Add visible black boxes over PDF text and areas for review. This is a visual overlay; verify the export before sharing sensitive data.
Drop PDF here or click to open
Supports PDF files up to 100MB
Select the PDF with sensitive content.
Draw visible black boxes over the areas you want to mark.
Save the PDF with visual black covers and verify underlying data before sensitive sharing.
Yes. OnePDFs is free to use, requires no account, and does not add an extra OnePDFs branding watermark; watermark tools add only the watermark you choose.
Your files stay on your device and are processed locally in your browser; no upload to our PDF processing service is required. A browser copy can remain in this site's IndexedDB until you clear site data or the browser evicts it.
No. The current tool adds a visible black overlay; underlying text may remain searchable or copyable. Verify the exported PDF and do not rely on visual coverage alone for sensitive data.
Erase uses a white visual cover, while blackout uses a black cover that clearly marks reviewed content. Neither color by itself proves the underlying data was removed.