Ask What are the best practices for length of email subject lines?

[niash45]

The length of an email subject line can impact its success. You should aim for a subject line with fewer than 60 characters. Short subject lines perform better on mobile devices. You must make every word count. Your subject line should focus on clarity and relevance. You can test different lengths to see what works best for your audience. Long subject lines often lose attention. You must avoid filler words or unnecessary phrases. A clear and concise subject line increases open rates. You should consider how your audience views emails. A well-crafted subject line captures attention quickly and effectively.

 

[Daniel084]

The 60 character rule makes sense, but I think it also depends on the email platform people are using. Some email apps show more characters than others, and desktop views usually display longer subject lines than phones do. What really matters is putting the most important information at the beginning. If you bury the main point at the end, people might not even see it before deciding whether to open the email.

 

[Anthony Joshua]

Best practice I follow is keeping subject lines short but informative, ideally between 35–60 characters. It's enough to hook readers but not too long that it gets cut off. Action words and curiosity triggers work well in that space. Longer subject lines can work if you really need more context, but mobile users often only see the first 30–40 characters, so front-load the important info. Testing is key to see what works for your list.