AI Grammar & Spell Checker — Free Online
Paste your text, click Check, and get grammar, spelling, and punctuation fixed instantly — while your meaning and tone stay exactly the same. 100% private.
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Runs locally in your browser — your text never leaves your device.
How to use the AI grammar & spell checker
Paste or type the text you want to check into the box above. Click Check and the AI will review it for grammar mistakes, misspelled words, punctuation errors, and awkward phrasing. The corrected version appears in a result panel, ready to copy.
Checking runs using Chrome's built-in on-device AI, so your text is processed locally and never uploaded to a server. If your browser does not support built-in AI yet, you can configure an optional Cloudflare Worker endpoint in the AI Settings panel as a fallback.
When available, a detailed list of changes is shown below the corrected text — each one tagged as grammar, spelling, punctuation, or clarity, with the original wording and the fix side by side, so you understand exactly what was corrected and why.
Features
- Fixes grammar, spelling, and punctuation errors in one pass
- Preserves your original meaning and tone — no rewriting your voice
- Detailed change list with type badges: grammar, spelling, punctuation, clarity
- Before → after comparison for every individual change
- Live word count on your input as you type
- On-device AI processing via Chrome's built-in AI — no server upload required
- Optional Cloudflare Worker AI fallback for unsupported browsers
- Copy corrected text to clipboard with one click
- 100% private — your text is never stored or shared
- No account, no signup, and completely free
What it checks: grammar vs. spelling vs. clarity
- Grammar: subject-verb agreement, verb tense, sentence structure, and word order issues
- Spelling: misspelled words and typos, including commonly confused words
- Punctuation: missing or misplaced commas, periods, apostrophes, and other marks
- Clarity: phrasing that is technically correct but awkward, wordy, or hard to follow
This is a correction tool, not a writing-style analyzer — it focuses on fixing errors rather than scoring or coaching your writing.
Frequently asked questions
Is this AI grammar checker free to use?
Yes. The AI Grammar & Spell Checker is completely free with no signup, no account, and no usage limits.
Does my text get uploaded to a server?
No, by default. When Chrome's built-in AI is available, checking runs entirely on your device and your text never leaves your browser. If you configure an optional Cloudflare Worker fallback, text is sent only to that endpoint you control.
What does this tool check for?
It checks and fixes grammar mistakes, spelling errors, punctuation issues, and awkward phrasing that affects clarity — while keeping your original meaning and tone intact.
Will it change my writing style or tone?
No. The AI is instructed to preserve your meaning and tone. It only corrects errors — it does not rewrite your voice or add new ideas.
Can I see exactly what was changed?
Yes. When available, the tool lists each individual change with a type badge (grammar, spelling, punctuation, or clarity) and shows the before and after text side by side.
What is the difference between grammar, spelling, and clarity checks?
Grammar covers sentence structure and verb agreement. Spelling covers misspelled words. Punctuation covers commas, periods, and other marks. Clarity covers awkward phrasing that is technically correct but hard to read.
What browsers support this AI grammar checker?
Chrome 128+ with built-in AI enabled works out of the box. Other browsers can use the tool by configuring a Cloudflare Worker AI endpoint in the AI Settings panel.