Everyday errors
Spelling, grammar and article mistakes.
Their going to the market tomorow, and me and him will bring a umbrella. She dont like the rain…
Grammar Checker for English Writing
This grammar checker flags spelling, grammar and punctuation in a passage, one suggestion at a time. You accept or ignore each fix. Fiction mode leaves dialect and deliberate fragments alone. English only.
Your text is sent to Bookeen when you press Check, and to an AI model provider for the smart suggestions. It is not stored.
ExampleSaved example result from 2026-10-02. Press Check text to check your own text.
6 suggestions — 6 accepted
Their going→ They're going"Their" is possessive; the contraction "They're" is needed here.
Grammar · Smart
tomorow→ tomorrowCorrect the misspelling of "tomorrow".
Spelling · Smart
me and him→ he and IUse subject pronouns "he and I" as the subject.
Grammar · Smart
a→ anUse “an” before “umbrella”.
Grammar · Rule
She dont→ She doesn'tThird-person singular requires "doesn't".
Grammar · Smart
it rain→ it rainsThird-person singular verb should be "rains".
Grammar · Smart
Corrected text
They're going to the market tomorrow, and he and I will bring an umbrella. She doesn't like the rain, but it rains every day in march.
Limits and privacy
- Free, with no sign-up. English only. The shared tool limit is 6 runs a minute and 30 runs a day for each visitor.
- Spelling and basic grammar rules run on every check, up to 6,000 characters. The AI suggestions run on up to 1,000 words at a time; longer text gets the rule-based checks only.
- AI suggestions are produced by a third-party language model. Your text is sent to it only when you press Check, Bookeen does not store it, and the provider handles it under its own terms. If your text is confidential, don’t paste it.
- Every suggestion is checked against your text before it is shown: the passage has to exist exactly as quoted, and a fix that would change a number, date or name is dropped. A check does not spend Studio credits.
Try an example
Fiction with dialect
Fiction mode keeps intentional fragments and dialect.
“Ain’t no use asking,” Tom said. “Sea don’t answer.” He walked slowly. Slower than before…
Manuscript paragraph
Repeated words, spacing and punctuation.
The committee recieved the the report on friday, and it was a unusual one…
What Is a Grammar Checker?
A grammar checker reads a draft and points at spelling, grammar and punctuation that may be wrong, then lets you decide. A word processor underlines some of the same mistakes. A full writing app such as Grammarly or LanguageTool also suggests style and tone. This page stays narrower: small fixes, labelled as a rule or as a model suggestion, and nothing changes until you accept it. The hard case is fiction, where a fragment or a dialect spelling is intentional. Fiction mode is the setting for that. You can use it as a free grammar checker and as a punctuation checker for English prose.
How the Grammar Checker Works
Run the rules
Every check starts with a fixed set of high-confidence rules, before any model is asked.
- Rules catch doubled words and spaces, spacing around punctuation, “could of”, a lowercase “i”, and “a” versus “an”.
- A short list of frequent misspellings is included.
- These suggestions are labelled Rule and run up to 6,000 characters.
Ask for small edits
An AI model may propose more edits, but only on the first 1,000 words. Longer text keeps the rules only.
- Each edit must quote your text exactly and stay short.
- A change to a number, date or name is dropped.
- If a rule and a model suggestion overlap, the rule wins. Model edits are labelled Smart.
You accept or ignore
The grammar checker does not rewrite the paragraph by itself.
- Accept a fix only if the sentence still means what you meant.
- Ignore dialect, names and invented words.
- Copy the text after you have decided, or check again.
Why Use This Grammar Checker
A second pass you can refuse
Bookeen shows one suggestion at a time, keeps fiction settings separate, and drops fixes that would change a name, number or date.
A writing app does more than grammar
Grammarly and LanguageTool also coach tone and style across a document. Use them when you want that broader pass. Use this page when you want a grammar and punctuation check you can accept line by line.
Who the Grammar Checker Is For
Fiction writers
Use Fiction mode so the grammar checker does not flatten a voice.
- Keep interrupted speech and stylised repetition when they are deliberate.
- Ignore a flag on a character’s dialect.
- Never accept a change to a name by accident.
- Read the sentence after each accept.
Nonfiction authors
Use Standard when the draft should read cleanly.
- Check a chapter in pieces if it is longer than 1,000 words.
- Trust a spelling flag more than a style flag.
- Reject a change that softens a precise term.
- Copy the corrected text back into your manuscript.
Students
Use it to see mistakes, then fix them yourself.
- Follow your school’s rules on AI-assisted writing.
- Accept a spelling correction you agree with.
- Ignore a suggestion that changes your meaning.
- Do not treat the tool as a grader.
Editors
Use it as a first net, not as the edit.
- Run rules on the whole passage up to 6,000 characters.
- Review Smart suggestions only where they quote the text exactly.
- Leave voice decisions to the author.
- Recount the chapter in the word counter after the edit.
