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titlecase
3 plugin
WP Title CaseAutomatically applied title case rules to WordPress titles. This plugin automatically updates Page and Post titles to follow title casing rules.
TDLM Title CaseChange your post title to correct title case or all lowercase or all uppercase.
FriendlyCaseReformat titles from 'ALL CAPS' to 'All Caps' and enable friendly, word capitalization in posts, pages and more.