Choose Preferences.
- Acrobat User Guide
- Introduction to Acrobat
- Workspace
- Workspace basics
- Opening and viewing PDFs
- Working with online storage accounts
- Acrobat and macOS
- Acrobat notifications
- Grids, guides, and measurements in PDFs
- Asian, Cyrillic, and right-to-left text in PDFs
- Workspace basics
- Creating PDFs
- Editing PDFs
- Edit text in PDFs
- Edit images or objects in a PDF
- Rotate, move, delete, and renumber PDF pages
- Edit scanned PDFs
- Enhance document photos captured using a mobile camera
- Optimizing PDFs
- PDF properties and metadata
- Links and attachments in PDFs
- PDF layers
- Page thumbnails and bookmarks in PDFs
- PDFs converted to web pages
- Setting up PDFs for a presentation
- PDF articles
- Geospatial PDFs
- Applying actions and scripts to PDFs
- Change the default font for adding text
- Delete pages from a PDF
- Scan and OCR
- Forms
- PDF forms basics
- Create a form from scratch in Acrobat
- Create and distribute PDF forms
- Fill in PDF forms
- PDF form field properties
- Fill and sign PDF forms
- Setting action buttons in PDF forms
- Publishing interactive PDF web forms
- PDF form field basics
- PDF barcode form fields
- Collect and manage PDF form data
- About forms tracker
- PDF forms help
- Send PDF forms to recipients using email or an internal server
- Combining files
- Combine or merge files into single PDF
- Rotate, move, delete, and renumber PDF pages
- Add headers, footers, and Bates numbering to PDFs
- Crop PDF pages
- Add watermarks to PDFs
- Add backgrounds to PDFs
- Working with component files in a PDF Portfolio
- Publish and share PDF Portfolios
- Overview of PDF Portfolios
- Create and customize PDF Portfolios
- Sharing, reviews, and commenting
- Share and track PDFs online
- Mark up text with edits
- Preparing for a PDF review
- Starting a PDF review
- Hosting shared reviews on SharePoint or Office 365 sites
- Participating in a PDF review
- Add comments to PDFs
- Adding a stamp to a PDF
- Approval workflows
- Managing comments | view, reply, print
- Importing and exporting comments
- Tracking and managing PDF reviews
- Saving and exporting PDFs
- Security
- Enhanced security setting for PDFs
- Securing PDFs with passwords
- Manage Digital IDs
- Securing PDFs with certificates
- Opening secured PDFs
- Removing sensitive content from PDFs
- Setting up security policies for PDFs
- Choosing a security method for PDFs
- Security warnings when a PDF opens
- Securing PDFs with Adobe Experience Manager
- Protected View feature for PDFs
- Overview of security in Acrobat and PDFs
- JavaScripts in PDFs as a security risk
- Attachments as security risks
- Allow or block links in PDFs
- Electronic signatures
- Sign PDF documents
- Capture your signature on mobile and use it everywhere
- Send documents for e-signatures
- Create a web form
- Request e-signatures in bulk
- Collect online payments
- Brand your account
- About certificate signatures
- Certificate-based signatures
- Validating digital signatures
- Adobe Approved Trust List
- Manage trusted identities
- Printing
- Accessibility, tags, and reflow
- Searching and indexing
- Multimedia and 3D models
- Add audio, video, and interactive objects to PDFs
- Adding 3D models to PDFs (Acrobat Pro)
- Displaying 3D models in PDFs
- Interacting with 3D models
- Measuring 3D objects in PDFs
- Setting 3D views in PDFs
- Enable 3D content in PDF
- Adding multimedia to PDFs
- Commenting on 3D designs in PDFs
- Playing video, audio, and multimedia formats in PDFs
- Add comments to videos
- Print production tools (Acrobat Pro)
- Preflight (Acrobat Pro)
- PDF/X-, PDF/A-, and PDF/E-compliant files
- Preflight profiles
- Advanced preflight inspections
- Preflight reports
- Viewing preflight results, objects, and resources
- Output intents in PDFs
- Correcting problem areas with the Preflight tool
- Automating document analysis with droplets or preflight actions
- Analyzing documents with the Preflight tool
- Additional checks in the Preflight tool
- Preflight libraries
- Preflight variables
- Color management
For a full list of articles about security, see Overview of security in Acrobat and PDF content.
Protected View provides an additional level of security. When Protected View in enabled, PDFs are displayed in a restricted environment called a sandbox. This isolation of the PDFs reduces the risk of security breaches in areas outside the sandbox. Adobe strongly recommends that you use Acrobat in Protected View if you are concerned about security, or if you frequently interact with PDFs on the Internet.
Adobe Acrobat Reader includes a similar restricted environment called Protected Mode. For information about Reader Protected Mode, see Reader Help.
When Protected View is enabled, only basic navigation is allowed. For example, you can open PDFs, scroll through pages, and click links. You can enable Protected View in a PDF that you view in either stand-alone Acrobat or in a web browser.
PDF in stand-alone Acrobat
In Protected View, Acrobat displays a warning for a PDF that doesn’t originate from a trusted location. The warning lets you decide whether to trust the document.
You can find out whether a PDF opened in a browser is in Protected View. Right-click the document in the browser and choose Document Properties. Click the Advanced tab. When Protected View is enabled, the status says Protected Mode: On.
Enable or disable Protected View
Unlike Protected Mode in Acrobat Reader, Protected View in Acrobat is off by default.
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From the Categories on the left, select Security (Enhanced).
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Select the Enable Enhanced Security option.
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Choose one of the following options:
Off
Disables Protected View, if you have enabled it. Protected View is off by default.
Files From Potentially Unsafe Locations
Enables Protected View and displays the warning for all files originating from an untrusted location. Files and locations that you add to the Privileged Locations area of the Enhanced Security panel are exempt from Protected View.
All files
Enables Protected View in all PDFs that you open in either stand-alone Acrobat or in a browser.
Bypass Protected View restrictions
Choose any of these options:
Select Off in the Enhanced Security panel of the Security (Enhanced) preferences.
Add files, folders, and locations to the Privileged Locations area of the Enhanced Security panel. (See Specify privileged locations for trusted content.)
Additional resources
For more information on Protected View, see the following resources:
Protected View troubleshooting: Protected View troubleshooting.
Application Security Guide: www.adobe.com/go/learn_acr_appsecurity_en.