A handy tool to check American English grammar inside your browser. Once the app is ready and fully loaded, write a text or drag and drop a .txt file within the text area on the left. Wait for the grammar check to complete, then see all the suggestions on the right side. This app does NOT use any server(s) to check the grammar, everything happens inside your browser.
This web application is designed to perform grammar check for American English text within your browser. It uses Harper.js javascript project. Currently, it supports the American English language only, but in the future support for other languages may be added. Since this app uses the Harper engine which is loaded locally in your browser, it does NOT rely on any external servers to send/receive the input text for grammar check. Therefore it is best in terms of privacy and security concerns. Once the app is fully loaded and harper.js is downloaded in your browser, you can disconnect from the internet and still run the grammar check. Moreover, this app performs the grammar check very fast, indeed, faster than many commercial grammar check engines thanks to the Haper engine performance and lightness.
As mentioned above, this app uses the Harper.js project to perform grammar checks. According to our tests, it is very fast for a reasonable length text (a page or two). But, if the input text is too large, the app performance decreases. So it is recommended to check grammar for a large text, step by step in short portions. Moreover, this is still a work in progress and might have some bugs, so please be aware that all the grammar suggestions might not be very accurate, or even, it may not be able to catch a grammatical error. In the future, when the Harper project gets updated, this app will be updated as well.
Grammar Checker app is also available as a browser extension. As an extension, this app does not need an internet connection and can be used offline in your browser. Download links for three popular browsers are as follows: Chrome, Opera, Firefox.
If you found a bug in this page, or have a feature/function which you would like to see in this web app, please let us know by sending an email or through the discussion form below. Moreover, don't forget to check other web apps in webbrowsertools.com, we have many useful apps related to browser's privacy and security.