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

    Reduce the PDF file size

    In case you need to reduce your file's size, no matter if it's for sending it out via email or just to save some space, PDF Expert lets you optimize PDF files right on your iOS device or Mac. You can select the desired quality and even see the size of the future file. The file size reduction is not available in the free version of the app. 

    Note: This feature works only for the files saved locally. To reduce the size of the files saved on the cloud please save them locally first. It's not possible to undo the process.

    How to reduce the file's size

    Mac iOS
    1. Open your file.
    2. Tap More ... at the top right.
    3. Select Reduce File Size. 
    4. Choose the needed quality: Lossless, High, Medium, or Low. If you have some images that need to preserve the quality, you can use the Lossless option. 
    5. Tap Reduce.

    Note: Some files can't be reduced - for instance, files that are not converted to PDF or do not contain any images or were created with vector graphics.

    Tip: There is an alternative method for reducing the file's size in case you don't want to reduce it drastically - for this, you can create a ZIP archive of the file if you use the Compress option. 

    1. Open your file.
    2. Go to File at the top left.
    3. Select Reduce File Size.
    4. Select the needed document quality: the Lossless, High, Medium, and Low options. If you have some images that need to preserve the quality, you can use the Lossless option. 
    5. Select Save or Save As if you want to save a copy.
    6. Select Share if you'd like to share the compressed file.

    Note: Some files can't be reduced - for instance, files that do not contain any images or were created with vector graphics.

    Tip: There is an alternative method for reducing the file's size in case you don't want to reduce it drastically - for this, you can create a ZIP archive online or in any other app that has the feature.

    Read next: Merge PDFs
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    Features

    • Edit PDF
    • Fill PDF
    • Sign PDF
    • Merge PDF

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