Email Mobile Preview Checker
See how your subject line and preheader will look on a mobile inbox before you send.
Enter Your Numbers
Results
Subject Characters
48
Preheader Characters
68
Mobile Subject Preview
Your summer sale starts now — …
Mobile Preheader Preview
Plus free shipping on orders over $50. S…
How It Works
Mobile inboxes typically display 25–35 characters of subject line and 35–45 characters of preheader. Keep your most important words at the beginning to avoid truncation.
Optimising Email Previews for Mobile
Over half of all emails are opened on mobile devices. If your subject line or preheader is too long, the most compelling part may be cut off and engagement will suffer.
Preview your email on mobile before every send to ensure the offer, benefit, or curiosity hook is visible in the first few words.