Newsletter Preview Builder
See how your from name, subject line, and preheader appear in the inbox, with live length checks so nothing gets cut off.
Design the whole inbox line, not just the subject
The decision to open an email happens in a fraction of a second, based on three things shown together in the inbox: who it's from, the subject line, and the preheader snippet. Most people obsess over the subject and ignore the other two. This builder shows all three exactly as they'll appear, so you can craft them as one persuasive unit instead of guessing.
Watch the live length meters — keep the subject around 30–50 characters and the preheader under about 90 so neither truncates on mobile, where most opens happen. Use the preheader to extend the subject's promise rather than repeat it, and keep the from name recognizable and consistent.
Private and instant
Your copy stays in your browser — nothing is uploaded.
Frequently Asked Questions
What is a preheader?
The preheader (or preview text) is the snippet shown after the subject line in most inboxes. It’s prime real estate — a second hook that, used well, noticeably lifts open rates.
How long should the subject and preheader be?
Keep the subject around 30–50 characters and the preheader under about 90–100 so both display fully on mobile, where most email is opened.
Why does the from name matter?
People decide whether to open largely based on who sent it. A recognizable, consistent from name builds trust and improves open rates more than clever subject lines alone.
Is this tool free and private?
Yes. The preview is generated in your browser — nothing is uploaded or stored.
Count and check any copy as you write, on any site.