Features

Momovu provides specialized tools for book publishers and designers to preview PDFs with professional margin visualization.

Document Type Support

Interior Pages

Preview your book’s content pages with:

  • Safety margin visualization - See exactly where content is safe from trimming

  • Gutter margin extension - Additional margin space for binding, automatically calculated based on page count

  • Spread view - View pages side-by-side as readers will see them

  • Spine line indicator - Visualize the book’s center fold in spread view

  • Page navigation - Jump to any page instantly

Cover Documents

Verify your book covers with:

  • Automatic spine width calculation - Enter page count, see exact spine dimensions

  • Fold line indicators - Know exactly where the spine edges will be

  • Barcode placement guide - Standard barcode area visualization

  • Full cover preview - See front, spine, and back as one unit

Dustjacket Documents

Complete dustjacket visualization:

  • Flap dimensions - Standard 3.25” x 9” flaps with safety margins

  • Multiple fold lines - All fold positions clearly marked

  • Complete layout view - See the entire dustjacket spread

  • Separate margin zones - Different margins for flaps, covers, and spine

Visual Overlays

Cover document without overlays

Cover document showing clean view without any overlays

Safety Margins

  • Blue/purple overlay shows the safe content area (12.7mm / 0.5 inches)

  • Toggle on/off with Ctrl+M to compare with and without margins

  • Semi-transparent so you can see your content underneath

Trim Lines

  • Black edge lines show exactly where pages will be cut

  • Essential for bleed verification - ensure images extend past trim

  • Toggle with Ctrl+T

Fold Lines

  • Purple dashed lines indicate all fold positions

  • Document-specific - spine folds for covers, all folds for dustjackets

  • Toggle with Ctrl+L

Barcode Area

  • Orange indicator shows standard barcode placement (covers/dustjackets only)

  • Lower-right back cover positioning

  • Toggle with Ctrl+B

Bleed Lines

  • Light blue lines show actual page edges (covers/dustjackets only)

  • Outside trim lines - indicate full page boundaries for print production

  • Document-specific offsets - 3.18mm for covers, 6.35mm for dustjackets

  • Toggle with Ctrl+R

Gutter Margins

  • Green overlay (#79C196) shows additional binding space (interior documents only)

  • Automatic sizing based on page count: - 61-150 pages: 1.5mm per page (3mm total) - 151-400 pages: 6.5mm per page (13mm total) - 401-600 pages: 8mm per page (16mm total) - Over 600 pages: 9.5mm per page (19mm total)

  • Smart positioning - Appears on spine side of each page

  • Toggle with Ctrl+U

View Modes

Single Page View

  • Detailed inspection - Focus on one page at a time

  • Full zoom range - From 10% to 1000%

  • Smooth navigation - Page Up/Down to move through document

Side-by-Side View

  • Book spread simulation - See pages as they appear in print

  • Proper page pairing - First page alone, then left/right spreads

  • Interior documents only - Toggle with Ctrl+D

Presentation Mode

  • Distraction-free review - Full screen with no UI elements

  • Maintains overlays - All margin visualizations remain active

  • Quick navigation - Page Down/Space for next, Page Up for previous

  • Exit anytime - Press F5 or Escape

Text Selection and Copying

  • Select and copy text from PDFs

  • Click and drag to select text with visual blue highlight

  • Ctrl+C to copy selected text to clipboard

Find Text

Find text in documents with highlighting and navigation (Ctrl+F)

Font Information

View detailed information about fonts used in your PDF document:

  • Access the feature - Document menu → Font Information or press Ctrl+I

  • Font details displayed:

    • Font Name - The name of each font used in the document

    • Font Type - Whether the font is TrueType, Type 1, or another format

    • Embedding Status - Shows if the font is embedded, subset, or not embedded

  • Understanding font embedding:

    • Embedded - The complete font is included in the PDF, ensuring it displays correctly everywhere

    • Subset - Only the characters actually used in the document are embedded, reducing file size while maintaining appearance

    • Not embedded - The font must be available on the viewing system, or a substitute font will be used

  • When to use this feature:

    • Before sending to print - Verify all fonts are properly embedded to avoid printing issues

    • Troubleshooting display problems - Check if missing fonts are causing text to appear incorrectly

    • File size optimization - See which fonts are fully embedded versus subset

    • Quality control - Ensure your document will look the same on all systems

The font information window provides a quick way to verify that your PDF will display and print correctly, regardless of where it’s opened.

Professional Publishing Features

Spine Width Calculation

  • Automatic calculation from page count

  • Multiple printer formulas - Choose between Lulu (default) and Lightning Source

  • Paper weight options - Lightning Source supports various paper weights

  • Industry-standard spine dimensions

  • Real-time updates when page count changes

  • Dedicated calculator tool - Access via Document → Spine Width Calculator (Ctrl+K)

  • Support for both covers and dustjackets

  • Minimum spine width - 6.35mm (0.25”) for covers

  • Formula selection - Configure in File → Preferences → Formulas tab

Customizable Dimensions

  • User-configurable dimension settings - Adjust safety margins, bleed areas, and other measurements

  • Dimensions preferences - Access via File → Preferences → Dimensions tab

Multiple Document Support

  • Quick document type switching via Document menu

  • Preserves settings when changing between interior/cover/dustjacket

  • Optimized layouts for each document type

Dustjacket showing trim lines and fold lines

Dustjacket with trim lines and fold lines visible for precise cutting and folding

Quality Control Tools

Visual Verification

  • Toggle overlays independently - Compare with/without each overlay

  • High contrast indicators - Clear visibility of all guides

  • Zoom to details - Inspect specific areas closely

Performance

  • Handles large PDFs smoothly regardless of page count

  • Efficient rendering - Only visible pages are processed

  • Fast navigation - No lag when jumping between pages

  • Advanced zoom rendering - High-quality display at all zoom levels

  • Intelligent caching - Recently viewed areas cached for instant panning

  • Progressive rendering - Low-quality preview during zoom, high-quality after

  • Memory-efficient - Smart cache management prevents excessive memory use

  • Presentation mode optimization - Always uses full quality rendering

Interior pages showing safety margins

Interior pages in side-by-side view with safety margins and gutters visible