Dangerzone is a free, open-source tool developed by the Freedom of the Press Foundation that sanitizes potentially malicious PDFs, office documents, and images by converting them to safe PDFs.

It uses sandboxed containers with gVisor isolation to render documents as raw pixel data, destroying embedded exploits, macros, and tracking beacons before reconstructing clean output. The tool runs on Windows, macOS, and Linux, supports optional OCR for searchable text, and passed an independent security audit with no high-risk findings.