Koharu

Koharu is a desktop application for translating manga. It offers an editable translation workflow that takes a page from import to final export, keeping source text, translations, artwork and layout together in a local project on the user's machine. The pipeline covers several stages that can be run together or one at a time. Pages are imported as images, archives or PDFs. Vision and OCR models detect and read the lettering, translation providers produce the new text, and an inpainting stage removes the original lettering and repairs the artwork. Text is then typeset with control over fonts, alignment, fill and stroke. Users can review and correct OCR, wording, names and line breaks, and finish pages with canvas tools. Output can be flattened PNG images or layered PSD files for further editing. Translation can use local models or hosted services, and the documentation notes that hosted providers receive the content needed for the requests sent. A built in assistant called Koharu Agent can inspect pages and make scoped edits after sign in. Releases are available to download for Windows, macOS and Linux, and the documentation covers hardware and runtime support. The vendor does not publish pricing on the documentation site.