Email Subject Line Generator
10 subject lines with predicted open-rate scores.
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What drives email open rates in 2026?
Average email open rates sit between 20–40% depending on industry. The subject line is responsible for approximately 47% of whether someone opens your email. The preview text (preheader) accounts for another 24%. Everything else — sender name, send time, list quality — accounts for the rest. Investing time in subject line testing is one of the highest-ROI activities in email marketing.
Subject line length: mobile is everything
Over 60% of emails are opened on mobile. Mobile shows approximately 30–40 characters of a subject line before truncating. Front-load your key message — put the most compelling word or phrase in the first 30 characters.
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