github.com
KISS Translator is a simple, open-source bilingual translation extension and userscript. It supports bilingual webpage translation, input-field translation, selection word lookup, and mouse-hover translation, and includes YouTube bilingual subtitles with configurable subtitle styles. It lists built-in services such as Google, Microsoft, Baidu, Tencent, DeepL, OpenAI, Gemini, Claude, Ollama, and DeepSeek. The README notes that provider plugins, Local AI, file translation, and automatic clipboard translation are available only in the Chrome/Edge and Firefox extension builds, not in userscripts and other clients.