Black out sensitive text, credit card details, signatures, or personal data. FileSwift flattens each page into a secure image structure before export, making it mathematically impossible to recover or copy the text behind the redaction marks.
Upload your PDF below. Click and drag over any page preview to draw multiple blackout redaction boxes.
In standard vector PDFs, simply drawing a black rectangle over text only hides it visually. The underlying characters still exist in the file stream, meaning anyone can copy, paste, or search the redacted text. By converting each page into a flattened image, the text characters are permanently destroyed and replaced by solid pixels. This is the only method to guarantee absolute safety.
No. Once the document is flattened and downloaded, the text beneath your black boxes is permanently erased. No software, search tool, or hacker can retrieve it, because the characters no longer exist in the file.
No. Like all FileSwift tools, the entire redaction pipeline runs offline inside your browser. No files are uploaded to any server.