Redacta review
A free, open-source browser tool for natural-language PDF redaction.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Redacta is a free, open-source web tool for removing or replacing sensitive information in PDF documents. It is aimed at individuals and teams that need browser-based redaction without signup, installation, subscriptions, or watermarks. Users describe what to remove in natural language, while AI helps identify personally identifiable information, matching text, and sensitive images. The tool supports permanent text redaction, pseudonymisation with fictional replacements, and a side-by-side viewer for comparing the original and redacted documents.
The product’s strongest fit is its focused redaction workflow. PDF formatting and layout are preserved, and embedded images can be detected and redacted alongside text. Processing runs client-side in the browser through WebAssembly, which suits users who want document handling to occur locally rather than sending the PDF itself through a conventional hosted processing workflow. Redacta also supports Google Gemini and OpenAI through a bring-your-own-key model, giving users a choice of supported AI providers while keeping the product free to access.
The free model is straightforward, but AI-assisted use can introduce separate costs from the selected provider. Bringing a Gemini or OpenAI API key also makes provider configuration part of the workflow. Redacta is therefore a strong choice for free, natural-language PDF redaction with layout preservation, image handling, and pseudonymisation. It is less suited to teams looking for a broader document-processing platform beyond PDF or wanting AI usage managed without their own provider account and billing.
Redacta pros and cons
- Where it wins
- Plain-language instructions for redaction and pseudonymisation
- Client-side processing with WebAssembly and preserved PDF layout
- Detects PII, sensitive images, and embedded image content
- Where it doesn't
- Supports PDF input rather than a broader range of document formats
- AI-provider API costs may apply when using Gemini or OpenAI
- Bringing an API key adds setup responsibility for AI-assisted workflows
Redacta fact sheet, pricing and score →
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