Split scanned spreads into reading pages
Split each scanned spread into real reading pages at an explicit vertical proportion after visible crop and rotation.
- 1Add input
- 2Adjust settings
- 3Get your result
Tool input and files are processed in this browser without being uploaded.
Before you start
The cut is a proportion of the visible,rotated page width. Choose left-first/right-first and optionally keep the first/last source whole. Mixed page sizes use the same proportion; no automatic gutter detection,perspective correction,OCR or deskew.
How to use this tool
- Select a scanned-spread PDF.
- Set cut ratio,reading order and whole-cover policy.
- Review complete source mapping and download PDF/JSON/CSV.
Supported inputs and limits
One30MiB PDF with at most500 pages; complete outputs80MiB. This500-page limit does not change other PDF tools.
Keep visible CropBox and quarterturn-rotated page vector/image artwork. Reject encryption/signatures,annotations/interactive forms,active actions/scripts,optional layers,page-level transparency Group,non1 UserUnit,bad page trees,edges>14,400pt or nonquarterturn rotations. Original metadata/bookmarks/forms are not preserved. This is not forensic removal; cropped-out source content may remain in the output.
At most500 source pages/1000 reading pages; finite cut0<cut<1. Keeping both with a one-page source yields one whole page.
Drawing instructions total80MiB including stream separators; plain/Flate/ASCII85/ASCIIHex/RunLength page-content streams only. Reject other instruction filters and predictor/unknown decode parameters. Encoded image resources are retained and shared without image transcoding.
Worked example
Example input
Four spreads,CropBox[20,30,220,130],rotations0/90/180/270.
Example options
{"cut":0.5,"order":"left-first","keep":"none"}Example output
All8 reading pages match source visible regions; actual500-page capacity yields1000 pages.
When something does not work
Flatten unsupported interactive/layer/transparency structures in a full PDF editor and verify the source artwork. Correct settings and retry; failure/cancellation leaves no partial result.
Frequently asked questions
Is the cut before or after rotation?
Normalize the visible MediaBox/CropBox intersection and0/90/180/270 rotation first,then split the visible page vertically. Right-first changes output reading order,not the cut position.