What WhatsApp number receives the conversation?

The phone number you've configured in Ads Manager for the WhatsApp Business account linked to the ad.

Can the user edit the pre-filled message before sending?

Yes. The pre-fill is editable; users can change it. Most don't.

Is the 256-character limit on the pre-fill hard?

Yes. Anything past 256 is silently truncated. Verify your pre-fill in the simulator or Ads Manager preview.

Does Click-to-WhatsApp work with carousel creative?

Yes. Carousel cards inherit standard 40-character headline, 20-character description per card.

WhatsApp Click-to-Chat Ad Character Limits

Click-to-WhatsApp ads route a user from a Meta placement directly into a WhatsApp conversation. The ad creative inherits Feed limits (125 visible primary text, 40 visible headline). The differentiator is the pre-filled message — the text that opens automatically in WhatsApp when the user taps the CTA. That pre-filled message caps at 256 characters.

Pre-filled messages are easy to underestimate. They look like a small detail, but they are the first message in the conversation. They set the tone, frame what the user is asking about, and determine how the receiving sales agent responds. A 256-character pre-fill that's unclear gets routed to the wrong queue. A clear, specific pre-fill gets a fast, relevant reply.

The recommended pattern is "[product name] inquiry" plus a single specific question. Example: "I'm interested in the Studio Bag. Is it available in black?" That's 60 characters and routes cleanly. Avoid generic openers — they're indistinguishable from spam in the receiving queue.

Last verified Apr 15, 2026

Placement

Primary text46/125clips at 100

Headline19/40clips at 25

Description0/30clips at 30

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Verified 2026 limits

Field	Hard max	Visible before truncate	Warn at
Primary text	125	100	90
Headline	40	25	22
Description	30	30	27

Source: https://www.facebook.com/business/ads-guide/messenger-inbox · Last verified 2026-04-15.

The pre-fill discipline

256 characters is plenty for a useful pre-fill. Most successful campaigns use 60–120 characters and include the specific product or query. Don't waste the pre-fill on greetings.

FAQ

What WhatsApp number receives the conversation?: The phone number you've configured in Ads Manager for the WhatsApp Business account linked to the ad.
Can the user edit the pre-filled message before sending?: Yes. The pre-fill is editable; users can change it. Most don't.
Is the 256-character limit on the pre-fill hard?: Yes. Anything past 256 is silently truncated. Verify your pre-fill in the simulator or Ads Manager preview.
Does Click-to-WhatsApp work with carousel creative?: Yes. Carousel cards inherit standard 40-character headline, 20-character description per card.