Modufile's Redact PDF tool performs true, permanent redaction — it physically removes the underlying text and image data from the PDF content stream using the MuPDF engine compiled to WebAssembly. Unlike simple black-box overlays that can be removed, Modufile's redaction makes the content unrecoverable by any tool. You can draw redaction boxes manually on any page or use the Find & Redact feature to search for specific text and redact all occurrences at once. The entire process runs locally in your browser, so sensitive documents are never uploaded to a server. This makes it a strong alternative to paid tools like Adobe Acrobat's redaction tool, offering a free, privacy-focused PDF redaction tool for anyone who needs to black out text, remove personal information, or permanently redact sensitive data in a PDF.