How to Write Customer Messages on WhatsApp

How to write to a customer is a question that nags at almost anyone running WhatsApp for their business. On the phone, your tone of voice, your smile and even your pauses do half the work. In writing, all you have is words. The same sentence can land as warm for one person and cold for another.

The good news: this isn't a talent thing, it's a habit thing. Once you settle on a few simple rules, your messages start looking both friendlier and more professional. In this guide we'll go through tone, emoji, when voice notes belong, capital letters and reply times, one at a time. Every section comes with good and bad examples.

Why Does the Tone of a Message Matter So Much?

When a customer writes to you, they may not know you at all. They haven't seen your shop or your face. Your first message forms their first impression. However you'd greet someone walking through the door, that's how you should greet them in writing.

There's another thing: in written communication, people fill the gaps with their own mood. When you reply "No." in one word, the customer can read it as "this person can't be bothered." In reality you were just short because your hands were full.

Put simply, the tone of your message sells as much as your product does. Or it doesn't.

Friendly or Formal? Finding the Middle

Small businesses are usually warm places. Don't lose that. But the line between warm and too familiar is a thin one.

The basic formula: talk like a person, but a person who knows their trade.

Being too formal pushes customers away:

❌ Bad: "Dear valued customer, your enquiry has been received and will be reviewed by the relevant department in due course. Regards."

That sentence reads like it was copied out of a corporate email. It kills the one advantage a small business has over the big chains: human contact.

Being too casual costs you trust:

❌ Bad: "yeah mate course come down 😎🔥 we'll sort you out don't worry"

If the customer doesn't know you, that tone can make them uncomfortable. And vague promises like "we'll sort you out" create arguments later.

The right answer sits in the middle:

✅ Good: "Hi, thanks for getting in touch. We have 2pm and 4:30pm open on Saturday. Which one suits you better?"

Warm but clear. Personal but serious. The customer feels there's a human on the other end, and they know exactly what to do next.

First Names or Mr/Ms?

The rule is simple: mirror how the customer addresses you, then stay one notch more polite. If they sign off with just their first name, using their first name back is fine. If they open with "Good afternoon," don't answer with "hey." Nobody is offended by slightly too polite. The other direction stings.

The exception is regulars — people you've known for years and joke with in person. With them, follow the natural flow.

Emoji: How Much Is Too Much?

Emoji are like salt. Too little and the food is bland; too much and it's inedible.

A practical measure: one or two emoji per message. Per message, not per sentence.

❌ Bad: "Hiii 👋😊 your appointment 🗓️ is tomorrow at 3pm ✅ see you 🙏💐✨"

That message doesn't look serious. It's also tiring to read.

✅ Good: "Hi, your appointment is tomorrow at 3pm. See you then 🙂"

One emoji, at the end of the sentence, doing the job of a smile. That's enough.

Where Emoji Never Belong

Price and payment conversations. A smiley next to a number undercuts the number.
Complaints and apologies. An angry customer doesn't want to see a grinning face.
Cancellations, delays, bad news. Here an emoji reads as "I'm not taking this seriously."

❌ Bad: "Sorry, we've run out of that one 😅"

✅ Good: "Sorry about that — we're out of stock right now. The next batch lands next week. Shall I let you know as soon as it's in?"

The second message apologises, gives a reason and offers a way forward. No emoji required.

Which Emoji Are Safe?

The simple, universal ones: 🙂 👍 🙏. Stay away from anything whose meaning shifts between cultures or that can be read as flirty (😘 😍 🔥) in customer conversations.

The Capital Letters Problem

This is one of the most common mistakes, and one of the most expensive.

❌ Bad: "WE'RE EXPECTING YOU AT 3PM"

All caps in writing means SHOUTING. Even if you only did it so the message would stand out, the customer feels told off.

✅ Good: "We're expecting you at 3pm."

If you want emphasis, use WhatsApp's bold formatting instead — a word wrapped in asterisks shows up bold. And even that, use once per message.

There's an opposite mistake too: never using capitals at all.

