# How to password-protect a PDF on iPhone | Nimbo

> Add a password to a PDF on iPhone before sending payslips, contracts or medical files. Encryption is done by iOS on your device.

On iPhone with Nimbo

# How to password-protect a PDF on iPhone

Written by the Nimbo team · Last updated October 1, 2026

Short answer

To password-protect a PDF on iPhone, open it in Nimbo, tap PDF Tools, then Protect with Password, and type the password twice. Nimbo saves an encrypted copy that asks for the password when opened, on any device.

## Step by step

1. Open the PDF in Nimbo.
2. Tap PDF Tools, then Protect with Password.
3. Enter and confirm the password.
4. Save the protected copy, then Share it.
5. Send the password separately (by message, not in the same email).

## Why Nimbo

- Standard PDF encryption, readable everywhere.
- Done on your iPhone.
- The unprotected original stays in your Library.

## Frequently asked questions

### Can the recipient open it on Windows?

Yes. Any [PDF reader](https://nimbopdf.com/pdf-reader/) asks for the password.

### What if I forget the password?

It cannot be recovered; keep the original or note the password.

### Is the file uploaded?

No. Encryption is done on your iPhone.

## Related tools

[Edit metadata](https://nimbopdf.com/edit-pdf-metadata/)[Flatten PDF](https://nimbopdf.com/flatten-pdf/)

## More guides

- [How to sign a PDF on iPhone (in seconds)](https://nimbopdf.com/how-to-sign-a-pdf-on-iphone/)
- [How to scan a document to PDF on iPhone](https://nimbopdf.com/how-to-scan-a-document-to-pdf-on-iphone/)
- [How to translate a whole PDF on iPhone and keep the layout](https://nimbopdf.com/how-to-translate-a-pdf-on-iphone/)
- [How to ask questions to a PDF on iPhone (with the exact source)](https://nimbopdf.com/how-to-ask-questions-to-a-pdf-on-iphone/)

---

Source: https://nimbopdf.com/how-to-password-protect-a-pdf-on-iphone/ · Nimbo (English) · https://nimbopdf.com/llms.txt