Redacta

What Redacta is

Redacta is a free, open-source web tool for removing or pseudonymising sensitive information in PDF documents using plain-language instructions. It can detect personal details such as names, email addresses, phone numbers, Social Security numbers, addresses, and account numbers, then permanently redact them. It can also find images inside PDFs, including photos, signatures, logos, and screenshots. For pseudonymisation, it substitutes realistic fictional details for real names, addresses, and identifiers while keeping the document readable. Redacta says output PDFs retain their formatting, layout, fonts, and page structure. PDF parsing and redaction run in the browser with WebAssembly and MuPDF, and the site says PDF files are not uploaded to a server. AI processing requires your own Google Gemini or OpenAI API key, with requests sent directly from the browser to the provider. One privacy distinction is that the free trial tier routes extracted text through a backend proxy. The tool requires no signup or installation, adds no watermarks, and has no usage limits; API charges from your key are your responsibility. Listed use cases include legal, HR, healthcare, finance, university, and research settings.