Proofread your email before you send it.
A wrong preposition or a missing article won't stop your email from working — but it can make it look rushed. Paste the email you're about to send. ESL Humanizer fixes the grammar and phrasing that sound unnatural, keeps your tone, and shows you exactly what changed.
- Free for ~250 words
- No sign-up needed
- Every correction visible
Proofread the email you're about to send
Keep my tone only fixes the English. Pick another tone if you also want to adjust how it sounds.
Don't paste passwords, card numbers or confidential client data. Your text is sent to our AI provider to be checked and isn't saved to our database.
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Writing tips
6 mistakes proofreading catches in work emails
Small errors that non-native writers make most often in emails — easy to miss when you're in a hurry.
- 01
Look forward to + -ing
In look forward to, to is a preposition, so the next verb takes -ing.
I look forward to hear from you.
I look forward to hearing from you.
- 02
Information has no plural
Information, advice, feedback and equipment are uncountable — no -s, and no "an".
Please send me the informations.
Please send me the information.
- 03
An invoice for, not of
Documents are for a period, an order or a client: an invoice for March, a quote for the project.
Please find attached the invoice of March.
Please find attached the invoice for March.
- 04
Confirm receipt
The noun is receipt. "The receiving" is a direct translation that sounds unnatural.
Can you confirm the receiving?
Could you confirm receipt?
- 05
Would be grateful if you could
Polite requests in English step back in time: will → would, can → could.
I will be glad if you can check it.
I would be grateful if you could check it.
- 06
Don't join two sentences with a comma
Two complete sentences need a full stop (or a word like and or so) between them.
The call is at 3 p.m., please join on time.
The call is at 3 p.m. Please join on time.
- Keep my tone fixes the English and leaves the style alone.
- Keeps names, dates, numbers and links exactly as written.
- Never adds content, apologies or commitments.
- Highlights every correction so you can learn the patterns you repeat.
For long email threads, paste only the part you wrote — not the whole conversation.
FAQ
Questions about proofreading emails
Is it just a grammar checker?
It goes a step further: besides grammar and spelling, it fixes phrasing that is grammatically fine but doesn't sound natural in English — the kind of thing grammar checkers usually miss.
Will it change my tone?
Not with Keep my tone selected — it only fixes the English. Choose Polite, Direct, Formal or Friendly if you also want to adjust how the email sounds.
Can I proofread a reply in a long thread?
Yes. Paste only your reply, not the previous messages — it's faster, and you don't share other people's emails.
Is my email private?
Your text is sent to our AI provider to be checked and isn't saved to our database. Even so, don't paste passwords, card numbers or confidential client data.
How long can my email be?
Free checks take up to 1500 characters at a time — about 250 words. Subscribers can check up to 3,000 characters (~500 words) at once.