A free tool from Zentor

Free AI email reply generator

Paste the email sitting in your inbox, tell us what you want to say, and get a reply you can send. Free.

Example reply
From
you
To
Sam
Subject
Re: are you still good for our…

Hi Sam, Still on for the call — but could we move it to Thursday at 2pm instead? Something came up on my end tomorrow. Same agenda works for me: proposal draft and next quarter's timeline. I'll read through the draft tonight so we can use the time well. If Thursday doesn't work, I'm also free Friday morning. Just let me know. Best, [your name]

Zentor drafts replies and follow-ups inside your Gmail, in your voice — you approve before anything sends.
  1. Paste the email
  2. Say what you want
  3. Copy the reply

See it in action

A scheduling reply

Sam wants to confirm tomorrow's call and go over the proposal. You want the call — just not tomorrow.

Sam wrote

Hi, are you still good for our call tomorrow at 2pm? I want to go over the proposal draft and the timeline for next quarter. Let me know! — Sam

You asked: Say yes, but move it to Thursday, same time.

To
Sam
Subject
Re: are you still good for our…

Hi Sam, Still on for the call — but could we move it to Thursday at 2pm instead? Something came up on my end tomorrow. Same agenda works for me: proposal draft and next quarter's timeline. I'll read through the draft tonight so we can use the time well. If Thursday doesn't work, I'm also free Friday morning. Just let me know. Best, [your name]

A polite decline

A community meetup invited you to speak next month — 30 minutes, travel covered. The timing is wrong, but you don't want to close the door.

Meetup organizers wrote

Hello, we'd love to have you speak at our community meetup next month. It's a 30-minute slot on the 14th, and we can cover travel. Would you be interested?

You asked: Thank them, decline, stay open to a future date.

To
Meetup organizers
Subject
Re: we'd love to have you speak…

Hello, Thank you for the invitation — I'm glad you thought of me. Unfortunately the week of the 14th is already full, so I have to pass this time. If you're planning another meetup later in the year, I'd genuinely be interested, so please keep me on the list. Thanks again, and good luck with the event. Best regards, [your name]

Answering a support question

Dana upgraded last week but her invoice still shows the old plan — and she's asking whether export is included.

Dana wrote

Hi team, I upgraded last week but my invoice still shows the old plan. Can you check? Also, does the new plan include the export feature? Thanks, Dana

You asked: Confirm the invoice is being corrected; yes, export is included.

To
Dana
Subject
Re: I upgraded last week but my…

Hi Dana, Thanks for flagging this — you're right, and I've asked our billing team to issue a corrected invoice. You should see it within [timeframe]. And yes, export is included in your new plan. You'll find it under Settings → Export. Anything else, just reply here. Best, [your name]

One reply is easy. All of them is the job.

Zentor reads your Gmail, drafts replies in your voice for the threads that need them, and waits for your approval before anything sends. This tool handles one email; Zentor handles the inbox.

See the AI email assistant

What an email reply generator actually does

An email reply generator reads the message you received and writes the answer. Not a generic "thanks for your email" — a reply that picks up each question or request in the original and addresses it, in the tone you asked for.

The reason it works better than starting from a blank compose box isn't the writing. Most replies fail in the reading: you answer the first question and miss the third, or you spend ten minutes on phrasing for a reply that needed thirty seconds. Paste the whole email in and the generator can't skip a point — it's all in front of it.

This email reply generator is free to use. If you want it to answer every email instead of the ones you paste in, that's what Zentor's AI email assistant is for.

You will also see this kind of tool called an email response generator, an AI email responder or an AI email reply tool. The job is the same: you bring the email, it drafts the answer, and you decide whether it goes out.

When to use an AI email reply generator

Three situations cover most uses:

  • The email you keep putting off. Usually it's not hard — it just asks for a yes, a no, or a small decision you haven't made. Writing the reply forces the decision, which is why it sits. Generating a draft gets you to the decision faster.
  • The thread with three questions in it. Customer emails and project threads love stacking asks. A reply generator that sees the whole email answers all of them, not just the one you remembered.
  • The reply that has to land right. Declining an invitation, pushing back on a price, telling a client the date slipped. These take forever to draft because tone is the hard part. Generating a version in "formal" or "friendly" gives you something to react to instead of a blank page.

Where it doesn't help: replies that need information only you have (contract terms, internal decisions) and emails where the right move is a phone call.

How to get a reply you can actually send

The output is only as specific as what you give it. Three habits that make the difference:

Paste the real email, not a summary. The generator reads structure — a bulleted list of requests, a buried deadline — that a one-line summary loses.

Use the goal field for the awkward part. "Decline but stay warm" or "say yes but push the date" is exactly what the field is for. Left blank, you get a competent generic acknowledgement.

Fill in the brackets before you send. When a detail is missing — a name, a date, a price — the reply uses a placeholder like [date] rather than inventing one. That's deliberate: a wrong fact is worse than a bracket. Do a 10-second pass for placeholders before hitting send.

One more thing worth saying: read the reply once before pasting it into Gmail. The draft is a starting point you own, not an autopilot.

Reply generator vs. writing it in ChatGPT

You can paste an email into any chatbot and get a reply. The difference here is structure. This page is built for one job: a labeled box for the email you got, a field for what you want to say, a tone picker, and a reply-shaped output — no prompt to write, no chat history to manage.

The other difference is what happens next. In a chatbot the reply is the end of the session. Here, "Continue in Zentor" carries your email and draft into Zentor, where it can actually be sent — and where the next reply writes itself from the thread instead of a paste.

Questions

Is the email reply generator free?

Yes, the generator is free. Generate opens Zentor, where you sign in or start a free trial and the drafted reply is written for you.

Do I need to sign up?

Yes — Generate hands off to Zentor, where you sign in or start a free trial; the draft built from your inputs is waiting there.

How is this different from pasting the email into ChatGPT?

The job is pre-shaped: the original email, your goal, and the tone are separate inputs, and the output is a ready-to-send reply rather than a chat message you have to trim. The handoff is different too — the draft can continue into Zentor to be sent, instead of staying in a chat window.

Is it private? What happens to the email I paste?

Don't paste anything you wouldn't share with a web service — no passwords, financial details, health information or confidential documents. The tool is built for ordinary business email. The privacy policy explains how Zentor handles data.

Can I control the tone and length?

Yes — professional, friendly, formal or concise via the tone picker, and the goal field steers content. For length, say so in the goal ("keep it to three sentences").

What if the reply invents a detail?

It shouldn't — the tool uses placeholders like [date] or [name] instead of guessing. If you do see an invented fact, treat it as a bug to fix before sending, and shorten or clarify the input.

Does it work for replies in languages other than English?

The tool is designed for English email. It may produce reasonable output in other major languages, but the examples, prompts and tone options are all tuned for English.

Can it reply to a whole thread, not just one email?

Paste the latest message (or the parts you're answering). Very long threads can exceed the input limit — paste the most recent email and any earlier message that has context the reply needs.

Will an AI email response sound like me?

It will sound like the tone you picked, not like you personally. For replies in your actual voice — trained on how you write — that's what Zentor does inside Gmail.

Let Zentor write the next one for you.

Continue in Zentor

See how it works in Gmail