About

Grammar Checker is a free grammar checker. It runs in your browser: open the page, enter your figures and get the answer straight away, with the working shown.

How the tool is checked

Before an update is published, the tool runs through 129 automated checks in a real browser: worked examples are recalculated, edge cases and wrong input are tried, and the layout is checked on desktop and on a phone.

References

Explanations are based on primary sources and recognised references, which are linked in the text.

Our approach

The editorial team writes for one reader: someone who needs a reliable answer now. That means worked examples, units spelled out, honest limits and no sponsored recommendations.

Found a mistake?

Published October 9, 2026, last reviewed October 12, 2026. Corrections are welcome via the contact page; confirmed fixes go out with the next update.

How the site is paid for

Advertising keeps the site free. Ads are kept separate from results and do not influence what the tool shows.

— Grammar Checker editorial team