How to remove blank pages from a PDF
- Drop your PDF into the tool above, or click to browse your device.
- Adjust the sensitivity slider to control how aggressively the tool detects blank pages — lower values are more sensitive.
- Click "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.
When to remove blank pages
- Scanned documents: Scanners often insert blank pages between double-sided scans.
- Exported presentations: PowerPoint exports can include trailing blank slides.
- PDF conversions: Converting from Word or other formats sometimes adds blank pages.
- Email attachments: Reduce file size by removing empty pages before sending.
Before you remove blank pages
- Check preview: Review the detected blank pages preview to ensure no important pages are marked for removal.
- Adjust sensitivity: If pages with logos or watermarks are being detected as blank, increase the sensitivity value.
- Keep a backup: Always keep the original file in case you need to restore removed pages.
Common mistakes
- Setting sensitivity too low, causing pages with small logos or page numbers to be removed incorrectly.
- Setting sensitivity too high, missing blank pages that should be removed.
- Deleting the original before checking that the cleaned PDF opens correctly.
- Assuming all white pages are blank — some pages may have white text or images that are invisible to the eye but present in the PDF.
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.