How content is removed
Every page is rendered, then selected pixels are replaced with opaque black before embedding in a fresh PDF. Original text layers, attachments, scripts and metadata are not copied. The black areas belong to the image itself and are not removable PDF overlays.
All pages become images. Selectable text, accessibility tags, forms, links and digital signatures are lost. Unmarked visible information remains visible. Mark the entire value generously, including repeated values.
Review the download
Compare every page and open the downloaded copy in a local PDF viewer. Keep the original. Password-protected PDFs cannot be opened here. Limits: 30 MB input, 50 pages, additional pixel and output-size limits. Output may grow.