Email Subject Line Length & Previewer
Check how your email subject and preheader fit in a mobile inbox. Switch between iOS Mail-style and Gmail-style previews while tracking characters and words.
Mobile inbox preview
Your text stays in your browser. Previews use a 375 px phone layout.
Make the first words count
Put the most useful information first. Long subjects and preheaders may be cut off. These are representative inbox layouts: available space changes with screen size, font settings, sender length, and email client version. Character counts include spaces and use Unicode code points; words are separated by whitespace.
Make your preheader add something new
For a subject such as Your summer guide is here, try a preheader such as Explore five ideas for your next weekend away. Lead with useful information because screen size and email settings affect how much text is visible.