How to Remove Blank Pages from a PDF Free — Complete Guide 2026

Scanning a double-sided document with a single-sided scanner produces a PDF that alternates between real content and blank pages — the scanner captures an image of the empty back of each sheet the same as any other page. The result is a PDF twice as long as it needs to be, harder to navigate, and larger than necessary to store or share.

This guide explains every free method to remove blank pages from a PDF in 2026 — identifying them visually, deleting them manually, and cleaning up scanned documents before sharing or archiving.

Why Scanned PDFs Contain Blank Pages

Most flatbed and sheet-fed scanners default to double-sided (duplex) scanning, which captures both the front and back of every sheet fed through the scanner. If the original document is printed on only one side of each page — which is common for letters, forms, and most everyday paperwork — every second page captured by the scanner is blank.

This happens even when the scanner is set correctly, because the software has no way of knowing in advance which pages are blank. It simply captures whatever is on both sides of the paper. The result is a PDF where every other page is empty, doubling the page count and file size without adding any content.

Phone-based scanning apps can produce a similar issue if pages are scanned individually and a blank cover sheet or divider page is accidentally included.

Method 1 — Remove Blank Pages on Mac Using Preview (Free, Built-in)

Mac's Preview app is the fastest free method for removing blank pages, because you can see thumbnails of every page at once and identify blanks visually.

Open the PDF in Preview. Go to View in the menu bar and choose Thumbnails to display the page panel on the left side of the window. Scroll through the thumbnails — blank pages appear as plain white rectangles with no visible content, making them easy to spot at a glance.

Click on the first blank page thumbnail. Hold Command and click each additional blank page thumbnail to select them all at once. Once every blank page is selected, press the Delete key on your keyboard. The selected pages disappear from the thumbnail panel.

Go to File and choose Export as PDF to save the cleaned document as a new file. Do not use Save alone — Export as PDF guarantees the deletions are embedded permanently in the saved file.

Method 2 — Remove Blank Pages Using Our Delete PDF Pages Tool (Any Device)

If you already know which page numbers are blank — for example, you can see from a quick scroll that pages 2, 4, and 6 are empty — our Delete PDF Pages tool removes them in seconds on any device, including Windows and mobile, where built-in tools are more limited.

Open the Delete PDF Pages tool, upload your scanned PDF, and enter the page numbers to remove — for example, 2,4,6,8 for alternating blank pages, or a range like 10-14 for a consecutive block of blanks. Click Delete & Download to get your cleaned file immediately.

This method is particularly useful when the blank pages follow a predictable pattern, such as every even-numbered page in a duplex scan — you can enter the entire pattern in one go rather than deleting pages individually.

Method 3 — Identify Blank Pages Before Removing Them

Before removing pages, it helps to confirm which pages are actually blank rather than pages with very light or faint content that could be mistaken for empty.

Zoom in on any page that looks blank in the thumbnail view — sometimes faint watermarks, page numbers, or light-coloured stamps are present but not visible at thumbnail size. On Mac, click a thumbnail and use Command and Plus to zoom in on the full page before deciding to delete it.

If you are working with a very long scanned document — dozens or hundreds of pages — scroll through the thumbnail panel systematically from the first page to the last, noting the page numbers of every blank page before starting to delete, rather than trying to identify and delete each one individually as you go.

Method 4 — Remove Blank Pages on Windows

Windows does not include a built-in tool for reviewing PDF thumbnails and deleting pages the way Preview does on Mac. The most practical free approach is our Delete PDF Pages tool.

Open the PDF in Chrome or Edge first to review the pages and note which page numbers are blank. Then open our Delete PDF Pages tool, upload the same PDF, and enter the blank page numbers to remove. Download the cleaned result.

Alternatively, Chrome's print-to-PDF function can extract only the non-blank pages: press Ctrl and P, select Save as PDF, and in the Pages field enter only the pages you want to keep — for example, 1,3,5,7 to keep only the odd-numbered pages from a duplex scan with blanks on every even page.

Method 5 — Remove Blank Pages on iPhone and iPad

On iPhone and iPad, open the scanned PDF in the Files app and scroll through the pages to identify blanks. Note the page numbers.

Use our Delete PDF Pages tool in Safari — upload your PDF, enter the blank page numbers, and download the cleaned file. This works identically to the desktop version and requires no app download.

For documents you are scanning yourself using the Notes app scanner, review each page immediately after scanning and delete any accidental blank captures before saving the final PDF, which avoids the cleanup step entirely.

Method 6 — Remove Blank Pages on Android

Open the scanned PDF in Chrome or Google Drive on your Android device to review the pages. Use our Delete PDF Pages tool in Chrome for Android — upload your file, enter the blank page numbers, and download the result.

If you are scanning documents using Google Drive's built-in scanner on Android, review each captured page before saving and remove any blank captures immediately during the scanning process.

How to Prevent Blank Pages When Scanning

The most efficient long-term fix is to prevent blank pages from being captured in the first place, rather than removing them after scanning.

If your scanner or scanning app has a duplex setting, check whether it can detect blank pages automatically and skip them — many modern scanners and scanning apps, including Google Drive's mobile scanner, offer this as an option. If your document is genuinely single-sided, switch the scanner to single-sided (simplex) mode instead of duplex, which avoids capturing the blank reverse side entirely.

When photographing documents with your phone using our Image to PDF tool, only photograph pages that actually contain content — there is no need to capture blank backs of single-sided pages at all.

What to Do After Removing Blank Pages

Once blank pages are removed, your PDF is smaller and easier to navigate. If the file is still larger than you need for email or upload, use our Compress PDF tool to reduce it further.

If you need to combine the cleaned document with other files — for example, attaching it to a cover letter or application form — use our Merge PDF tool to join them into one organised submission.

If the scanned pages also came out rotated or sideways, use our Rotate PDF tool to fix the orientation before finalising the document.

Frequently Asked Questions

How do I remove blank pages from a scanned PDF for free?

Use our Delete PDF Pages tool — upload your PDF, enter the page numbers of the blank pages, and download the cleaned file. On Mac, Preview also lets you select blank page thumbnails visually and delete them directly.

How do I find which pages are blank in a long scanned PDF?

Open the PDF in Preview on Mac or Chrome on any device and scroll through the page thumbnails — blank pages appear as plain white rectangles. Note the page numbers before deleting.

Can I remove blank pages automatically without checking each one?

If the blank pages follow a predictable pattern — such as every even-numbered page from a duplex scan — you can enter the full pattern (e.g. 2,4,6,8,10) into our Delete PDF Pages tool in one step rather than checking each page individually.

Does removing blank pages reduce my scanned PDF's file size?

Yes. Removing blank pages reduces the page count directly, which reduces the overall file size proportionally. For further reduction, compress the cleaned file using our Compress PDF tool.

How do I stop my scanner from creating blank pages in the first place?

Check whether your scanner or scanning app has an automatic blank page detection setting, or switch from duplex (double-sided) to simplex (single-sided) scanning mode if your original documents are printed on only one side.

Can I remove blank pages on my phone for free?

Yes. Our Delete PDF Pages tool works in Safari on iPhone and Chrome on Android without any app download.