Grammar checker
Check English grammar, spelling and punctuation with Harper on your device, choosing each fix. Free, with no account or uploads.
Check the grammar of your text
Paste or type in English. Each problem is shown with its fixes, and nothing changes until you choose one.
Nothing yet: paste, type or open a file.
Spelling, grammar and punctuation in English are checked on this device by Harper. The checker (8 MB) is fetched once from this site when you press Check; nothing you write is sent anywhere.
English only. Harper is a set of rules, not a person: it can flag what is right and miss what is wrong, and it does not rewrite your style.
A little help along the way
Follow these steps. Every option is explained underneath. Everything happens in your browser; nothing you write is sent anywhere or kept.
- Put your text in the boxPaste or type it, or press Open file for a .txt, .md or Word (.docx) file, or drop the file on the box. A line under the box says, as you write, how many words it has and how long it takes to read and to say aloud.
- Say what you want to doChoose an answer to “What do you want to do with your text?”: Count it, Change capitals, Compare two texts, Tidy it up, Sort lines, Find and replace, or Placeholder text. Its panel opens beside the text on a computer and under it on a phone.
- Count itSee words, characters with and without spaces, sentences, paragraphs and lines. Turn on Check a limit to see how much is left of an X post, a text message, a search description or a word target you set.
- Change capitalsChoose UPPER CASE, lower case, Sentence case or Title Case (with its style guide: APA, AP, Chicago or MLA). The panel shows the first line as it will be, and the button changes the whole text.
- Compare two textsPaste the first version in the first box and the second in the second. The page says how many words were added and taken out and shows both texts with what was added underlined and what was taken out struck through, side by side or in one.
- Tidy, sort, or find and replaceEach panel says first what it will do (“Take out 14 line breaks and 3 double spaces”), then one press does it. Preview the change shows the text before and after with every change marked.
- Undo, copy or downloadEvery change is one step: the Undo arrow puts the text back and the Redo arrow does the change again. Copy text puts the text on the clipboard, and the download arrow saves it as a .txt file.
Questions people ask
- Is my text uploaded to check it?
- No. Harper runs in your browser from a file this site sends once (8 MB), and your text never leaves your device or is kept.
- Does it change my text by itself?
- No. Each problem is shown with its fixes, and only the fix you press is made, as one step that Undo takes back.
- How good is it?
- Harper is a set of rules for English: fast and private, but it catches fewer problems than the large online checkers and can flag what is right, so read your text over too.
This page is the Text tools, opened for this one job; every other tool it has is one press away. Each of its settings is explained on the Text tools's own page.
Read the step-by-step guideKeep going
Guides
- Free grammar checker that does not upload your text
- Free text tools: word counter, case converter, diff checker
- How to count words, characters and reading time
- Character counter for X posts, text messages and meta tags
- Title case converter: AP, APA, Chicago and MLA style
- Diff checker: compare two texts and find the differences
- How to remove line breaks from text copied from a PDF
- How to remove duplicate lines from a list