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Free grammar checker for academic writing

Paste your essay, report or dissertation chapter and see spelling, grammar, punctuation and academic tone issues highlighted as you type. No sign-up, and your text never leaves your browser.

  • Checks as you type
  • Private: runs in your browser
  • UK and US English

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Grammar checker

Paste your text to check it

Nothing is uploaded. The check runs on your device.

0 / 3,000 words0 characters0 sentencesStays in your browser

Human proofreading

Get every error fixed by a subject editor

A checker finds the obvious slips. An editor who knows your subject also fixes unclear sentences, weak structure and referencing errors, and tells you why.

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  • Every line checked

    Grammar, spelling and punctuation corrected throughout, not just the common slips.

  • Clarity and flow

    Unclear sentences rewritten and paragraphs tightened so the argument reads cleanly.

  • Referencing

    Citations and the reference list checked against Harvard, APA, OSCOLA or your style.

  • Tracked changes

    Every edit visible with comments, so you learn from the corrections.

What it checks

Built for the mistakes that cost marks

A general spellchecker ignores academic tone. This one is tuned to the slips markers see most often in student work.

  • Spelling

    Commonly misspelt academic words such as “recieve” and “seperate”, plus UK or US spellings that do not match the English you choose.

  • Grammar

    The slips that cost marks: “could of”, “their is”, “more then”, subject and verb agreement, a and an, and repeated words.

  • Punctuation

    Missing apostrophes, spaces before commas, missing spaces after full stops, and sentences that do not start with a capital.

  • Academic tone

    Contractions, informal words like “a lot of” and “basically”, personal opinion phrases, and conversational sentence openers.

  • Concise writing

    Wordy phrases such as “due to the fact that” and “in order to”, with shorter alternatives that keep your word count working.

  • Assignment standards

    The checks a marker applies: citations, paragraphing, sentence rhythm, hedging, and generic phrasing typical of AI-written text.

How to use it

Three steps, under a minute

No account, no upload, no waiting for a report.

  1. 01

    Paste your text

    Copy up to 3,000 words from Word, Google Docs or your notes into the checker, or try the sample to see how it works.

  2. 02

    Review the highlights

    Issues are underlined by type. Your score and the most important fixes appear beside the text, with a suggested correction.

  3. 03

    Fix, or get it proofread

    Apply suggestions with one tap. For work that matters, send the document to a human editor who checks everything else too.

Honest limits

Grammar checker or human proofreader?

Use the checker for a quick clean-up. For assessed work, an editor catches what software cannot.

What gets checkedFree checkerHuman editor
Common spelling and grammar slips
Academic tone and wordy phrasing
UK or US spelling consistency
Whether a sentence says what you mean
Structure, flow and paragraph logic
Referencing style and citation accuracy
Subject terminology used correctly
Feedback against your marking rubric

Grammar guide

A practical guide to grammar in academic writing

Why accuracy matters, what software can and cannot judge, the tone markers expect, and how to proofread your own work.

01Why grammar matters in academic writing

Most marking rubrics give a share of the grade to written communication, often labelled presentation, clarity or academic style. Grammar errors cost marks directly there, but they also cost marks indirectly: a marker who has to reread a sentence to work out what it means is less likely to credit the point it was making.

Accuracy also signals care. A well-argued essay with frequent slips reads as rushed, and markers notice when the same mistake appears on every page. Fixing the mechanical errors lets the quality of your argument come through.

  • Clear sentences make your argument easier to follow and easier to credit.
  • Consistent spelling and punctuation show attention to detail, which rubrics reward.
  • An appropriate academic tone shows you understand the conventions of your discipline.
  • Fewer errors mean feedback focuses on your ideas rather than your mechanics.

02What a grammar checker can and cannot do

This checker applies clear rules to your text: known misspellings, common grammar confusions such as then and than or could of, punctuation spacing, contractions and informal words, and document-level standards such as citations, paragraphing and sentence rhythm. Because every rule is explicit, it rarely flags something that is actually correct.

What no rule set can judge is meaning. It cannot tell whether a sentence says what you intended, whether your paragraphs follow a logical order, whether a technical term is used correctly in your field, or whether your argument answers the question set. Those are the things markers weigh most heavily.

03Academic tone: what markers expect

Academic writing is formal without being complicated. The aim is precision: saying exactly what the evidence supports, in language a reader in your field would recognise.

