Mouse Tooltip Translator is an open-source browser translation extension that translates hovered text across languages. It also supports OCR, PDF and ebook translation, dual subtitles, dictionary lookups, text-to-speech, and translation in web services such as Google Docs and Gmail.
In the Text translation space, Mouse Tooltip Translator takes a focused approach. It focuses on translating text, images, documents, and subtitles without leaving the current webpage or application. It is built as an open-source project for language learners, translators, and multilingual web users. Mouse Tooltip Translator is open source under the Open Source license. It ships for the web, the command line, and embeddable surfaces, and it can be self-hosted.
Behind Mouse Tooltip Translator is SGpirr, and it first shipped in 2025. Among its 10 catalogued features are hover translation, OCR translation, and PDF translation.
Summary written by a language model from the project’s public pages.
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