The only macOS app that corrects scanned book PDFs with AI-powered neural unwarping and physics-based spine simulation, both in the same tool, blendable to taste.
macOS 14 Sonoma+ · Apple silicon · Native Swift · GPU-accelerated · Runs fully offline
Flatbed scanners capture glass edges. Book scans always have asymmetric left/right margins. DeskewPro removes both in one pass.
Pages near the binding curve away from the scanner. Text gets blurred and bowed. DeskewPro's deblur and dewarp pipeline unfolds them flat.
Most scan-cleanup tools are Linux-first, Java-based, or treat cropping as a visual mask. DeskewPro is 100% native Swift, built exclusively for macOS, and actually removes cropped pixels. Free to try, $9.99 to unlock for good.
Spine Correction
Most tools guess at a cylinder. DeskewPro gives you a choice and lets you blend between them.
A neural network trained on thousands of real document photographs predicts the 3D surface of the page and produces a pixel-perfect backward-mapping grid. Handles complex, irregular warps automatically.
Models the page as a physical elastic sheet bending at the spine, computed from first principles. Gives you explicit control over curvature, tilt, and perspective.
Interpolate the displacement fields from both models with a single slider. Dial in the exact mix for each document. More ML for complex warps, more physics for predictable spines.
Smart Cropping
Every book scan has asymmetric margins. The gutter side is always narrower than the outer edge. DeskewPro's even/odd template system handles this automatically, with per-page overrides when you need them.
Features
Professional-grade tools for turning raw flatbed or overhead-scanner output into archival-quality PDFs.
Deblur, dewarp, and adaptive sharpen run through a Metal compute shader on your GPU. Even 8K export renders fast.
Read the docsSet one crop template for left-facing pages and another for right-facing. Applied automatically across hundreds of pages.
Read the docsCombine pages from multiple scan sessions into a single project. Drag-and-drop reordering, per-document numbering, and auto-save.
Read the docs1080p, 4K, 8K, or custom pixel budget. Uniform page sizing or variable per-page. Adjustable JPEG quality. Never upscales beyond source DPI.
Read the docsConvert text pages to crisp 1-bit black and white with adaptive Sauvola and Wolf thresholding. Tiny CCITT G4 files for archives and OCR pipelines, with per-page control to keep photo pages in color.
Read the docsAdd an invisible, selectable text layer so your exported PDFs are fully searchable. Recognition runs entirely on-device and re-runs on every export, so the text always matches the current crop and rotation.
Read the docsExport self-contained PDF/A-2b files, the long-term preservation standard required by many libraries and government archives. Combines with OCR and binarization in a single export.
Read the docsMark blank pages, duplicates, or cover inserts to exclude from export without removing them from the project.
Read the docsFull undo/redo across all operations. Crops, rotations, page reordering, removals, and resets. Every action is reversible.
Read the docsArrow keys navigate pages. Every major action has a shortcut. Online help documents all of them.
See all shortcutsNo cloud, no account, no telemetry. Your documents never leave your machine. The ML model runs on-device via Apple's Core ML.
Privacy policyAdjustments render in real time as you drag. See exactly what the exported page will look like before committing.
Read the docsScanned as separate left and right images that overlap at the gutter? DeskewPro finds the shared strip and merges each pair into one spread, so the overscan appears only once. Built for full-bleed magazine scans.
Read the docsOne image per spread? Two-Up mode gives the left and right pages their own crop boxes and exports each spread as two pages, with a spine handle that moves both inner edges together.
Read the docsIllumination correction flattens scanner vignetting and the shadow that falls toward the spine, so text at the edges reads as clearly as text in the center. Gaussian or morphological, tunable per document.
Read the docsHow It Works
A three-step workflow designed for batch processing. Set it up once, export hundreds of pages consistently.
Drop one or more PDFs. Pages load and thumbnail instantly. Drag to reorder across multiple scan passes.
Set even/odd crop templates, apply spine correction, adjust rotation. Previews update in real time as you drag.
Choose resolution and quality. Every page renders through the GPU pipeline consistently and quickly.
Who It's For
Whether you're preserving a rare edition or cleaning up a borrowed textbook, DeskewPro handles it.
Digitize collections with consistent margins across hundreds of volumes. Even/odd templates and spine correction ensure every page matches, across books, not just within them.
Preserve game manuals, strategy guides, and out-of-print materials. Fix the crooked flatbed scans and spine blur that make them hard to read on screen.
Create digital backups of rare or out-of-print editions at archival quality. Works with flatbed scanners, overhead rigs (CZUR, etc.), and phone camera captures.
Clean up textbook and reference material scans. Skip irrelevant pages, crop out margins, and export exactly what you need for reading on iPad or Kindle.
Common Problems DeskewPro Solves
DeskewPro's crop templates strip scanner-glass borders from every page in one pass. Set it once, apply to all.
DeskewPro is built specifically for this. Correct page skew in 0.5° steps, for the whole document or one page at a time, with a live preview.
ScanTailor has no official macOS build. DeskewPro is the native macOS alternative. Real-time preview, GPU-accelerated, free to try, and $9.99 once to unlock.
That's the flagship feature. Two correction models (AI neural + physics) blendable to your document. Handles left, right, center, top, and bottom spines.
Exactly what Even/Odd Templates do. Left and right pages in a book never have the same margins. DeskewPro treats them separately.
DeskewPro is free to download and try, with a light diagonal watermark across exported pages. A one-time $9.99 purchase unlocks it permanently. No subscription, no account, no cloud. Your documents never leave your Mac.
Use Two-Up mode. Each scanned spread gets a left and a right crop box, and every spread exports as two separate pages. Any page that needs different handling can be overridden on its own.
Combine Facing Pages finds the overscan that both scans share at the gutter and joins them into one spread page, drawing the duplicated strip only once. Made for full-bleed magazine scans, including Internet Archive material.
Turn on searchable text (OCR) at export. DeskewPro adds an invisible text layer using on-device recognition, and it re-runs on every export so the text matches your final crop and rotation. Combine it with PDF/A for a searchable archival file.
Turn on the Lighting stage. Illumination correction flattens the dark band that falls toward the spine and the vignetting from flatbed and overhead scanners, without touching color or detail. Push Strength past 1 for stubborn shadows.
DeskewPro is coming soon. Free to download and try, with a one-time $9.99 unlock and no subscription or account. The native macOS app your scanned books deserve.