❌ Bad: "ok cya tmrw"

That message may have been typed in a hurry, but what the customer reads is "this business is careless." Starting a sentence with a capital and finishing it with a full stop costs you two seconds and moves your business up a notch in their eyes.

Abbreviations and Typos

"Thx", "pls", "u", "cya" belong in a chat with mates. When you write to a customer, write the words out.

❌ Bad: "hi yh we got it in stock"

✅ Good: "Hi, yes — we have it in stock."

You don't need to go overboard on spelling; nobody expects literature from you. But once you've typed critical details — price, date, time, address — read them back once. A single wrong character there means a customer who never shows up.

Voice Notes: When Yes, When No?

Voice notes are a huge convenience when you're working. Hands full, one button, done. On the customer's side, though, the story is different.

They're often in a meeting, on the bus, next to a sleeping child, or somewhere quiet. They can't play it. And even if they can, they can't find the price or the address inside it without scrubbing back and forth.

When not to send a voice note:

First contact. Sending a voice note to someone who's never met you comes across as pushy.
Prices, addresses, times, account details. These should be in writing so the customer can scroll back to them.
Long explanations. The odds of anyone listening to a multi-minute voice note all the way through are low.

When a voice note actually helps:

The customer sent you one first (speak the same language).
Something complicated needs explaining and typing it would genuinely take ages.
Long-standing customers you're on easy terms with.

If you do send one, the rule is: keep it under 30 seconds and put the critical details underneath in text.

✅ Good use: [20-second voice note] + underneath: "Quick summary: Saturday 2pm works, price as discussed. Address: 12 Market Street."

Reply Time: Silence Is the Worst Answer

When a customer messages on WhatsApp, they expect a fast reply. That's part of why they chose to type instead of call. If you want to dig into that, have a look at Why Customers Don't Want to Call You.

Say you run a salon and you get 30 messages a day. Most of them are simple: "are you free tomorrow," "how much is it." You're mid-appointment and can't look at your phone. Three hours later, the customer has already gone somewhere else.

A practical target: 15 minutes during working hours. If that's not possible, at least send an acknowledgement.

✅ Good: "Hi, got your message. I'm with a customer right now — I'll come back to you properly within about half an hour."

That one sentence makes people willing to wait. Silence gets read as "this person isn't interested."

What About Outside Working Hours?

Replying in the morning to a message that arrived at 11pm is perfectly normal. But the customer doesn't know that. So at minimum, setting an automatic greeting makes a real difference:

✅ Good: "Hi, we've got your message. Our hours are 9am–7pm. We'll get back to you first thing tomorrow."

We walk through how to set that up step by step in How to Set Up WhatsApp Auto-Replies.

11 Concrete Examples of How to Write to a Customer

1. First Greeting

❌ "Yes?"

✅ "Hi, thanks for getting in touch. How can I help?"

2. Price Question

❌ "It's on the website"

✅ "Hi! That service is [your price] and takes about 45 minutes. Would you like me to book you in?"

(Fill in your own number, obviously — the point is the context and the question at the end.)

3. Availability

❌ "No we're full"

✅ "Saturday is fully booked, I'm afraid. We have 11am and 3pm free on Sunday — would either work for you?"

4. When the Customer Is Late

❌ "WHERE ARE YOU YOUR SLOT HAS PASSED"

✅ "Hi, we're holding your 2pm slot. Has something come up?"

5. Cancellations

❌ "No cancellations no refunds"

✅ "We can cancel your appointment. We just ask for at least 24 hours' notice, so we can open the slot up to someone else."

Writing that rule down in advance makes your life much easier. There are sample texts in How to Write an Appointment Cancellation Policy.

6. When a Complaint Arrives

❌ "We did everything we could"

✅ "I'm genuinely sorry that happened. Can you tell me what went wrong? I'll do whatever I can to put it right."

7. Out of Stock

❌ "Sold out"

✅ "That one's sold out at the moment. A new batch arrives Thursday — shall I message you the minute it lands?"

8. Address Request

❌ "Just google us"

✅ "We're at 12 Market Street, town centre. I'll drop a pin too, so you can open it straight in your maps app."

