kdp press check
KDP rejects subtitles stuffed with keywords like "Low Carb, High Protein, Air Fryer, Diabetic Friendly, Quick Meals." Your subtitle should describe what your book is about, not list every keyword you could rank for. Check yours instantly.
Your main book title (usually short)
Your subtitle (describes what the book is about)
Enter your title and subtitle to analyze
"Weight Loss Cookbook: Easy Healthy Recipes, Meal Plan, Low Carb, High Protein, Air Fryer, Diabetic Friendly, Quick Meals for Busy Families, 2026 Edition"
KDP sees this as: "You're trying to rank for every keyword imaginable instead of describing your actual book."
"Weight Loss Cookbook: Quick, Healthy Recipes for Busy Families"
KDP sees this as: "A clear description of what the book contains."
Your subtitle should tell readers what the book is about in plain English, not read like a search query.
60-80 characters is ideal. Longer than that, you're probably adding fluff or keywords.
A good subtitle gets APPROVED on first upload. A bad one gets REJECTED and costs you a month.