Introduction

PreOCR is an open-source Python OCR detection and document extraction library. It determines whether documents need OCR before you run expensive processing. Analyze PDFs, Office documents (DOCX, PPTX, XLSX), images, and text files to detect if they're already machine-readable—helping you skip OCR for 50–70% of documents and cut costs.

Use PreOCR to filter documents before Tesseract, AWS Textract, Google Vision, Azure Document Intelligence, or MinerU. Works offline, CPU-only, with 92–95% accuracy (100% on validation benchmark).