Encryption

Use the Actions menu to add a password and military-grade AES-256 encryption to your PDF files. For older PDF files with weak encryption, use the same menu to upgrade it to the modern AES-256 standard.
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I use this app quite a bit for reading PDF ebooks and academic papers and it's awesome! I can crop PDFs with large margins so the text isn't as tiny, I can highlight and annotate, etc. The app hasn't been updated in two years, though a recent developer response indicated they're working on version 5. This is great news and I can't wait. I would like them to add a feature for true night mode reading where the screen goes black and the text is white, like Adobe Acrobat can, do instead of the current night mode which just lowers the intensity of the white.

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