9. Haggling

❌ "No discounts"

✅ "Our prices are fixed, but the 3-session package works out better value than booking individually. Want me to send the details?"

10. After the Job Is Done

❌ [Writing nothing at all]

✅ "Thanks for choosing us today. If anything comes up, just message here."

11. Appointment Reminder

❌ "cya 3 tmrw"

✅ "Hi, just a reminder about your 3pm appointment tomorrow. See you then."

For more ready-made wording, take a look at Appointment Reminder Message Examples.

Message Length and Structure

Nobody reads long paragraphs on WhatsApp. A five-line block on a phone screen makes the eye slide right off it.

Rule: one topic per message. Break long information into short lines.

❌ Bad: "hi so the package is 3 sessions each one takes about 45 minutes you can book any day you like we're open saturdays closed sundays you can pay cash or card and we take half up front on the first session"

✅ Good: "Hi! Here's how the package works:

• 3 sessions, booked as one bundle • Each session takes about 45 minutes • Any day including Saturday (we're closed Sundays) • Cash or card

If you'd like to start, shall we pick a day that suits you?"

Same information, now readable. And there's a question at the end — the customer knows what happens next.

End Every Message With a Next Step

This is the one most people miss. You give the information, the message ends, the ball sits with the customer, they keep thinking about it, and the conversation quietly dies.

Put a small nudge at the end of every message:

"Shall I book you in?"
"Which day works for you?"
"Want me to send a photo?"
"Shall I send the address?"

That's not pressure, it's convenience. You're showing them the next step.

How Am I Supposed to Remember All These Rules?

You don't have to. There are two practical approaches:

1. Build a list of ready-made replies. Write down the 10 questions you get most often and draft your ideal answer underneath each one. Save it in your phone's notes and copy-paste. The first week is awkward; by the second week you know them by heart.

2. Hand it to an AI assistant. An AI assistant that connects to your existing WhatsApp line can answer customers around the clock, using the tone and the information you set. It takes appointments, answers the usual questions, and there's no silence while you're busy with someone. When you need to, you can open the conversation in the panel and take over yourself.

If you're leaning towards the second option, the assistant can only answer well if your business information is properly prepared. How to Build a Business Knowledge Base is a good starting point.

A Note on Data Protection

When you message customers on WhatsApp you're collecting names, phone numbers, sometimes health details or addresses. That counts as personal data, and it falls under data protection law — GDPR in the UK and EU, and equivalent rules elsewhere. Sending unsolicited bulk messages in particular carries real risk.

For general background, see GDPR and WhatsApp: What Businesses Need to Watch. For anything specific to your own business, get definitive advice from a qualified legal professional. Your local trade association can often point you to one.

Frequently Asked Questions

How should I write to a customer — what's the right tone?

Warm but clear. Treat the person the way you'd treat a customer who has just walked into your shop: say hello, answer their actual question, and suggest a next step at the end. Both stiff corporate language and overly matey language push people away.

Does using emoji make me look unprofessional?

Used in the right dose, no — it softens the message. Stay under one or two emoji per message and stick to the simple ones (🙂 👍 🙏). Don't use emoji in messages about prices, complaints, apologies or bad news.

Is it OK to send customers voice notes?

It depends. For first contact, for critical details like prices, addresses and times, and for long explanations, write it out — so the customer can scroll back to it later. If they sent you a voice note first, or if something genuinely takes too long to type, keep it under 30 seconds and put a written summary underneath.

How quickly should I reply to a customer message?

Fifteen minutes during working hours is a good target. Even if you can't answer properly straight away, send a short acknowledgement like "Got your message, I'll come back to you within half an hour." What loses customers isn't a slow reply — it's no reply at all. Set an automatic greeting for outside your hours.

Every message you send on WhatsApp is your shop window. Apply the rules in this guide for a few weeks and you'll start doing it without thinking.

If you're too busy to keep up with your messages, WpAsis connects to your business's existing WhatsApp line and replies around the clock in the tone you set. Setup is a QR scan — no coding involved. For details and current pricing, take a look at wpasis.com.