How to use this tool
Enter your subject and preheader, then compare them at different character cutoffs. Put the key idea early and use the preview to add context rather than repeat the subject. For example, pair “Your inbox setup checklist” with “Choose sources, apply labels, and plan your first review.”
Is this an exact Gmail or Outlook preview?
No. This is a text drafting aid. Real inboxes truncate by available space and font metrics, not a fixed number of characters. Send a test email to inspect actual rendering in the email clients your readers use.
More help for your workflow
Explore the newsletter guides or try another free email tool.