Free book blurb generator for indie authors
Paste your blurb draft, pick your genre and tone. This free book blurb generator scores your draft on hook strength, stakes clarity, genre signals, and length — then restructures it using the proven protagonist → inciting incident → stakes → impossible choice spine. Everything runs in your browser; your draft never leaves this page.
How the scoring works
Four checks, each scored 1–10, based on the same craft rules professional copywriters use for back-cover copy. No AI, no servers — just pattern checks running in your browser.
Hook strength
Does your first line put a person and a problem on the page? Openings with rhetorical questions or "in a world" throat-clearing score low.
Stakes clarity
Can a stranger tell what your protagonist stands to lose? Concrete, time-bound loss scores high; vague "everything they hold dear" scores low.
Genre signals
Does your blurb speak your shelf's language? Each genre has signal words that tell the right readers "this one is for you."
Length check
150–200 words is the sweet spot for book blurbs. Under 100 feels thin; over 250 usually means you're summarizing instead of selling.
Want 100 blurbs to learn from?
The Blurb Book for Indie Authors includes 100 fully written, annotated example blurbs across 10 genres — each one taken apart line by line so you can see exactly why it works, plus genre formulas, a pre-publish checklist, and an honest A/B testing guide for Amazon.