✏️ Grammar & Spell Checker

How This Grammar and Spelling Checker Works

Paste a sentence, a paragraph, or a full page of English text into the box above and click "Check Grammar." The tool sends your text to LanguageTool, a grammar checking service used by millions of writers, and its engine scans your text against thousands of rules covering spelling, punctuation, word choice, and sentence structure. Whatever it finds comes back within a second or two and shows up two ways at once: as colored highlights directly inside your text, and as a list of issue cards in the panel on the right, each one explaining exactly what is wrong and how to fix it.

Every issue card includes the surrounding sentence with the problem underlined, a plain-language explanation of the mistake, and, where a fix is confident enough, one or more suggested replacements as clickable buttons. Click a suggestion and it drops straight into your text, the highlight disappears, and the remaining issue count updates immediately. When several replacements look reasonable, LanguageTool lists its best guess first.

Step by step

1. Paste or type your text. The editor accepts anything from a single sentence to several thousand words. There is no minimum, and the tool behaves exactly the same whether you are checking a text message or a full report.
2. Click "Check Grammar." Your text is sent to the checking service for analysis. A short "Analyzing..." state appears on the button while the request is in progress, usually for no more than a couple of seconds.
3. Review the highlighted issues. Each flagged phrase is underlined in the editor and listed as a card on the right with an explanation. Click directly on a highlight or scroll through the cards to see them all.
4. Apply fixes one at a time, or all at once. Click any suggested replacement to apply it immediately, or use "Fix All" to apply the top suggestion for every fixable issue in a single click. If you change your mind, "Undo" reverses the last change.

The stats bar above the editor tracks your issue count, character count, and word count as you type, so you can see at a glance how a check went and how long the current draft is. A single request checks up to 20,000 characters, roughly 3,500 to 4,000 words of English prose, which comfortably covers anything from a tweet to a long blog post in one pass.

Common English Mistakes This Checker Catches

Some errors are the kind every English writer runs into eventually, no matter how careful they are, because English is full of words and structures that look almost identical but mean, or require, something different. Here are the categories that come up constantly.

Homophones and commonly confused words

"Their," "there," and "they're" sound identical but do three different jobs: possession, location, and a contraction of "they are." The same goes for "your" and "you're," "its" and "it's," and "affect" and "effect." These mistakes rarely trip up a plain spell checker, since every one of these words is spelled correctly on its own, which is exactly why a grammar-aware tool that reads the sentence around the word matters.

Subject-verb agreement

A singular subject needs a singular verb, and a plural subject needs a plural verb, but the rule gets harder to apply once a sentence has a few words separating the two, or a phrase like "along with" or "as well as" sitting in between them. "The list of items were long" should read "The list of items was long," because "list," not "items," is the actual subject.

Comma splices and run-on sentences

Joining two complete sentences with only a comma, as in "I finished the report, I sent it to the team," creates a comma splice. The usual fix is a period, a semicolon, or a coordinating conjunction like "and" after the comma. Run-on sentences go a step further and drop the punctuation entirely, which the checker flags just as reliably.

Apostrophes in possessives and plurals

"The dog's bone" needs an apostrophe because the bone belongs to the dog. "The dogs ran" does not, because "dogs" is simply plural. Mixing these up, or writing "its" when you mean "it's," is one of the single most common issues the checker reports.

Spelling mistakes round out the list and are usually the simplest to fix: transposed letters, missing letters, and words that are spelled correctly somewhere but wrong for this context, like "definately" for "definitely" or "recieve" for "receive," all get flagged with the correct spelling offered as the first suggestion.

What an Automated Checker Catches, and What It Cannot

A rule-based, pattern-matching system like LanguageTool is genuinely good at the mechanical layer of writing: spelling, punctuation, agreement, and the well-documented confusions above. It is less reliable, and sometimes flatly wrong, about anything that depends on meaning, intent, or context the software cannot see.

Here is roughly where the line falls.

• It catches: misspellings, doubled words ("the the"), missing or extra commas, run-on sentences, subject-verb and pronoun-antecedent disagreement, many commonly confused word pairs, inconsistent verb tense within a sentence, and a range of style flags like unnecessarily wordy phrasing.
• It usually misses: factual errors ("Paris is the capital of Italy" is grammatically flawless), a joke that reads as rude out of context, a tone that does not match the audience, an argument that does not logically hold together, and any nuance in why one correct word choice fits better than another equally correct one.
• It sometimes gets wrong: proper nouns, brand names, code snippets, and deliberately unconventional phrasing pasted alongside regular prose. A name like "McKinsey" or a technical term like "middleware" can get flagged as a misspelling simply because it is not in the checker's dictionary.

None of this makes the tool less useful. It just means the suggestions are a starting point rather than a verdict. Read every flagged issue before accepting it, especially anything involving a name, a quotation, or a piece of code, and skip suggestions that would change something you wrote on purpose. The goal is writing that is correct and still sounds like you, not writing that blindly follows every automated suggestion.

