Email Subject Line Tester

Type a subject line and get an instant score — length, spam-trigger words, emoji, ALL-CAPS and an inbox preview. Fix issues before you hit send.

Your subject line

Sender name (optional)

Preheader text (optional)

Enter a subject line to see results.

Runs entirely in your browser. Nothing is uploaded.

How it works

STEP 1

Enter any email subject line in the box. Results update as you type.

STEP 2

See instant feedback on length, spam words, emoji, ALL-CAPS and overall score.

STEP 3

See how your subject appears in Gmail, Apple Mail and Outlook-style inboxes before you send.