PDF Expert
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    Contents
    • Using PDF Expert
      • Getting Started with PDF Expert
      • Highlight, underline, and strikethrough text
      • Text comments, shapes, and pop-up notes
      • Insert stamps to PDFs
      • Customize text and annotation colors
      • Draw on a PDF file
      • Use stickers in PDF Expert for iOS
      • View, search, and remove annotations
      • Export Annotation Summary
      • Content Selection Tool
      • Edit text in PDF files
      • Work with images in PDFs
      • Work with to-page and to-web links
      • Remove sensitive content
      • Supported forms and fields
      • Fill out PDF forms
      • Sign PDF documents
      • Enhance and adjust your scans
      • Convert scanned documents into text (OCR)
      • Scale and measure drawings
      • Polygon and polyline shapes
      • Red Line tools
      • Convert images, MS Office and iWork files to PDF
      • Export PDFs to other formats on Mac
      • Convert PDFs to images, Word, Excel, PowerPoint, Text files on iOS
      • Reading mode
      • Select your way to scroll pages
      • Enable the two-page view
      • Zooming modes in PDF Expert
      • Jump to a specific page
      • Bookmark pages
      • Create a table of contents in a PDF file
      • Turn on the Night or Sepia theme
      • Read PDF text out loud
      • Keep your device awake while reading
      • View two PDFs side by side
      • Add page numbers, bates numbers, and text
      • Use Smart Search
      • AI Chat with PDF
      • Page number indicator
      • Create a new PDF file
      • Add, delete, and rearrange PDF pages
      • Rename files and folders
      • Recents and Favorites
      • Sort files and folders by name, date, and size
      • Password protect PDFs
      • Save the file as flatten
      • Reduce the PDF file size
      • Merge PDFs
      • Manage annotated pages
      • Move files and folders
      • Switch between the Grid and List views
      • Mark files and folders with color tags
      • Open a file in PDF Expert
      • Organize your files with Inbox
      • Page Resize
      • Access your device files via the Files app folder
      • Sync your PDF files through web clouds
      • Sync a folder from cloud storage
      • Connect to Mac or PC via SMB
      • Set up sync with Mac via SFTP
      • Time Capsule setup
      • Share files via the Share button
      • Transfer files between iOS device and desktop using Wi-Fi
      • Transfer files from Safari to PDF Expert for iOS
      • Transfer files between iPad and iPhone using WebDAV
      • Share text with other apps
      • Share files from cloud via a link
      • Transfer files between PDF Expert and your Mac using a USB cable
      • PDF Expert Widgets
      • Turn on the Dark Mode
      • Work with tabs on your iPad
      • Customize the toolbar in PDF Expert for iOS
      • Create your own toolset in PDF Expert for iOS
      • Make PDF Expert your default PDF viewer on Mac
      • Open email attachments in PDF Expert
      • Keyboard Shortcuts
      • Make presentations with PDF Expert and FaceTime
      • Full Screen Mode on Mac
      • Getting Started with Tools tab on Mac
      • Presentation Mode
      • Improve your workflow with Sidecar and Camera Continuity
      • Change the app's language on iOS
      • Convert PDF to black and white on Mac
      • Supported Scripting in AcroForms (Adobe Acrobat forms)
      • Supported Scripting in XFA (LiveCycle Designer forms)
      • URL schemes
    • Troubleshooting
      • PDF Expert quits or doesn't open
      • PDF Expert freezes
      • All files in the app look blank
      • Annotation tools do not work
      • Printing issues on Mac
      • Corrupted files
      • Sync issues
      • Restore accidentally deleted files
      • File cannot be opened
      • Annotations made in PDF Expert are not displayed correctly in a third-party app on iOS
      • File loads slowly
      • Garbled text
      • AI Chat with PDF issues
      • Connection issues on iOS
      • iCloud files don't stay downloaded
    • Billing & Subscription
      • How to get PDF Expert
      • Set up an account for cross-platform app usage
      • How to get PDF Expert Premium
      • Check and manage your subscription
      • How to cancel the free trial
      • The PDF Expert License FAQ
      • The “trial expired” message appears after a purchase
      • Is PDF Expert available on Windows?
      • The PDF Expert Billing FAQ
      • The difference between PDF Expert 2 and PDF Expert 3
    • Contact us

    View two PDFs side by side

    Mac iPad iPhone

    In order to view two documents or two parts of the same document side by side within the PDF Expert app window, you use the Split View mode (Horizontal and Vertical). PDF Expert for Mac has several ways to enable Split View:

    • Open a pdf file and right-click any area in the tab > Select 'Split View'.
    • Open a pdf file and click 'View' on the main menu > Select 'Split View'.
    • Open the files in two tabs and click the area between the tabs. 
    • Click the View settings button on the top toolbar.
    • Drag and drop one tab over another one to enable the split mode.

    You can change the position of documents in Split View mode: right click on the document > Split View > select ‘Horizontal’ or ‘Vertical’. There is also the ability to Swap the documents sides: right click > Swap Sides.

    To disable Split View, please right click on the file > Split View > Disable Split View.

    If you would like to open a link/reference, which leads to a separate part of the PDF, in a split pane, right-click on the link and choose “Open Link in the Right Split Pane”.

    If your iPad runs iPadOS 13 or later, you can open multiple windows of PDF Expert and work on two or more PDFs simultaneously. This is a great way to compare documents or refer to one PDF while editing the other.

    How to view two PDFs side by side on iPad:

    1. Launch PDF Expert.
    2. Tap and hold on any PDF file and drag it out of PDF Expert.
    3. The file will appear in a new PDF Expert window.

    If you opened too many windows, just tap and hold on the PDF Expert icon on your Home screen and tap Show all Windows to see all the opened instances of the app.

    What if your device doesn’t support iPadOS?

    iPads with the older iOS versions have no option to open multiple instances of the same app. Instead, on your iPad with iOS 11 or later, you can use Split View to work with two different apps at the same time. For example, you can view two PDFs side by side by opening PDF Expert and our free Documents app at once. Split View is also convenient for moving files between apps with drag & drop.

    How to use Split View on your iPad:

    1. Open PDF Expert.
    2. Swipe up from the bottom of the screen to open the Dock.
    3. On the Dock, touch and hold the second app you want to open and drag it off the dock.

    How to adjust Split View:

    • To give the apps equal space on the screen, drag the app divider to the center of the screen.
    • To turn a Split View into a Slide Over, swipe down from the top of the app.
    • To close Split View, drag the app divider over the app you want to close.

    To make sure Split View works on your iPad, please open the Settings app. Go to General > Multitasking & Dock and check if the Allow Multiple Apps toggle is on.

    You can use Split View with iPad Pro, iPad (5th generation and later), iPad Air 2 and later, or iPad mini 4 and later.

    Due to the smaller screen size, PDF Expert doesn't support the Split View feature on iPhones.


    Read next: Add page numbers, bates numbers, and text
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