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    Contents
    • Using 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
      • 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
      • Insert stamps to PDFs
      • 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
      • 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
      • View files using iTunes
      • 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
      • 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
      • PDF Expert Widgets in iOS14
      • 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
      • Share files from cloud via a link
      • Make presentations with PDF Expert and FaceTime
      • Full Screen Mode 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 on iOS device
      • 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 visible in a third-party app
      • File looks blurry
      • The search results look garbled (only Mac)
    • 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
    • Contact us

    Red Line tools

    May 16th, 2022

    Use callout, cloud, and stamp tools to add notes and comments in a quick and neat way. Snapping will give your notes a neat structure. Special support for hardware keyboards will make text typing quick. All tools are WYSIWYG and you see the final result at any moment.

    Note: The construction toolset is currently available only for the iPhone and iPad version of PDF Expert and is a part of the PRO subscription.

    Use the arrow tool

    1. Open a file you’d like to work with.
    2. Tap the Red Line tab at the top.
    3. Select the Arrow tool. You can select the color for the tool by tapping the color picker. By tapping the color picker, you also get access to other properties such as the arrow type, thickness, border style, and opacity.
    4. Tap where you want to insert an arrow.
    • To move the arrow, tap and drag it.
    • To resize or rotate the arrow, tap and hold, then drag one of the ends.
    • To edit the arrow, tap it and select Properties in a pop-up menu.
    • To remove the arrow, tap it and select Delete.

    Use the callout tool

    to add text notes pointing to a specific object on a page.

    1. Open a file you’d like to work with.
    2. Tap the Red Line tab at the top.
    3. Select the Callout tool. You can select the color for the tool by tapping the color picker. By tapping the color picker, you also get access to other properties such as the font and border settings.
    4. Tap where you want an arrow to point to, then drag to the place where you’d like to insert a callout.
    5. Type in your note.
    • To move the callout, tap and hold it.
    • To resize or rotate the callout, tap and hold, then drag one of the ends.
    • To edit the callout, tap it and select Properties in a pop-up menu.
    • To remove the callout, tap it and select Delete.

    Use the cloud tool

    to draw attention to the areas that were changed or need to be updated.

    1. Open a file you’d like to work with.
    2. Tap the Red Line tab at the top.
    3. Select the Cloud tool. You can select the color for the tool by tapping the color picker. By tapping the color picker, you also get access to other properties such as the cloud type, border settings, hatch patterns, fill color, and opacity.

    Follow the onscreen instructions.

    • To move the cloud, tap and hold it.
    • To resize or rotate the cloud, tap and hold, then drag one of the ends.
    • To edit the cloud, tap it and select Properties in a pop-up menu.
    • To remove the cloud, tap it and select Delete.

    Note: To undo the changes, tap  on the toolbar. If you need to redo your edits, tap&hold  and select Redo.

    If you frequently use a particular shape, e.g. the red arrow, you can add it to the Favorites to work even faster. Learn how to create your own toolset in PDF Expert.

    Read next: Scale and measure drawings
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