Preheader text is the short snippet of text displayed next to or beneath a subject line in most inbox previews, functioning as a second chance to earn an open after the subject line itself.
The Second Sentence of the Pitch
A subject line and preheader text work as a pair, not in isolation. The subject line earns initial attention, and preheader text either reinforces that hook or wastes the opportunity entirely:
- A strong pairing has the preheader add new information, not repeat the subject line in different words.
- A wasted preheader defaults to whatever text happens to appear first in the email body, often something unhelpful like “View this email in your browser.”
That default behavior is one of the most common, easily fixed mistakes in email design, since most platforms let a sender set preheader text explicitly rather than letting it default to the email’s opening line.
Preheader Text Length
Preheader text length that displays varies by client and device, but a safe target sits around 40 to 100 characters, since most inbox previews truncate anywhere in that range. Writing preheader text noticeably longer than that risks having the most important part cut off before the reader ever sees it, especially on mobile, where the visible preview space is considerably smaller than on desktop.
Preheader Text Examples
- Subject line: “Your cart is waiting” / Preheader: “Plus, free shipping on orders over $50 today only.” The preheader adds a genuinely new reason to click.
- Subject line: “New arrivals just dropped” / Preheader: “See what’s new before the rest of the list does.” The preheader adds urgency without repeating the subject.
Preheader Text Best Practices
Treat preheader text as required copy, not an afterthought, write it deliberately for every send rather than accepting whatever default text a template happens to produce. A preheader that echoes the subject line word for word wastes real estate that could be doing additional persuasive work.
Related terms:
A clear answer to what is preheader text worth remembering: it’s free real estate most senders waste by leaving it to chance rather than writing it on purpose. Adflipr’s email builder includes a dedicated preheader text field for every campaign, making it easy to set intentional preview copy rather than relying on a default.
