Umi-OCR

PaddleOCR

PaddleOCR is an open-source OCR library built on the PaddlePaddle deep learning framework. It provides state‑of‑the‑art text detection and recognition across multiple languages and supports both image and PDF inputs. Designed for flexibility, PaddleOCR can be integrated into custom pipelines or run as a standalone service on Windows, macOS, Linux, and via web interfaces. Its self‑hosted deployment gives full control over data privacy and performance tuning.

Tesseract.js

tesseract.js is a JavaScript library that provides Optical Character Recognition (OCR) capabilities for more than 100 languages. It allows developers to extract text from images and scanned documents in a variety of languages, making it a useful tool for applications that require text recognition. The library is designed to be easy to use and integrate into web applications, and it can be used for a wide range of tasks, from simple text extraction to more complex document analysis.

OCRmyPDF

OCRmyPDF adds an OCR text layer to scanned PDF files, making them searchable. The original page images are kept intact and the recognised text is placed underneath them, so the document looks unchanged while its contents can be searched, selected and copied. It runs from the command line using the Tesseract OCR engine.

Tesseract

Tesseract is a powerful, open‑source optical character recognition engine that converts scanned images and PDFs into editable text. It supports over 100 languages and can be integrated into a wide range of applications across platforms.