Adding a blank page sounds like the most trivial thing you could do to a PDF — until you’re preparing something for double-sided printing and realise the chapters are starting on the wrong side of the paper.
Why anyone adds blank pages
The main reason is duplex printing. When you print double-sided, a section that ends on an odd page means the next section begins on the back of that sheet. In books and reports, new chapters conventionally start on a fresh right-hand page — so a blank page gets inserted to push things along.
Beyond that: leaving space for handwritten notes, separating sections, meeting a required page count for binding, or holding a spot where a page will be added later.
How to add blank pages
- Open the tool. Go to pdflu’s Add Blank Pages tool.
- Upload your PDF.
- Choose where and how many — at the start, the end, or after any page.
- Download the updated document.
Getting duplex printing right
The rule of thumb: for a new section to start on the front of a sheet, it needs to begin on an odd page number. So if a chapter ends on page 7 and the next should start fresh, insert a blank at page 8. Count through your document once and you’ll spot every place that needs one.
Tips
- New blank pages match the size of the surrounding pages automatically.
- They add almost nothing to file size — there’s no content in them.
- Insert blanks before adding page numbers, so the numbering accounts for them.
- Need finer control afterwards? Organize Pages lets you shuffle everything.
The bottom line
Adding blank pages is a small step that makes printed and bound documents look properly finished. It takes seconds and doesn’t touch the rest of your file. Try it with pdflu — free, no sign-up, entirely in your browser.
Frequently asked questions
How do I add a blank page to a PDF?
Open pdflu's Add Blank Pages tool, upload your PDF, choose where to insert and how many pages, then download the updated document.
Why would I add blank pages for double-sided printing?
When printing duplex, a section ending on an odd page means the next section starts on the back of that sheet. Inserting a blank page pushes it to a fresh front side, which is standard in book formatting.
What size will the blank pages be?
They automatically match the size of the surrounding pages, so an A4 document gets A4 blanks and a letter-size document gets letter-size blanks.
Do blank pages make the file much bigger?
No. A blank page contains no content, so it adds only a few bytes to the file.
Can I add blank pages at the start of a PDF?
Yes. You can insert at the very beginning, at the end, or after any specific page in the document.