Privacy: What Happens to Your Text

Unlike most tools on this site, this checker is not purely local. Checking grammar and spelling well requires a large set of language rules too heavy to ship to every visitor's browser, so when you click "Check Grammar," your text is sent over an encrypted connection to LanguageTool's public checking API, analyzed there, and the results are sent straight back. TextSorter's own server sits in between only as a thin proxy: it forwards your text, adds a "Cache-Control: no-store" header to the response, and does not log, save, or inspect anything you type.

That is a meaningfully different privacy model from a tool that runs entirely inside your browser, and it is worth being upfront about the difference. Your text does leave your device for the length of one request. It is not stored in a database anywhere in this pipeline, and it is discarded immediately after the check completes, but it does briefly pass through a third-party service you have not necessarily vetted yourself. For an email draft, an essay, or a blog post, that is a reasonable tradeoff for a genuinely useful grammar engine. For anything truly sensitive, a password, a medical record, a legal document under a strict confidentiality agreement, treat this the same way you would treat any other online API and keep it out of the box.

Checks are also capped at 20,000 characters per request, which keeps each request fast and prevents any single check from ballooning into something that takes minutes instead of seconds.

This Checker vs. Word's and Google Docs' Built-In Checking

Microsoft Word and Google Docs both ship with grammar and spelling checkers that run as you type, underline problems in real time, and never require leaving the document. That immediacy is a real advantage, and if you draft everything inside one of those apps, their built-in checker is one less step than copying text elsewhere.

This tool earns its place for everything that does not live inside Word or Docs to begin with: an email you are drafting directly in Gmail or Outlook, a comment on a support ticket, a caption for social media, a paragraph pasted from a PDF, a message in Slack, or a product description typed straight into a CMS field. Rather than opening a document just to borrow its spell checker, you paste the text here, get the same category of feedback, and paste the corrected version back where it belongs.

The two also differ in how they present results. Word and Docs mark issues inline with underlines you click one at a time, which works well inside a long document you are actively editing. This tool instead builds a single list of every issue found in one pass, each with its own card and explanation, which makes it easier to scan a short piece of text for every problem at once, or fix everything in bulk with "Fix All" rather than clicking through a document line by line.

Neither approach is objectively better. They suit different moments: one for the document you are already writing in, the other for everything you write somewhere else.

Who Uses This Grammar Checker

Students

Essays, discussion posts, and application materials all benefit from a second pass that catches the small mistakes that slip by after reading your own paragraph for the tenth time. Running a draft through before submitting catches typos and agreement errors that are easy to miss when you already know what you meant to say.

Professionals

Client emails, status reports, cover letters, and LinkedIn posts all carry more weight when they are clean. A single "your" instead of "you're" in a job application or a client-facing email can undercut an otherwise strong message, and catching it before sending takes seconds.

Non-native and native English speakers alike

Non-native speakers often use a tool like this to catch article and preposition mistakes that are notoriously hard to internalize as rules. Native speakers use it just as often, mostly to catch the fast-typing errors that come from writing quicker than you are checking: missing words, doubled words, and autocorrect gone wrong.

Writers, editors, and support teams

Bloggers and freelance writers use it as a fast first pass before a closer human edit. Customer support teams run canned responses and macros through it before saving them as templates, since a mistake in a template gets repeated on every ticket that uses it until someone notices.

Tips for Getting the Most Out of an Automated Check

• Check finished drafts, not first drafts. Running a check on every sentence as you write interrupts your flow and buries you in suggestions for a paragraph you are about to rewrite anyway. Save it for once you have a complete draft.
• Read the explanation, not just the suggestion. The one-line explanation on each issue card tells you why something was flagged, which matters when you disagree with the suggested fix or when the same mistake keeps showing up across your writing.
• Use "Fix All" for short text, and go card by card for anything long or important. Fix All is fast and works well for quick messages, but for anything that matters, like a cover letter, look at each suggestion individually so you do not accidentally accept a fix for a name or a deliberate stylistic choice.
• Re-check after a big edit. A large rewrite can introduce new mistakes even while it fixes old ones. Running the check again after major changes catches anything the edit itself created.
• Treat proper nouns and jargon with suspicion. If a flagged "misspelling" is actually a brand name, a person's name, or a technical term, the checker simply does not recognize it. Leave it as written.

Used this way, an automated checker is closer to a fast, tireless proofreader than a replacement for your own judgment: it catches what your eyes have stopped seeing, and you decide what actually gets changed.

Frequently Asked Questions

Related content tools

🔒 Privacy: Nothing Is Stored

Your text is sent to LanguageTool's checking API over an encrypted connection to generate the suggestions above, and TextSorter's server never logs, saves, or reads it: the response comes back with a "no-store" header and nothing lingers afterward. It does briefly leave your device to reach that service, so keep passwords, medical records, and anything under a strict confidentiality agreement out of the box.