KISS Translator

KISS Translator provides an open-source bilingual translation extension and Greasemonkey script.

github.com/fishjar/kiss-translator/blob/dev/RE…
KISS Translator homepage screenshot

About KISS Translator

KISS Translator is an open-source bilingual translation extension and Greasemonkey script. It displays translations alongside the original text, both on webpages and in input boxes. It can also translate YouTube subtitles and selected text, and it supports several translation services.

Site-specific translation is handled by an automatic text recognition mode, which the source says can translate most sites without written rules. A manual rule mode is available for tuning specific sites. The README recommends the browser extension over the Greasemonkey script, because the script can run into cross-domain issues and script conflicts. Optional data synchronization can use a self-hosted KISS-Worker service or WebDAV. The source says that a self-deployed service keeps data private, but it does not describe how the other translation services handle text.

Key features

  • Bilingual webpage translation with side-by-side display
  • Input-box translation through shortcut keys
  • YouTube subtitle translation shown bilingually
  • Support for Google, Microsoft, DeepL, OpenAI, Claude, Gemini and other services
  • Automatic text recognition mode, plus manual rules for specific sites
  • Optional cross-client data sync through KISS-Worker or WebDAV
Best for: Users who want bilingual translation in their browser and want to choose among several translation services.
Good for
  • Open source, with the source code available on GitHub
  • Supports multiple translation services, including custom API support
  • Automatic recognition mode works on most sites without writing rules
Watch out for
  • The Greasemonkey script version has more usage problems, such as cross-domain issues and script conflicts
  • The browser extension has more complete functions than the script, such as local language recognition and context menus
  • Self-hosted data sync must be deployed and managed by the user

KISS Translator at a glance

Type
Open-source project
Pricing
Not confirmed. Check the site
Open source
Yes · Source code
Language
English
Last checked
Oct 6, 2026 · Online when checked
Listed
Oct 5, 2026

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KISS Translator FAQ

How do I set keyboard shortcuts?
Set them on the extension management page. The README gives chrome://extensions/shortcuts for Chrome and about:addons for Firefox.
Where can I find community translation rules?
The community subscription rules are maintained in the kiss-rules repository at https://github.com/fishjar/kiss-rules.
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