You paid to put 500 people on your registration page. By the time you go live, 300 of those seats are empty. Those 300 did not change their minds about your offer. They forgot the webinar was happening, because the one reminder email you sent is still sitting unopened in a promotions tab nobody checks.
That gap between who signs up and who shows up is the most expensive number in your funnel, and email by itself will not close it. A WhatsApp reminder gets read in minutes. Your reminder email gets read in hours, if it gets read at all. This guide covers how to run WhatsApp reminders for a webinar the right way: the one rule most people break, how to set it up, and the reminder sequence that pulls no-shows back into the room.
Want to see behavior-timed reminders run across WhatsApp, email, and SMS from one setup? Experience It Live!
Can you use WhatsApp for webinars?
Yes. WhatsApp is one of the strongest reminder channels you can add to a webinar funnel, and most hosts are not using it yet.
The reason is simple math on attention. WhatsApp has more than 2 billion monthly active users, according to Statista, and message open rates on the platform are commonly cited near 98%, far above the 20% to 30% a healthy email list sees. When your reminder has to compete with a crowded inbox, the channel that gets opened wins. A registrant who ignores three reminder emails will still glance at a WhatsApp message that says “we go live in 20 minutes, here is your link.”
WhatsApp does not host your webinar. Your webinar still runs on Zoom, or GoToWebinar, or whatever you use now. WhatsApp is a reminder and follow-up channel that sits around the event and pulls people back to it. Used well, it does one job better than almost anything else: it gets the people who already raised their hand to actually turn up.
What is the WhatsApp 24-hour rule, and why does it decide your reminder strategy?
WhatsApp only lets a business send free-form messages to someone within 24 hours of that person’s last message to the business. Outside that 24-hour window, you can only send pre-approved template messages. This one rule shapes every webinar reminder you will ever send on WhatsApp, so it is worth understanding before you write a single message.
How the 24-hour window works
WhatsApp’s Business Platform splits your messages into two types. When a contact messages you first, a 24-hour “customer service window” opens, and inside it you can reply with anything: plain text, questions, links, whatever the conversation needs. The moment 24 hours pass with no new message from them, that window closes.
Session messages versus template messages
Inside the 24-hour window you send session messages, which are free-form and cost nothing extra to phrase however you like. Outside the window you send template messages, which are message formats you submit to WhatsApp for approval in advance. Reminders, confirmations, and “you are live” nudges almost always go out on your schedule, not in response to a fresh reply, so most webinar reminders are template messages by definition.
What this means for your reminders
Two things follow, and both are easy to miss. First, you need approved reminder templates ready before registration opens, not the night before your webinar. Second, and this is the part that trips people up, every contact has to opt in to hear from you on WhatsApp. You cannot scrape your registration list and start messaging phone numbers. The opt-in usually happens right on your registration form, where the registrant checks a box or taps a button agreeing to WhatsApp updates. Get the opt-in at signup and the 24-hour rule stops being a wall and becomes a system you plan around.
How do you invite people to a webinar on WhatsApp?
Start by setting up a free WhatsApp Business account, then collect opt-ins at registration and deliver your invites through broadcast lists rather than group chats. Here is the full sequence.
Step 1: Set up a WhatsApp Business account
Download the WhatsApp Business app, register the phone number you want reminders to come from, and fill out your business profile with your name, logo, and a short description. You should see a verified business profile with your details once it saves. This is the free tier, and it is enough to run reminders for a small to mid-size webinar by hand. Larger sends move to the WhatsApp Business Platform, which is the paid, higher-volume version that connects to sending tools.
Step 2: Collect opt-ins at registration
Add a WhatsApp opt-in to your registration form. A single checkbox (“Send me WhatsApp reminders for this webinar”) captures the permission the 24-hour rule requires and, just as usefully, the phone number you will message. If you skip this step, you have no compliant way to send anything later.
Step 3: Deliver invites through broadcast lists, not groups
Create a broadcast list of the registrants who opted in, and send your reminders to that list. Each recipient gets the message as a private one-to-one chat, so nobody sees anyone else’s number and nobody can reply-all to a crowd. Do not use a WhatsApp group for reminders. Groups turn into noisy side conversations, people mute them, and one annoyed registrant can derail the thread for everyone.
WhatsApp Business account vs broadcast list vs group vs channel: which is right for reminders?
For most webinars, a broadcast list is the correct tool. Here is how the four options compare for reminder delivery.
| WhatsApp method | Reach limit | Needs to save your number? | Privacy | Best for webinar reminders |
|---|---|---|---|---|
| Broadcast list | 256 recipients per list | Yes, each recipient must save your number | Private one-to-one messages | Yes, this is the default choice |
| Group chat | 1,024 members | No | Everyone sees everyone | No, too noisy and public |
| Channel | Unlimited followers | No | One-way, followers are anonymous | Useful for public announcements, not personal reminders |
| Business Platform (API) | Effectively unlimited | Opt-in, no manual save needed | Private one-to-one messages | Yes, once you outgrow manual sends |
The catch with a manual broadcast list is buried in that second column: every recipient has to have saved your number for the broadcast to reach them. At small scale you can manage that. Past a few hundred registrants it breaks, which is the point where hosts move to the WhatsApp Business Platform and a sending tool that handles opt-in and delivery without the manual save.
The reminder sequence that actually lifts show-up rate
More reminders on more channels beats one email every time. The hosts who consistently double their attendance are not sending better single messages. They are sending a timed sequence across WhatsApp, email, and SMS, so a registrant who misses one channel still gets caught by another.