How to use the Grammar Checker
- Paste your text and choose Standard for general writing or Fiction for stories.
- Press Check text and read the list of suggestions.
- Accept the fixes that are right and ignore the rest. The corrected text updates as you decide.
- Copy the corrected text, or keep editing and check again.
How to Check the Suggestions
Read each fix in context
A checker doesn’t know what you meant. Accept a suggestion only if the corrected sentence still says what you wanted to say.
Trust spelling more than style
A misspelling is usually a clear error. Grammar and word-choice suggestions are judgement calls, so keep your own phrasing when it is deliberate.
Use Fiction mode for stories
Fiction mode keeps dialect, interrupted speech and stylised repetition. Even so, it is a guess: ignore any suggestion that flattens a character’s voice.
Names and made-up words
Character names, places and invented words can look like mistakes. Ignore those suggestions and never accept a change to a name by accident.
What the Grammar Checker Will Not Do
Rule-based checks
A built-in set of rules catches common mistakes with high confidence: doubled words and spaces, spacing around punctuation, “could of”, a lowercase “i”, “a” versus “an” and a list of frequent misspellings. They run on every check and are labelled Rule.
AI suggestions
An AI language model reads the passage and proposes small edits. Each edit must quote your text exactly, must be short, and must not change numbers, dates or names. Edits that fail these checks are dropped, and rule-based fixes win whenever two suggestions overlap. These are labelled Smart.
What it does not do
It does not rewrite your paragraphs, check facts, detect plagiarism or detect AI writing. For a heavier polish, use the AI Humanizer or the Story Writing Assistant.
Accuracy
Bookeen has tested this tool on a small set of examples, not on a published benchmark, so treat it as a second pair of eyes rather than an authority. It will miss some errors and flag some correct text.
Use the Grammar Checker with Your Draft
Microsoft Word
Paste a passage from Word when you want a second grammar pass beside Word’s own underlines.
Google Docs
Copy a section from Docs, check it here, then paste back only the fixes you accepted.
Grammarly
Use Grammarly when you want its broader style suggestions in the browser. Use this grammar checker when you want rule and model fixes you accept one by one.
Bookeen
After the grammar is settled, polish wording in the AI humanizer or keep drafting in Bookeen. A grammar check does not spend Studio credits.
Grammar Checker Compared with Other Checkers
| Tool | What it does | When to use it |
|---|---|---|
| Bookeen | Flags spelling, grammar and punctuation, with a separate fiction mode, and applies nothing until you accept it. | You want a line-by-line English check, including dialogue. |
| Grammarly | Suggests grammar, spelling, clarity and tone while you write. | You want a broader style pass in the browser or in a document. |
| LanguageTool | Checks grammar and style, including in more than one language. | You need a language this page does not check. This page is English only. |
| Microsoft Editor | Underlines grammar and spelling inside Word and the browser. | The draft already lives in Microsoft 365. |
| ProWritingAid | Reports on style, pacing and repeats in a long manuscript. | You want a manuscript report, not only a grammar pass. |
Related tools and guides
Frequently asked questions
What is a grammar checker?
A grammar checker points at spelling, grammar and punctuation that may be wrong and lets you accept or ignore each fix. This one is English only.
Is this a free grammar checker?
Yes. This free grammar checker does not ask you to sign up. It is limited to 6 runs a minute and 30 runs a day for each visitor so the tool stays available.
How does the grammar checker work?
The grammar checker runs built-in rules for common mistakes and can ask an AI model for further small edits. Each suggestion is verified against your text, and you decide which ones to accept.
Can I use it as a punctuation checker?
Yes. The punctuation checker rules include spacing around punctuation, and the model may suggest other punctuation edits. Accept only the ones that keep your meaning.
Will the grammar checker change my style?
The grammar checker suggests small fixes rather than rewriting sentences, and nothing is applied until you accept it. Ignore any suggestion that doesn’t sound like you.
Can I check fiction and dialogue?
Yes. Fiction mode tells the grammar checker to respect dialect, interrupted speech, fragments and stylised repetition. It may still flag some of them, so review each suggestion.
Which languages does the grammar checker support?
The grammar checker supports English only. Text in other languages is not reliably checked.
Is my text stored?
Bookeen does not store the text you check. The AI suggestions are produced by a third-party model provider, so don’t paste confidential text.
Why does the grammar checker flag something correct?
The grammar checker cannot know your intent, your dialect or your invented names. Ignore the suggestion. Nothing changes unless you accept it.
How accurate is it?
It has been tested on a small set of examples only, and no accuracy figure has been published. Expect it to catch many common errors and to miss or wrongly flag some.
How is this different from Grammarly?
Grammarly also suggests tone and clarity across your writing. This grammar checker stays on spelling, grammar and punctuation, and you accept each fix.
Does a grammar check spend Bookeen credits?
No. A grammar check does not spend Studio credits. Credits apply when you create a book in Bookeen.