Preheader text is the short text associated with the top of an email and commonly used to influence the preview snippet shown beside or below the subject line in an inbox.
Preheader textPreheader text
Email terminology is inconsistent. Many marketers use preheader and preview text interchangeably. A more precise distinction is:
- preview text: the snippet the inbox displays near the subject
- preheader: content placed at the beginning of the email body, which can be visible or hidden and can be used to control that preview
The practical job is the same: give the subject line a useful second line instead of letting the inbox choose arbitrary body text.
Write the subject and preview as a pair
A weak pair repeats itself: Subject: Your order shipped Preview: Your order has shipped A stronger pair adds information: Subject: Your order is on the way Preview: Track package #A1042 and see the latest delivery estimate For a promotion: Subject: Linen week starts now Preview: 20% off shirts and trousers through Sunday The subject creates the primary promise. The preview can add scope, timing, context or a secondary reason to open.
The inbox controls the final display
You cannot guarantee exactly how much preview text a recipient sees. Email clients, device width, inbox settings and other UI can change the visible length. Some clients may also combine your intended preview with later body content. Put the most important information early. Do not rely on the last 5 words to carry a critical condition such as an expiry date.
Avoid accidental boilerplate
If you do not set preview text, clients may pull the first available body content. That can produce snippets such as:
- “View in browser”
- navigation labels
- image alt text
- “Having trouble viewing this email?”
- raw-looking template content
This is one of the easiest email-quality mistakes to prevent.
Personalization needs a fallback
Preview text can use personalization, but only if the fallback still reads naturally. Weak: > {{ first_name }}, the item you viewed... If the first name is missing, the preview can begin with punctuation or a blank. Better logic renders a complete sentence both with and without the personalized value.
Also avoid putting sensitive or surprising customer data into preview text. The inbox snippet can be visible on lock screens or notification surfaces depending on the recipient’s device settings.
What does this page teach beyond a generic glossary definition?
It teaches preheader/preview text as an inbox fallback-control problem, not merely a second subject line. The writer pairs it with the subject, front-loads meaning for truncation, and prevents the client from substituting accidental boilerplate such as “View in browser.”
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