PDF Contract Redactor

Redact sensitive values from scanned PDF contracts while preserving field names.

What It Does

1. OCR Recognition: Uses Alibaba Cloud OCR to extract text and positions from scanned PDFs
2. Field-Value Matching: Finds field names (e.g., "合同金额") and their corresponding values (e.g., "45640元")
3. Selective Redaction: Covers only the values with black boxes, keeping field names readable

Workflow

Step 1: PDF to Images

Convert PDF pages to high-resolution PNG images (200 DPI) for OCR.