Message Ads

Message ads are LinkedIn Sponsored Messaging ads delivered to a member's inbox as a single message with one call-to-action button. LinkedIn's ad guide lists a message of up to 1,500 characters, a call-to-action limit of 20 characters, and an optional 300 by 250 pixel banner that shows only on desktop. The message arrives from a sender profile you choose, and the guide says it is shown to members who are logged in. You build it in Campaign Manager by writing the subject, body, and button, then choosing the destination, which can be a page or a Lead Gen Form. The format is one message and one action. The subject line is the first thing the member sees, so write it as plainly as a message from a colleague.

Delivery follows LinkedIn's rules. Sponsored Messaging appears in LinkedIn Messaging on desktop and mobile, only to members who are logged in. The banner does not display on mobile messages. For targeted members, the messages move to the Archived Messages folder after 60 days. Sender approval may be needed, particularly if the ad account belongs to a Business Manager. In the EEA and Switzerland, Sponsored Messaging reaches only members who opted in to receive it, so audiences there shrink. Personalization macros, such as the member's first name, fall back to a generic label when a member has turned off ad personalization. Check the message on both desktop and mobile, since the banner appears only on desktop.

Message ads depend heavily on targeting, since each send is a one-to-one interruption and costs more than an impression in the feed. They work best against a tightly defined list, such as a company list with a function and seniority filter, with an offer that matters to that reader: an event invitation, a high-value report, or a consultation. Compared with Conversation ads, they have one button instead of branches, which makes them simpler to build and read. Compared with a feed ad, they carry more text, and the format makes the message feel personal. The reader sees it alongside real messages from colleagues, so tone matters. Limit the number of sends to the same person, because repeated messages can lead people to ignore or hide your ads.

The usual mistake is treating it as cold email at scale. Because each send is costly, a broad list and a generic pitch burn budget fast. Another mistake is a long, product-focused body with a vague button. Write like a person: one clear reason for reaching this reader, one specific offer, and a button that says what happens next. A third mistake is a sender who looks like a brand and not a person, which lowers trust. A fourth is ignoring how often members receive messages. Overuse of the same list can irritate people, who can then hide your ads. Do not stuff the message with links or features, and let the single button carry the action.

Start small: a list of a few thousand members you would be glad to meet, a short message under 100 words, and one offer. Write the subject so it sounds like a colleague, not a campaign. Send it from a real person's profile if that is permitted. After a week, look at the open and click rates and the cost per click or lead, and read any replies. If the audience is right but results are weak, rewrite the first two lines. If clicks are good but conversions are poor, check the destination. Test one change at a time, and keep the list tight. Reply promptly to any person who answers, as a real reply turns a sponsored message into a conversation.