Email Preheader Preview
Preview how an email subject and preheader may appear in mobile and desktop inboxes.
About this tool
Preview email subject and preheader copy before sending. The tool shows mobile and desktop-style snippets, flags length ranges and emits a hidden preheader HTML helper for email templates.
Frequently asked questions
What is email preheader text?
Preheader text is the short preview copy that many inboxes show after or under the subject line. It should support the subject rather than repeat it.
How long should preheader text be?
A useful range is roughly 40-90 characters. Shorter text may waste preview space; longer text may be truncated on mobile.
How do I hide preheader text in the email body?
Use hidden preview text near the top of the email. The tool emits a simple hidden div snippet you can adapt for your template.