BleachPDF vs PDFRedaction

BleachPDF is a free desktop utility for Linux and macOS that redacts sensitive information from PDF files, including scanned pages. It converts each page into an image, applies OCR to locate text you specify, covers matches with black boxes, and writes a new PDF. The resulting file contains images only, so it has no hidden text layer that could reveal redacted wording through copying and pasting. Matching can use exact text or more complex patterns, including case-insensitive rules and digit patterns. Its command line accepts a folder or file pattern for batch processing. After redaction, BleachPDF rescans the output; if matching text is still exposed, verification fails and processing stops. It runs locally without uploading documents. Installation uses pip and requires Tesseract, with OCR language selection such as eng or eng+kor. Handwriting, unusual fonts, poor scans, and tiny dense text can cause recognition errors, so manual checking is advised.

PDFRedaction is a browser-based tool for detecting and permanently removing sensitive information from documents. Its AI detection, analysis, and redaction run locally in an isolated browser context, and document content, extracted text, PII values, and redacted output are not transmitted to its servers. The service detects more than 50 types of personally identifiable information, including names, contact details, financial identifiers, and medical IDs. OCR covers scanned PDFs and image-based documents, with layout preserved in PDF output. Redaction removes sensitive text and covers it with solid black rectangles. The tool also scans PDFs for malicious elements and strips them during export. Users can add a signature image or sign on screen, then position and resize signatures or stamps in the browser. It supports PDF, image, text, and data formats. Registered users can process up to 10 documents per day on the free plan; processing pauses when the quota is reached. Professional and Enterprise plans are not currently available for purchase.