1. Open the PDF in Acrobat. From the global bar in the upper-left, select All tools > Protect a PDF. From the Protect a PDF toolset in the left pane, select Encrypt with Password.
Securing PDFs with passwords Part 2
Restrict printing, editing, and copying
You can prevent users from printing, editing, or copying content in a PDF. You can set the restrictions you want to apply to the PDF. Users can’t change these restrictions unless you provide the password.
Adobe Illustrator, Photoshop, or InDesign don't have view‑only modes. The user must enter the permissions password to open a restricted PDF in such apps.
Note
If you forget a password, you can’t recover it from the PDF. Consider keeping a backup copy of the PDF that isn’t password-protected.
2. If you receive a prompt, click Yes to change the security.
3. Select Restrict editing and printing of the document.
All Adobe products enforce the restrictions set by the permissions password. However, if third-party products don’t support these settings, document recipients can bypass some or all your restrictions.
4. Type the password in the corresponding field. Your password must be at least six characters long. For each keystroke, the password strength meter evaluates your password and indicates the password strength.
Password Security - Settings let you restrict printing, editing, and copying 5. Select what the user can print from the Printing allowed menu:
None Prevents users from printing the document.
Low resolution (150 dpi) Lets users print at no higher than 150‑dpi resolution. Printing may be slower because each page is printed as a bitmap image. This option is available only if the Compatibility option is set to Acrobat 5 (PDF 1.4) or later.
High resolution Lets users print at any resolution, directing high-quality vector output to Adobe PostScript and other printers that support advanced high-quality printing features.
6. Select what the user can change from the Changes allowed menu:
None Prevents users from modifying the documents listed in the Changes Allowed menu, such as filling in form fields and adding comments.
Inserting, deleting, and rotating pages Lets users insert, delete, and rotate pages, and create bookmarks and thumbnails. This option is only available for high (128‑bit RC4 or AES) encryption.
Filling in form fields and signing existing signature fields Lets users fill in forms and add digital signatures. This option doesn’t allow them to add comments or create form fields. This option is only available for high (128‑bit RC4 or AES) encryption.
Commenting, filling in form fields, and signing existing signature fields Lets users add comments and digital signatures, and fill in forms. This option doesn’t allow users to move page objects or create form fields.
Any except extracting pages Lets users edit the document, create and fill in form fields, and add comments and digital signatures.
7. Choose any of the following options:
Enable copying of text, images, and other content Lets users select and copy the contents of a PDF.
Enable text access for screen reader devices for the visually impaired Lets visually impaired users read the document with screen readers, but doesn’t allow users to copy or extract the document’s contents. This option is available only for high (128‑bit RC4 or AES) encryption.
8. Select an Acrobat version from the Compatibility menu. Choose a version equal to or lower than the recipients’ Acrobat or Acrobat Reader version. The Compatibility option you choose determines the type of encryption used. It's important to choose a version compatible with the recipient's version of Acrobat or Acrobat Reader. For example, Acrobat 7 can’t open a PDF encrypted for Acrobat X and later.
- Acrobat 6.0 And Later (PDF 1.5) encrypts the document using 128-bit RC4.
- Acrobat 7.0 And Later (PDF 1.6) encrypts the document using the AES encryption algorithm with a 128-bit key size.
- Acrobat X And Later (PDF 1.7) encrypts the document using 256-bit AES. To apply 256-bit AES encryption to documents created in Acrobat 8 and 9, select Acrobat X And Later.
9. Select what you want to encrypt:
Encrypt all document contents Encrypts the document and the document metadata. If this option is selected, search engines can’t access the document metadata.
Encrypt all document contents except metadata Encrypts the contents of a document but still allows search engines access to the document metadata.
NoteThe iFilter and the Find or Advance Search commands of Acrobat don’t look into the PDF’s metadata even when you select the Encrypt all document contents except metadata option. You can use a search tool that takes advantage of XMP metadata.
Encrypt only file attachments Requires a password to open file attachments. Users can open the document without a password. Use this option to create security envelopes.
10. Select OK. Retype the appropriate password in the box at the prompt to confirm the password and select OK.
Remove password security
You can remove security from an open PDF if you have the permissions to do so. If the PDF is secured with a server-based security policy, only the policy author or a server administrator can change it.
1. Open the PDF, then select All tools > Protect a PDF > Set security properties.
3. Your options vary depending on the type of password security attached to the document:
- If the document had only a Document Open password, deselect the Require a password to open the document option, and then select OK to remove it from the document.
- If the document had a Permissions password, deselect the Restrict editing and printing of the document option. Type the password in the Enter Password box when prompted, and then select OK. Select OK again to confirm the action.
Related Articles
Securing PDFs with passwords Part 1
Password security basics You can limit access to a PDF by setting passwords and by restricting certain features, such as printing and editing. However, you can't prevent saving copies of a PDF. The copies have the same restrictions as the original ...Setting up security policies for PDFs Part 2
Creating policies for secure file attachments You can add security to one or more documents by embedding them in a security envelope and sending it as an email attachment. This method is useful if you want to send a secure file attachment without ...Managing Digital IDs Part 2
Specify the default digital ID To avoid being prompted to select a digital ID each time your sign or certify a PDF, you can select a default digital ID. 1. In Acrobat, select the hamburger menu (Windows) or Acrobat menu (macOS) and then choose ...Securing PDFs with certificates Part 1
Certificate security Use certificates to encrypt documents and to verify a digital signature. A digital signature assures recipients that the document came from you. Encryption ensures that only the intended recipient can view the contents. A ...Securing PDFs with certificates Part 2
Add a certificate from a digital signature in a PDF You can safely add a certificate to your trusted identities from a signed PDF by first verifying the fingerprint with the originator or the certificate. 1. Open the PDF containing the signature. 2. ...