What is the ideal email subject line length? +
The sweet spot is 30–50 characters. Mobile devices show around 40 characters before cutting off. Most email opens now happen on mobile, so keeping it short ensures the full subject line is visible in the inbox.
What are power words in subject lines? +
Power words are emotionally charged words that trigger curiosity, urgency, or desire. Examples: "secret", "exclusive", "proven", "instantly", "discover", "you", "new", "results". Using 1–2 power words can significantly lift open rates.
Do emojis help email open rates? +
Yes — a single relevant emoji can increase open rates by 25–30% by standing out in the inbox. Avoid using more than 1–2 or they can trigger spam filters in some email clients.
Should I use ALL CAPS in subject lines? +
No. ALL CAPS words are a major spam trigger and look aggressive to recipients. Use title case or sentence case instead for a natural, trustworthy feel.