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Will your wording trip a spam filter?

Paste a subject line and the body of your email. We highlight trigger phrases, capitals, exclamation marks and risky links, and explain why each one counts against you.

01 What filters read

Words matter less than you'd think.

Big mailbox providers decide mostly on who's sending and how recipients react. Content still tips the balance, especially on cold or bulk mail.

Phrases in combination

One “free” or “limited time” is harmless. Stack several pressure, money and too-good-to-be-true phrases and rule-based filters add them up.

Formatting signals

ALL CAPS, rows of exclamation marks, link shorteners and link-heavy bodies are cheap to detect, so filters still use them.

Private by design

The check runs entirely in your browser. Your copy is never sent to us or stored anywhere.

02 Questions

Common questions.

Something else? Write to us — a real person answers, usually the same day.

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Do spam words really send email to spam?+

On their own, rarely. Gmail and Outlook weigh sender reputation, authentication and engagement far more than vocabulary. Content filters still score wording, though, and on a new domain or a cold message a pile of trigger phrases can be the difference.

Is my email text sent anywhere?+

No. The analysis runs in your browser; nothing you paste leaves the page.

What's a good score?+

Low risk is the goal for anything you send in volume. Moderate is fine for an occasional personal note. If it says high, rewrite the highlighted phrases in plainer language. It usually reads better to humans too.

03 More free tools

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