Remove Blank Pages from PDF Online Free

How to remove blank pages from a PDF

1Drop your PDF into the tool above, or click to browse your device.

2Adjust the sensitivity slider to control how aggressively the tool detects blank pages — lower values are more sensitive.

3Click "Remove Blank Pages" to analyze and clean your document. Everything runs in your browser — nothing is uploaded.

How PDFly detects blank pages

PDFly uses a sophisticated image-based detection method to identify truly empty pages. Here's how it works:

Page rendering: Each page is rendered as an image using pdf.js, the same engine used by Firefox and Chrome.

Pixel analysis: The tool scans every pixel on the page, counting how many pixels are not white (or near-white).

Threshold detection: If the number of non-white pixels falls below the sensitivity threshold, the page is marked as blank.

Automatic removal: Detected blank pages are removed, and the remaining pages are compiled into a clean PDF.

Understanding sensitivity settings

Lower sensitivity (1-10%): More aggressive. Detects pages with very minimal content as blank. Use this for documents that are mostly white with occasional small marks.

Medium sensitivity (11-25%): Balanced default. Works well for most documents — scanned files, reports, and presentations.

Higher sensitivity (26-50%): Less aggressive. Only removes pages that are completely empty. Use this if the tool is incorrectly removing pages with small watermarks or logos.

Troubleshooting

The tool detected too many pages as blank: Increase the sensitivity value (move the slider to the right). This makes the detection less aggressive.

The tool missed some blank pages: Decrease the sensitivity value (move the slider to the left). This makes the detection more sensitive.

A page with a faint watermark was removed: Increase sensitivity — faint marks should be enough to prevent removal with the right threshold.

The cleaned PDF is missing content: Check the preview before clicking Remove. If content was removed, adjust sensitivity and re-run.

Frequently asked questions

No. PDFly's blank page remover runs entirely in your browser using pdf.js and pdf-lib. Your file is read, analyzed, and made available for download without ever being sent anywhere.

A page is considered blank if it contains no visible content — no text, no images, no marks of any kind. Pages with very small marks (like a dot or watermark) may also be detected as blank depending on the sensitivity setting.

Yes! Scanned PDFs are rendered as images, and the pixel analysis works equally well on scanned pages. This is one of the most common use cases — scanners often add blank pages between double-sided scans.

You need to unlock it first using Unlock PDF if you know the password. The tool can't analyze encrypted pages directly.

Try lowering the sensitivity value (move the slider to the left). This makes the detection more aggressive and will catch pages with minimal content. The default setting (15%) works for most documents, but some files may need adjustment.

Bookmarks and links that point to pages that are kept are preserved. Links that pointed to removed blank pages will be broken, but this is usually fine since the target page no longer exists.

There's no hard limit, but since analysis runs in your browser's memory, very large files (several hundred MB) or files with hundreds of pages may be slow on phones or older computers. A desktop browser with more memory will handle larger files more comfortably.

Remove Blank Pages

Detection Settings