Koharu is a Rust-based desktop application that provides a complete local pipeline for translating manga. It integrates OCR for text detection, inpainting for cleanup, and supports both local and remote LLMs for translation, along with text rendering for vertical CJK layouts. Users can run it with a GUI, headless for batch processing, or via Web UI and MCP for automation, making it suitable for private, production-grade manga localization on Windows, macOS, and Linux.
Koharu is an AI & ML product. It focuses on translating manga pages locally without relying on cloud services or manual editing tools. Koharu is an open-source project aimed at manga translators and enthusiasts. The project is open source (GPL-3.0). Koharu is available on the web, macOS, Windows, Linux, and the command line, and it can be self-hosted.
mayocream builds and maintains Koharu, and the product first shipped in 2025. The project is developed in the open on GitHub with 4.9k stars and 199 commits in the last 90 days. Among its 7 catalogued features are OCR Translation, inpainting, and Local LLM. The interface is available in 4 languages, including English, Japanese, and Portuguese. It exposes integrations via an MCP server and a public API.
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Automated Manga translation local pipeline verified by the PulseGate indexer
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