Insert Blank Pages into PDF
Insert a blank page every N pages, with optional pad-to-even mode
About this tool
Insert a blank after every N original pages except the last, then optionally pad an odd result. A blank inherits MediaBox, CropBox, BleedBox, TrimBox, ArtBox, rotation and UserUnit from its predecessor. One PDF with 1–80 pages and up to 20 MiB. One output PDF, up to 160 pages and 100 MiB. Forms, XFA, widgets, signature permissions and portfolios are rejected. Digital signatures do not remain valid; outlines, attachments and cross-page destinations are not rebuilt. Review ordinary annotations after downloading. PDF content is processed locally, with manual downloads after the complete operation succeeds.
Suggested Workflow
Scenario Recipes
Prepare duplex spacing without changing visible paper size
Goal: Intervals count original pages. No interval blank is inserted after the final original page; optional parity padding is calculated after all interval blanks.
- Open a mixed portrait/landscape PDF and choose the whole-number interval 2.
- Enable end padding if the finished document must have an even page count.
- Review the blank positions and physical sizes, then generate and inspect print preview after downloading.
Result: New PDFs match the reviewed source-page mapping and are downloaded manually for inspection.
Failure Clinic (Common Pitfalls)
A rotated page looks larger than its MediaBox dimensions
Cause: CropBox, rotation and UserUnit jointly define the visible physical page.
Fix: Check the source and inserted blank in the same viewer. The blank copies geometry only, with no source content or annotations.
Generated files disappear after a change
Cause: Output bytes belong to the source files and settings used to create them.
Fix: Review and generate again after changing options, order, sources, clearing or switching language. Old downloads do not continue.
A form or signed document is rejected
Cause: Forms, XFA, widget annotations, signature permissions and portfolios are rejected. Page copying does not preserve valid digital signatures or rebuild outlines, attachments and cross-page destinations. Ordinary annotations need output review.
Fix: Use an export or flattening workflow that explicitly supports those features, and retain the original document.
Production Snippets
Prepare duplex spacing without changing visible paper size
text
Input: A1,A2,A3,A4,A5,A6
Interval: 2 original pages; pad: yes
→ A1,A2,blank(after A2),A3,A4,blank(after A4),A5,A6
Each blank inherits the preceding page boxes, Rotate and UserUnit.Frequently Asked Questions
Does the interval count inserted blanks?
No. It counts original pages only and skips interval insertion after the final original page. Optional end padding is then based on the finished page count.
Will blanks match rotated or cropped pages?
Each blank inherits MediaBox, CropBox, BleedBox, TrimBox, ArtBox, rotation and UserUnit from the immediately preceding original page. It receives no content or annotations.
Why does interval 2.5 fail?
An interval must be a decimal positive integer within the original page count. Fractions and exponent notation do not define an original-page spacing rule.
What are this tool’s file and page limits?
One PDF with 1–80 pages and up to 20 MiB. One output PDF, up to 160 pages and 100 MiB.
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