Is your blurb too long, or breaking KDP rules you didn't know about?
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R. S. Breed Founder
Your book description has two jobs: make a reader want the book, and get through KDP's review.
The free blurb checker helps with both: https://bervet.com/tools/blurb-checker
Paste your description and you get:
- Length against KDP's 4,000-character limit (HTML tags count towards it, which catches people out)
- Sentence length, because long, winding sentences are where blurbs lose readers
- A reading-ease score
- A check for what KDP's rules don't allow in a description, such as links, review quotes, prices and emojis
A blurb isn't a synopsis. It doesn't need the ending or every subplot: who it's about, what they want, what's in the way, and what it'll cost them is usually enough. Short paragraphs read better on a phone, which is where most people see it.
Nothing is saved. No account needed. When it's ready, the description formatter turns it into the HTML KDP accepts.