Here is a reminder cadence that works, built around the moments people actually decide whether to show up:
- On registration: an instant confirmation with the date, time in their timezone, and a calendar link. This is the message that earns the opt-in trust.
- 24 hours before: a reminder that restates the one thing they will learn or get by attending. Lead with the benefit, not the logistics.
- 1 hour before: a short nudge with the join link. This is where WhatsApp starts outperforming email.
- 20 minutes before: the “we are starting soon” message. Keep it to one line and one link.
- At go-live: “we are live now, here is your link.” This single message recovers more no-shows than any other in the sequence.
- For no-shows, after the event: the replay link, sent only to the people who did not attend.
Now layer the channels. Send the same beats over email for the people who live in their inbox, over WhatsApp for the people who ignore email, and over SMS as the backstop that always gets delivered. Each channel has a different strength:
| Channel | Typical open behavior | Best role in the sequence |
|---|---|---|
| Opened in hours, easy to bury | Confirmation, the full details, the replay | |
| Opened in minutes, high open rate | The pre-live nudges and the "we are live" push | |
| SMS | Near-universal delivery, short | The final 20-minutes-and-live backstop |
The pattern that separates a 35% show-up rate from an 85% one is not the copy. It is the coverage. Mark Ling sees 85% attendance rates, against the roughly 35% industry baseline on file with that number. Same size list, more than double the room. The difference is that every registrant hears from him on the channel they actually check, at the moment the decision to show up is being made.
Why manual WhatsApp reminders break at scale
Sending WhatsApp reminders by hand works fine for one webinar. It survives your first 100 registrants. Run one webinar every week, or three sessions a day, and you become the reminder system: copying the broadcast list, checking who saved your number, firing WhatsApp at 20 minutes before while also sending the email and the SMS, then doing it all again for the next session. Miss the “we are live” message by ten minutes and you lose the exact registrants that message was built to save. The problem was never which message to send. It was that every one of them still depended on you remembering to send it, at the exact minute it mattered, to exactly the right people, across every channel at once, which nobody running a live event can actually do by hand.
This is the problem AEvent was built for. AEvent is not a webinar tool and it does not replace WhatsApp. It is the layer that runs the reminders around your webinar, on one timeline, automatically. You keep Zoom. You keep your WhatsApp tool. You keep your CRM. AEvent handles the sequencing.
Here is how it works in practice. AEvent’s Timeline Actions Engine lets you set the whole cadence once, timed to the event: 24 hours before, 1 hour before, 20 minutes before, at go-live. Each step fires the right channel. Email and SMS go out directly. Your WhatsApp reminders fire through the WhatsApp tool you already connect, whether that is a ManyChat, AiSensy, Wati, or Superchat integration, or a webhook to your own sender, so the WhatsApp message goes out on the same timeline as everything else instead of by hand.
The part manual reminders can never do is behavior. AEvent segments registrants by what they actually do, down to the viewing minute. Someone who watched five minutes and left gets a different follow-up than someone who stayed 40 minutes and clicked your offer but did not buy. The no-shows get the replay. The buyers get left alone. You build the logic once, and every session after that runs it for you, WhatsApp reminders included.
That is the whole idea: you present, and the reminders, the segmentation, and the follow-up run themselves around you.
Frequently asked questions
Can WhatsApp be used for webinars?
Yes, as a reminder and follow-up channel. WhatsApp does not host the webinar itself, but it is one of the strongest channels for getting registrants to show up, because messages get opened in minutes rather than sitting unread in an inbox.
What is the WhatsApp 24-hour rule?
A business can send free-form WhatsApp messages to a contact only within 24 hours of that contact’s last message. Outside that window, you can send only pre-approved template messages. Because reminders go out on your schedule, most webinar reminders are template messages and require the recipient to have opted in.
How many people can you send a WhatsApp broadcast to?
A manual broadcast list holds up to 256 recipients, and each one must have saved your number for the message to reach them. To send at higher volume without the manual save, you move to the WhatsApp Business Platform and a connected sending tool.
Do I need permission to send WhatsApp webinar reminders?
Yes. Every contact must opt in before you message them. The cleanest way is a checkbox or button on your registration form, which captures both the consent and the phone number at the same time.
Is WhatsApp or SMS better for webinar reminders?
Use both. WhatsApp wins on open rate and richer messages, while SMS wins on near-universal delivery. The strongest sequences send the pre-live nudges over WhatsApp and keep SMS as the final backstop, so no registrant slips through a single channel.
Stop losing the registrants you already earned
You did the hard part. You ran the ads, wrote the page, and got people to register. Losing them in the final 24 hours because a reminder did not fire is the most expensive leak in the funnel, because you already paid for every one of those names.
Set the opt-in, plan around the 24-hour rule, and send the sequence across WhatsApp, email, and SMS instead of betting everything on one email. When doing it by hand starts to break, here is what changes the moment the Timeline runs it instead of you:
- The 24-hour, 1-hour, and “we are live now” sequence fires automatically, every session.
- WhatsApp, email, and SMS run on one timeline, through the tools you already use.
- Every registrant is segmented by what they actually did, so the right message reaches the right person.
- You build the logic once, and every webinar after that runs it for you.
You keep the room you earned. You lose the manual labor. And you do not have to take our word for how it runs: watch AEvent fire a full reminder timeline on a live event before you commit a dollar or move a single contact.
