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Grammar Checker
Check your writing for common grammar mistakes, misspellings, and wordy or passive-voice style issues, with plain-English explanations. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
How it works
- Paste or type your text into the box.
- Checks run automatically as you type (briefly debounced so it doesn't lag on long text).
- Each issue found shows the flagged snippet, a plain-English explanation, and which category it falls under.
What it actually checks
Four independent passes over the text, each looking for a different, narrow class of issue — no AI model, no server, nothing sent anywhere:
- Grammar — "could of" → "could have", missing capital letters after a sentence ends, and a/an agreement (with common exceptions like "an hour" and "a university").
- Spelling — a curated list of frequently misspelled words (definately, seperate, recieve, and similar), plus "alot" → "a lot".
- Style — likely passive voice, vague "weasel words" (very, basically, several…), wordy phrases ("due to the fact that" → "because"), repeated words, and sentences that open with "So" or "There is/are".
- Worth checking — every occurrence of commonly confused words (its/it's, your/you're, their/there/they're, affect/effect) is flagged as a reminder, whether or not it's actually wrong, since telling them apart correctly needs to understand the sentence's meaning.
This is rule-based pattern matching, not language understanding — it won't catch every grammar mistake (subject-verb agreement across a complex sentence, wrong verb tense, and similar issues are out of reach for this approach), and it can occasionally flag something that's actually fine. Treat it as a first pass, not a final proofread.
FAQ
Is this as thorough as Grammarly or Microsoft Editor?
No, and it doesn't try to be. Those tools run large language models on a server, which means your text has to leave your device. This one runs a fixed set of rules — common mix-ups, misspellings, and prose-style checks like passive voice — entirely in your browser, so it's more limited but keeps everything local.
Why does it flag words like "its" or "your" even when I used them correctly?
Those are listed under "Worth checking," not "Grammar" — a deliberate, lower-confidence category. Telling "its" from "it's" correctly requires understanding the sentence's meaning, which simple pattern matching can't do reliably, so every occurrence is flagged as a reminder to double-check rather than a claimed error.
Does it check spelling for every word, like a dictionary?
No — it checks against a curated list of commonly misspelled words (definately, seperate, recieve, and similar), not a full dictionary. It won't catch every typo, and it won't flag words it doesn't recognize as simply unusual.
What's a false positive I should expect?
The a/an check assumes standard pronunciation, so unusual cases can trip it up, and the missing-capital check can misfire after abbreviations like "Dr." or "U.S." — both are noted limitations, not bugs to report.
Is my text uploaded or stored anywhere?
No. Every check runs in your browser using JavaScript — nothing you type is sent to a server, saved, or logged.
How we compare
| Feature | Ceyentra Web Tools | Grammarly / Microsoft Editor | Typical free online grammar checkers |
|---|---|---|---|
| Runs entirely in your browser — nothing sent to a server | ✓ | ✗ | ✗ |
| No sign-up | ✓ | Free tier works without one; full features need an account | ✓ |
| Deep, context-aware grammar correction | ✗ | ✓ | Varies — most also use a server-side engine |
| No ads | ✓ | ✓ | Varies — many are ad-supported |
If keeping a draft off a third-party server matters more than deep AI-level correction — internal notes, something not ready to share — this catches the common slips without your text leaving your device. For a genuinely thorough pass, a server-backed tool like Grammarly will catch more.