  • Write in full forms rather than contractions: do not, it is, cannot.
  • Replace vague or informal words such as a lot of, things and huge with precise terms.
  • Hedge claims to match the evidence: the data suggest, this may indicate, it appears that.
  • Support opinions with sources rather than phrases like I think or I feel, unless your brief invites reflection.
  • Vary sentence length. A mix of short and longer sentences reads more naturally than a uniform rhythm.
  • Avoid stock phrases such as plays a pivotal role and in today's fast-paced world, which read as generic.

04How to proofread your own work

  1. 1

    Leave a gap

    Put the draft aside for a few hours, or overnight if you can. You will see errors that were invisible while you were writing.

  2. 2

    Run the checker

    Fix the spelling, grammar and punctuation it flags, and consider each tone and clarity note rather than accepting them all automatically.

  3. 3

    Read aloud, slowly

    Reading aloud forces you to hear every word, which catches missing words, clumsy phrasing and sentences that run on.

  4. 4

    Check one thing at a time

    Do separate passes for citations, then headings and numbering, then consistency of terms and spelling. Trying to catch everything at once misses more.

05When a human proofreader is worth it

For short, low-stakes work, a checker and a careful read are usually enough. A human editor makes the biggest difference on work that carries a large share of your grade, such as dissertations, final-year projects and major coursework, and when English is not your first language.

An editor who knows your subject corrects every line, rewrites unclear sentences without changing your meaning, checks your referencing against the required style, and uses tracked changes so you can see and learn from each correction.

Writing guide

Six grammar mistakes markers see most in academic writing

Each is simple to fix once you know to look for it. The checker flags all six.

  1. Mistake 1

    The results was significant.

    The results were significant.

    A plural subject takes a plural verb.

  2. Mistake 2

    We should of tested a larger sample.

    We should have tested a larger sample.

    After could, should or would, the word is “have”.

  3. Mistake 3

    Its clear that the policy failed.

    It is clear that the policy failed.

    “Its” is possessive. Academic writing also avoids “it's”.

  4. Mistake 4

    The effect was greater then expected.

    The effect was greater than expected.

    Comparisons use “than”. “Then” refers to time.

  5. Mistake 5

    Less participants completed the survey.

    Fewer participants completed the survey.

    Use “fewer” for things you can count.

  6. Mistake 6

    Due to the fact that funding fell, the project ended.

    Because funding fell, the project ended.

    Shorter phrasing is clearer and saves words.

UK or US spelling?

UK, Australian and most Canadian universities expect UK spelling. Whichever you use, keep it consistent.

UKUS
organise, analyse, recogniseorganize, analyze, recognize
colour, behaviour, labourcolor, behavior, labor
centre, theatre, fibrecenter, theater, fiber
defence, offencedefense, offense
travelled, modelling, cancelledtraveled, modeling, canceled

FAQs

About the grammar checker

Privacy, accuracy and what it can and cannot check.

Yes. There is no sign-up, no word credits and no trial. The checker runs entirely in your browser, so it costs us nothing to run and costs you nothing to use.

No. The check happens on your own device using JavaScript, and your text is never sent to our servers or anyone else. If you close the page, the text is gone.

It reliably catches common spelling, grammar, punctuation and tone mistakes, and it favours precision, so it flags only what it is confident about. It cannot judge whether your argument is clear, your structure works or your referencing is correct. That is what a human editor is for.

Because no automated check can confirm that an argument answers the question, uses the right sources or meets your rubric. The score tops out at 94, and document-level problems such as missing citations or flat, formulaic sentences take points off even when the grammar is perfect.

It is not an AI detector, and no tool can prove authorship. It does flag the patterns markers and detectors associate with AI-generated writing: stock phrases such as “plays a pivotal role”, uniform sentence lengths, formulaic transitions and claims with no citations. Rewriting those in your own voice improves the work either way.

Yes. Formatting is converted into clean text as you paste, so headings, paragraphs, bullet points, numbered lists and tables keep their structure, and Markdown symbols are removed. The checker needs that structure to judge paragraphs and sentences properly.

Both. Choose UK or US English above the text box and the checker flags spellings from the other variety, so your work stays consistent. Most UK and Australian universities expect UK spelling.

The free checker handles up to 3,000 words at a time, which suits an essay or a single chapter. For a full dissertation or thesis, send us a link to the document and an editor will proofread all of it, with a fixed quote first.

Checking your own spelling and grammar is generally allowed, in the same way as a spellchecker in Word. Some institutions restrict AI tools that rewrite content, so check your module guidance. This checker only points out issues; you decide every change.

Assessed work

Do not leave the final read to software

Send the document and a subject editor will proofread every line, check your referencing and return tracked changes before your deadline.

  • Fixed quote in about 30 minutes
  • No payment until you accept
  • Confidential by default
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