Email Subject Checker
What to provide first
Paste your subject line
Enter the exact subject you plan to send. You can also add preview text if you want a little more context for the checker.
Great for quick draft review
Use it before newsletters, support replies, outreach, invoices, reminders, or account notices to catch spammy wording or weak clarity.
Need a message scan too?
After improving the subject line, scan the full message in our Email Spam Checker.
What this tool does
It scores your subject line for clarity, length, urgency pressure, spam-like wording, excessive punctuation, and heavy capitalization. It is a quick writing aid, not a guaranteed deliverability test, but it helps catch common weak spots before sending.