Messaging
Email subject line length
Keep email subject lines to about 50 characters or fewer. There is no practical limit, but inboxes cut long subjects off.
Visible length: Phones often show only about 30 to 40 characters of a subject line.
Email subject line character counter
Paste your text to check it against the 50 character guideline. It runs in your browser, so nothing is uploaded.
Good to know
Email subject line facts
- Desktop inboxes show around 60 characters, and phones fewer.
- The preview text after the subject is just as visible, so use it to continue the thought.
Tips
Writing a better Email subject line
- Put the most important words first in case the end is cut off.
- Avoid all caps and lots of punctuation, which can trigger spam filters.
FAQ
Email subject line: common questions
What is the Email subject line character limit?+
Keep email subject lines to about 50 characters or fewer. There is no practical limit, but inboxes cut long subjects off.
Do spaces and emojis count toward the Email subject line limit?+
Yes. Spaces, punctuation, line breaks and emojis all count. The counter on this page counts each emoji as one character.
What happens if an Email subject line is over 50 characters?+
Nothing breaks, but inboxes cut off long subject lines, especially on phones.
How much of an Email subject line is visible?+
Phones often show only about 30 to 40 characters of a subject line.
Limits last checked October 2026. Platforms change them from time to time, so check the Email editor if a number looks off.
Other character limits
Counting words instead? Use the Word and Character Counter or see how many pages any word count fills.