Lowercase vs Uppercase in Emails: Best Practices
Practical capitalization rules for clearer email communication and better engagement.
Subject Lines
Use sentence case or title case consistently. Avoid all-caps subject lines because they may look spammy and reduce trust.
Body Text
Use standard sentence case for readability. Reserve uppercase for acronyms and short emphasis only.
Buttons and CTAs
Sentence case CTA labels usually feel more approachable in product and support emails.
Related resources: Lowercase Converter • Sentence Case for UI • What UPPERCASE Means Online
Frequently Asked Questions
Do all-caps subject lines improve opens?
Usually no. They can trigger spam-like perception and reduce click trust.
What is safest for professional email?
Sentence case body copy with consistent capitalization in headings and CTAs.