Redacta

AI-powered PDF redaction and pseudonymisation, entirely in your browser.

Describe what to redact in plain language. AI identifies it. MuPDF removes it permanently.
Your documents never leave your device.

Report Bug

How It Works

flowchart LR
    A["Upload PDF"] --> B["Describe what\nto redact"]
    B --> C["AI identifies\ntargets"]
    C --> D["MuPDF applies\nredactions"]
    D --> E["Download\nredacted PDF"]

    style A fill:#1c1c20,stroke:#d9534f,color:#e2dfd8
    style B fill:#1c1c20,stroke:#d9534f,color:#e2dfd8
    style C fill:#1c1c20,stroke:#d9534f,color:#e2dfd8
    style D fill:#1c1c20,stroke:#d9534f,color:#e2dfd8
    style E fill:#d9534f,stroke:#d9534f,color:#fff

1. Upload a PDF via drag-and-drop or file picker
2. Describe what to redact in plain language (e.g. "all personal names and phone numbers")
3. AI analyses every page and identifies exact text matches and sensitive images
4. Choose to permanently redact (black out) or pseudonymise (replace with realistic fakes)
5. Download the redacted document with original formatting preserved

Everything happens client-side. The PDF is processed by MuPDF compiled to WebAssembly, and AI providers are called directly from your browser using your own API key. No backend. No server. No data leaves your machine.

Features

Redaction & Pseudonymisation

• Natural language redaction : describe what to censor, not where it is
• Pseudonymisation mode : replace real PII with realistic fictional alternatives (names, addresses, IDs) instead of blacking out, preserving document readability
• Permanent or visual : irreversible text destruction or black-box overlays
• Image redaction : detect and redact photos, signatures, logos, and screenshots embedded in PDFs with configurable fill colours and labels

AI Models

• Multi-provider support : bring your own Gemini or OpenAI API key
• 5 models : Gemini 2.5 Flash, 3.0 Flash, 3.1 Pro · GPT-5.4, GPT-5.4 Mini
• Configurable thinking depth : minimal to high reasoning for complex documents
• Live cost estimation : token counts and USD cost displayed after each run

Workspace

• Split-pane viewer : original and redacted PDFs side by side, resizable
• Post-processing controls : adjust highlight colours, image fill, and label visibility after redaction without re-running AI
• Dark & light themes : respects system preference, toggleable
• Per-provider key management : separate API keys for each provider, stored locally

Supported Models

Quick Start

Prerequisites

• Bun (or Node.js 18+)
• A Gemini API key and/or OpenAI API key

Run locally

make setup    # Install dependencies
make dev      # Start dev server (http://localhost:5173)

Enter your API key when prompted.

Production build

make build    # TypeScript check + production build
make preview  # Build + serve locally

Architecture

graph TD
    subgraph Browser["Browser (client-side only)"]
        UI["React 19 + Vite 6"]
        subgraph Engine
            PDF["MuPDF WASM\nText extraction +\nimage detection +\nredaction"]
            AI["Provider SDK\nGemini + OpenAI\nStreaming + retry"]
            PRC["Pricing module\nOpenRouter + fallback"]
        end
        UI --> Engine
    end

    AI -->|"HTTPS"| GEMAPI["Gemini API"]
    AI -->|"HTTPS"| OAIAPI["OpenAI API"]
    PRC -->|"HTTPS"| ORAPI["OpenRouter API"]
    Browser -->|"Static files"| HOST["Any Static Host"]

    style Browser fill:#1c1c20,stroke:#30303a,color:#e2dfd8
    style Engine fill:#222228,stroke:#30303a,color:#e2dfd8
    style UI fill:#222228,stroke:#30303a,color:#e2dfd8
    style PDF fill:#222228,stroke:#d9534f,color:#e2dfd8
    style AI fill:#222228,stroke:#4285f4,color:#e2dfd8
    style PRC fill:#222228,stroke:#30303a,color:#e2dfd8
    style GEMAPI fill:#4285f4,stroke:#4285f4,color:#fff
    style OAIAPI fill:#10a37f,stroke:#10a37f,color:#fff
    style ORAPI fill:#30303a,stroke:#30303a,color:#e2dfd8
    style HOST fill:#30303a,stroke:#30303a,color:#e2dfd8

The entire application compiles to static files that can be served by any static hosting provider. There is no server-side code.

Privacy & Security

Development

Commands

Tech Stack

Project Structure

frontend/
├── public/
│   ├── brand/                 Icon + lockup SVGs (dark, light, transparent)
│   ├── favicon.svg            Browser tab icon
│   ├── apple-touch-icon.png   iOS home screen icon
│   ├── og-image.png           Social sharing preview (1200×630)
│   └── robots.txt             Crawler directives
├── src/
│   ├── engine/
│   │   ├── types.ts           Shared types, error class, image/redaction settings
│   │   ├── pdf.ts             MuPDF WASM: text extraction, image detection, redaction
│   │   ├── orchestrator.ts    Pipeline: extract → identify → redact → cost
│   │   ├── pricing.ts         OpenRouter pricing fetch + 6-hour cache
│   │   ├── providers/
│   │   │   ├── types.ts       Provider interface and model definitions
│   │   │   ├── registry.ts    Model catalog and provider factory
│   │   │   ├── shared.ts      Shared prompt building and response parsing
│   │   │   ├── gemini.ts      Google Gemini streaming client + retry
│   │   │   └── openai.ts      OpenAI HTTP client + retry
│   │   └── prompts/
│   │       ├── index.ts       Prompt selector (redaction vs pseudonymisation)
│   │       ├── redaction.ts   System prompt for PII identification
│   │       └── pseudonymisation.ts  System prompt for PII replacement
│   ├── hooks/
│   │   └── useProviderKeys.ts Per-provider localStorage key management
│   ├── api/
│   │   └── redaction.ts       Adapter: engine to UI contract
│   ├── lib/
│   │   ├── pdf-store.ts       IndexedDB PDF persistence across routes
│   │   └── utils.ts           Shared utilities (cn, etc.)
│   ├── components/
│   │   ├── Header.tsx         Navigation, Ko-fi, GitHub link, theme toggle
│   │   ├── ApiKeyModal.tsx    Multi-provider API key management
│   │   ├── PromptPanel.tsx    Prompt input, model/mode/thinking selectors
│   │   ├── PdfPanel.tsx       PDF viewer (iframe-based)
│   │   ├── ProcessingPanel.tsx  Progress indicator with scan animation
│   │   ├── ResultPanel.tsx    Results + post-processing controls
│   │   ├── RedactionWorkspace.tsx  Split-pane layout orchestration
│   │   ├── DownloadBar.tsx    Download controls
│   │   ├── RedactaLogo.tsx    SVG logo component
│   │   ├── ScanOverlay.tsx    Animated scan line effect
│   │   ├── hooks/
│   │   │   ├── use-screen-size.ts        Responsive breakpoint detection
│   │   │   └── use-debounced-dimensions.ts  Debounced resize handling
│   │   └── ui/
│   │       └── pixel-trail.tsx  Interactive cursor trail effect
│   ├── pages/
│   │   ├── LandingPage.tsx    Hero, feature pills, upload CTA, trust marquee
│   │   └── WorkspacePage.tsx  Workspace orchestration
│   ├── App.tsx                Router, theme, API key modal
│   ├── index.css              Tailwind theme tokens (dark + light)
│   └── main.tsx               Entry point
├── index.html                 Meta tags, structured data, noscript fallback
├── vite.config.ts
└── package.json
Makefile                       Dev workflow commands

License

MIT · Siddharth Khattar, 2026