AltAI · Write
Free AI Grammar Checker
Paste your text, get the corrected version first, then a short explanation of each fix.
- Free
- No account
- Chats stay in your browser
What the Grammar Checker does
The AltAI Grammar Checker is a general AI chat model told to proofread. Paste a sentence, paragraph or short document and it returns the corrected text followed by a short list of what it changed and why, covering grammar, spelling, punctuation and awkward phrasing. It is free, needs no account, and your conversations are stored in your browser rather than on an account.
For a quick spelling pass on a single block of text, the AltFTool Spelling Checker is faster. Use this chat when you want explanations, a choice of tone, or help with a sentence that is grammatically fine but unclear. Like any language model it can miss errors or suggest changes that are not needed, so review each fix rather than accepting all of them.
Corrected text first
You get the clean version at the top so you can copy it straight away.
Change list with reasons
Each fix is listed with a one-line explanation, which helps you learn the rule.
Keeps your voice
It is told to fix errors, not to rewrite your style, unless you ask for that.
British or American
Say which variety you use and it applies the matching spelling and punctuation.
How to use the Grammar Checker
- 1
Choose the Grammar mode in AltAI.
- 2
Paste your text and mention British or American English.
- 3
Copy the corrected version and read the list of changes.
Example prompts
Click one to open AltAI in this mode with the prompt already sent.
- Check my paragraph“Please check this paragraph for grammar and spelling mistakes: [paste your text]”Try this prompt
- Explain the mistakes“Correct this and explain each mistake simply so I can learn from it: [paste your text]”Try this prompt
- British English check“Proofread this in British English spelling and punctuation: [paste your text]”Try this prompt
- Is this sentence right?“Is this sentence grammatically correct? If not, why? [paste your sentence]”Try this prompt
- Fix my cover letter“Proofread my cover letter without changing my tone. Ask me to paste it.”Try this prompt
- Comma help“I always get commas wrong. Can you check the commas in this text and explain the rules you apply? [paste your text]”Try this prompt
Tips for better answers
- Paste one section at a time for long documents.
- Say who the text is for, such as a teacher, client or hiring manager.
- Ask it to leave technical terms and names unchanged.
- Ask for "errors only, no style changes" if you want minimal edits.
Questions
Is the AltAI Grammar Checker free?
Yes. It is a mode within AltAI, which is free to use and does not require an account. Paste your text, read the corrections and copy the result. Your chat history stays in your browser, so nothing is tied to a login and clearing your browser data removes it.
Does it catch every mistake?
No checker catches everything, and an AI model can also flag correct sentences or miss subtle errors such as the wrong word spelled correctly. Read the change list and decide on each fix yourself. For important documents, a final read by a person who knows the subject is still worth it.
How is this different from the AltFTool Spelling Checker?
The Spelling Checker is a dedicated tool for quickly finding and fixing spelling mistakes in a block of text. The AltAI Grammar Checker is a chat, so it also handles grammar, punctuation and clarity, explains each change and answers follow-up questions about the rules. Use the tool for speed and the chat for explanations.
Will it change my writing style?
It is instructed to fix errors while keeping your meaning, tone and formatting. If you want it to also improve flow or word choice, ask for that explicitly. If it changes something you meant to keep, tell it, and it will restore your original wording in the next version.
Can it check text in other languages?
It can proofread many widely used languages, though it is most reliable in English. Tell it which language and regional variety the text is in. For languages with fewer online resources the suggestions may be less accurate, so treat them as hints rather than final answers.
Ready when you are
Open AltAI in Grammar Checker mode. Free, no account, and AltAI can be wrong, so check anything that matters.