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

    Enhance and adjust your scans

    With PDF Expert, it's easy to make the best of your scans.

    Jump to:
    • Enhance scans
    • Split pages
    • Crop pages
    • Clear Margins
    • Troubleshooting

    Enhance scans

    Fix distortions, remove shadows, and improve the contrast of scans:

    1. Open a PDF file containing a scanned image in PDF Expert for Mac.
    2. Select the Scan & OCR tab.
    3. Click Enhance Scan to enter a preview mode.
    4. Choose the color filter on the sidebar on the right.
    5. If needed, remove distortion and set the page size.
    6. Click the blue Enhance... button in the right to apply changes. If there is more than one page, set pages you'd like to process and click Apply.

    Split pages

    To split double-page scans into two separate pages, follow these steps:

    1. Open a PDF file containing double-page scans in PDF Expert for Mac.
    2. Select the Scan & OCR tab.
    3. Click Split Pages to enter a preview mode.
    4. If needed, adjust the split line using the blue bullets on it.
    5. Click the blue Split... button in the right to apply changes. If there is more than one page, set pages you'd like to process and click Apply.

    Crop pages

    Set a custom page size to control the width of margins and unify the paper format throughout the document:

    1. Open a PDF file containing a scanned image in PDF Expert for Mac.
    2. Select the Scan & OCR tab.
    3. Click Crop Pages to enter a preview mode.
    4. If needed, adjust a custom page size.
    5. Click the blue Crop... button in the right to apply changes. If there is more than one page, set pages you'd like to process and click Apply.

    Clear Margins

    Clearing margins is handy when you need to free up space for notes and improve your printing experience. To fill page margins with color, do the following:

    1. Open a PDF file containing a scanned image in PDF Expert for Mac.
    2. Select the Scan & OCR tab.
    3. Click Clear Margins to enter a preview mode.
    4. If needed, adjust margins using the blue bullets on them.
    5. Choose a color from a palette on the right or customize it to fill the margins.
    6. Click the blue Clear Margins... button in the right to apply changes. If there is more than one page, set pages you'd like to process and click Apply.

    Troubleshooting

    If you’re experiencing any issues with the Text Recognition feature in PDF Expert, please make sure you have the app version 3.0 or later installed. Then try to quit the app and launch it again. If the situation hasn’t been resolved, please contact our support team at rdsupport@readdle.com. In your message, describe the issue and we will keep in touch to help.

    Read next: Convert scanned documents into text (OCR)
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