How to Prevent Random Black Boxes When Applying Redactions in Acrobat
Question details
The user wants to prevent unexpected random black boxes from appearing throughout a PDF document when applying redactions in Adobe Acrobat Pro 2017.
- Product
- Adobe Acrobat Pro 2017
- Device & OS
- not provided
- Scenario
- Applying redactions to sensitive information in a PDF document.
- Observed behavior
- Acrobat randomly generates unexpected black boxes across the document after the redactions are applied.
Always create a backup copy of your original PDF document before applying redactions or attempting to fix formatting errors. This ensures your source data remains intact if further visual corruption occurs.
Optimize and Test on a Clean PDF Copy
Re-optimizing the PDF or recreating it can clear hidden formatting conflicts, digital signatures, or OCR artifacts causing the random black boxes.
PDFs that have been heavily edited, scanned, OCR-processed, or digitally signed contain complex hidden layers. The redaction tool can sometimes misinterpret these layers, resulting in graphical glitches.
Go to 'Help' > 'Check for Updates' in Adobe Acrobat to ensure you have the latest patches installed, as older versions like 2017 may have unpatched bugs.
Open your original PDF and navigate to 'File' > 'Save As' to create a clean working copy of the document.
Go to 'File' > 'Save as Other' > 'Optimized PDF' to compress the file and clear out hidden meta-data, tags, or conflicting artifacts.
Use the Redact tool on this newly optimized copy to check if the redactions apply smoothly without generating the random black boxes.
Flatten the Document via Print to PDF
Flattening the document removes complex layers, interactive elements, and hidden text layers that might trigger visual glitches during redaction.
Redact PDFs Smoothly with WPS Office
Avoid unexpected black boxes and formatting glitches by using WPS Office's built-in PDF editor. It offers a lightweight, reliable, and secure way to hide sensitive information without corrupting your documents.
- 1. Open PDF in WPS Office: Launch WPS Office and open your PDF file using the integrated WPS PDF tool.
- 2. Access the Redaction Tool: Navigate to the 'Protect' tab on the top ribbon and click on the 'Redact' tool.
- 3. Mark and Apply Redactions: Highlight the text or select the area you want to hide, then click 'Apply Redactions' to permanently and safely remove the sensitive data.
Frequently Asked Questions
Why does Acrobat add random black boxes during redaction?
This usually happens due to conflicting document layers, OCR (Optical Character Recognition) artifacts, or bugs within specific versions like Acrobat Pro 2017. Complex vector graphics and hidden tags can also trigger this rendering glitch.
Can I remove the random black boxes once they appear?
If the redactions have already been applied and the document has been saved, the changes are permanent. You will need to revert to your original, unedited backup and apply redactions to a fresh, optimized copy.
Does OCR processing affect PDF redaction?
Yes. Hidden text layers generated by OCR can sometimes misalign with the visible text in the document. When you attempt to redact text, the software might misinterpret the boundaries of these invisible layers, causing unexpected black boxes across the page.
How do I ensure my PDF redactions are completely secure?
Always use dedicated redaction tools found in software like WPS PDF or Adobe Acrobat. Never rely on simply drawing black rectangles or highlighting text in black, as the underlying data remains intact and can still be copied, searched, and read by others.
