Free tool
Email spam word checker
Paste your subject line and email. Words and phrases that make mail look like spam are highlighted as you type, grouped by why they hurt. Free, no signup, and your text never leaves your browser.
Highlighted
Words are only part of it
Gmail, Microsoft and Yahoo decide mostly on your sender reputation and authentication. A clean email from a domain without DMARC, or with a high complaint rate, can still land in spam.
Context matters
One "free" in a newsletter is fine. Filters react to patterns: many trigger words together, shouting, and promises that sound too good to be true.
Check your domains too
Use our free bulk DMARC checker to see whether your DMARC, SPF and MX records are set up correctly.