Preheader Text Optimizer

Craft preview text that complements the subject and fills inbox space.

How it works

Make preview text help the subject — not hurt it

Enter subject + preview (preheader) → click Test preview text → see if it complements the subject, fills inbox space, or looks like footer junk.

Or start from a real-life example

Results appear here after you click Test preview text.

Ready to send with MailShrine?

New accounts get free signup credits. Fix the copy, then send from MailShrine.