How to fix grammar in any app

Last updated: June 2026

To fix grammar in any app on macOS, Windows or Linux, install a system-wide tool like Polish, select the text, and press Ctrl/⌘+Shift+F. The corrected text replaces your selection in place, in email, Slack, Notion, Word, VS Code or anywhere else, with no browser extension, no account, and an offline option. Here is the full workflow.

TL;DR: Select text, press Ctrl/⌘+Shift+F, and the fix appears where you were typing. Works in any app, even offline, with no account.

Why most grammar checkers fall short

Browser extensions only help inside the browser, and built-in spell-check misses grammar, tone and punctuation. The text you write in chat apps, code comments, terminals and native editors usually goes unchecked. A system-wide fixer closes that gap because it works at the operating-system level, not inside one app, so the same shortcut corrects your writing everywhere.

Fix grammar everywhere, step by step

Install Polish on macOS, Windows or Linux. No sign-up: your license key lives in the OS keychain.
Select the sentence or paragraph you want to correct, in any app.
Press Ctrl/⌘+Shift+F to fix grammar and spelling instantly, or Ctrl/⌘+Space to choose another action like Rewrite or Translate.
The corrected text replaces your selection in place, keeping you in your flow.

Prefer fixing the sentence you are in without selecting it first? The Quickfixer can correct the sentence around your cursor automatically, so you do not even have to highlight it.

Where it works

Email and messaging. Mail, Outlook, Gmail in the browser, Slack, Messages, Teams.
Docs and notes. Word, Google Docs, Notion, Obsidian, Apple Notes.
Code and terminals. VS Code comments, commit messages, terminal text.
Any other app with editable text, because Polish runs system-wide rather than as a browser extension.

Private and offline by design

In Local mode, grammar fixing runs entirely on your device with an on-device model (Gemma 3, Qwen 2.5 or Phi-4 Mini) and no network, so it also works on a plane or behind a firewall. In cloud mode, text is processed under Zero Data Retention: never stored, never logged, never used for training. There is no account and nothing to sign up for. You can also bring your own API key if you prefer your own provider.

More than grammar

Once Polish is set up, the same shortcut workflow does far more than fix typos. Rewrite for tone (clearer, shorter, more formal, more confident), translate across 50+ languages, summarize a long message, turn notes into a bullet list or a Markdown table, or ask a question about the selected text. It is one tool that replaces a grammar checker, a paraphraser, a translator and a chatbot.

Fix grammar anywhere, free

One shortcut, every app, even offline, on Mac, Windows and Linux. 20 free fixes a month, no account.

Download Polish See pricing

Frequently asked questions

How do I fix grammar in any app on Mac, Windows or Linux?

Install a system-wide tool like Polish. Select the text, press Ctrl/⌘+Shift+F, and the corrected version replaces your selection in place. It works in any app because it uses the operating system rather than a browser extension.

Can I fix grammar without a browser extension?

Yes. Polish is a native desktop app, not an extension, so it corrects grammar in native apps like Mail, Messages, Slack, Notion, Word and VS Code as well as in the browser.

Is there an offline grammar fixer?

Yes. Polish has a Local mode that runs an on-device model, so it can fix grammar with no internet connection and without sending your text anywhere.

Does it work in other languages?

Yes. Fix works in any language the underlying model supports, and Polish can also translate between 50+ languages from the same shortcut menu.

Can I fix the sentence I am typing without selecting it?

Yes. The Quickfixer can correct the sentence around your cursor automatically, so you do not have to highlight the text first.

Do I need an account to fix grammar with Polish?

No. There is no sign-up. Your license key is stored in your OS keychain, and the free tier of 20 transformations a month needs no card and no account.

Is it free to fix grammar this way?

Polish includes a free tier of 20 transformations a month. For unlimited use, plans start at $4/month (billed yearly), or you can bring your own API key.