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Email Subject Line Tester – Preview & Length Check

Marketing Writing email marketing preview subject line tool
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Email Subject Line Tester

Test your email subject line for length, preview how it looks in inboxes, and improve open rates.

0 / 200 characters
Good < 50 chars Acceptable 50-70 Too Long > 70
Ideal length for most clients: 40-60 characters. Mobile may truncate after 30-40 chars.
Live Preview
Desktop (Gmail / Outlook)
Mobile (iOS Mail / Gmail App)
Use personalization, urgency, or curiosity to boost opens. Avoid spammy words.

Frequently Asked Questions

40-60 characters is the sweet spot. Most email clients (Gmail, Outlook) display around 60 characters before truncating. Mobile devices typically show only 30-40 characters, so place your most important words near the beginning.

  • Use personalization (like the recipient's name).
  • Create a sense of urgency or curiosity.
  • Keep it concise and front-load important words.
  • Avoid all caps, excessive punctuation, and spam trigger words.
  • Test with A/B variations and measure open rates.

Yes. If the subject is too long, it gets cut off and the message loses impact. Very short subjects can also underperform unless highly compelling. The ideal length balances information and intrigue without being truncated in most inboxes.

Emojis can increase open rates by making subjects stand out visually. However, they should be used sparingly and tested across devices, as some email clients may display them differently or not at all. Use emojis that reinforce your message.

Avoid spam trigger words like "Free", "Act Now", "Limited Time", "!!!" or overly promotional phrases. Using them may send your email to the spam folder. Craft authentic, value-driven subjects instead.
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