Lund Info AB

Local grammar, spelling and style checking in web text fields. Nothing you type leaves your machine.

LingoTweaker proofreads the text you type on the web — plain input fields, contenteditable areas, and rich-text editors — with the open LingoTweaker engine compiled to WebAssembly. Private by design. The engine and all language data run on your own machine inside the extension. No text is sent anywhere: there are no analytics, no remote API calls and no accounts. The extension makes zero network requests while checking. Features - Grammar, spelling and style checks with suggestions, in 38 languages. - Click an underline for a suggestion card: apply a fix, add a word to your personal dictionary, ignore a rule, or disable the extension per site. - Pick the checking language per site, or switch quickly with a keyboard shortcut. - Editor-aware corrections that keep bold, italic and links intact. - Opt-in deep integrations for Google Docs, Microsoft Word online, Fidus Writer and Gmail (off by default; enable in settings, then reload the editor tab). - LingoTweaker Plus (optional, paid on our website): a different checking language per chat/channel/email conversation, and the Slack integration. Plus keys are verified offline — the extension still makes zero network requests.