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Draft back-cover copy from 30 original premises — romance, mystery, thriller, fantasy, sci-fi, horror, literary, historical, contemporary, and young adult. Choose a tone and a length. The result is a hook you can rewrite, not a synopsis of a finished book.
For the plot behind the jacket, use the Story Plot Generator. For a title, use the Novel Title Generator. More tools are in Writing & Fandom.
Last updated: October 12, 2026 · Published: 2026-04-27 · Updated: 2026-10-12
Exact matches for All genres and All tones: 30.
Set filters and generate a back-cover draft
A book blurb is the sales paragraph on a jacket or a store page. It names a person, a want, and the trouble already in motion, then stops. A synopsis does the other job: it tells an agent the whole plot, including the ending, usually in one to two pages. This generator writes blurbs from 30 seeds. Working titles such as The Bakery Lease, Forty Minutes, and The Group Chat Evidence label the premises. They are not published books.
Short is one paragraph. Medium adds a second. Long adds a coda about the theme. Genre is the shelf (Romance, Mystery, Thriller, Fantasy, Sci-fi, Horror, Literary, Historical, Contemporary, Young adult). Tone is the voice (Dark, Hopeful, Witty, Romantic, Gripping, Lyrical). A romance can be witty, hopeful, romantic, or dark. If your two filters have no seed, the note under the buttons says so and names the wider pool.
Kindle Direct Publishing limits the book description to 4,000 characters. The words above a store page's Read more control have to work alone. Rewrite every role and place before the draft goes on a cover. The tool does not know your ending, and the blurb should not tell it.
Three steps from a shelf category to a paragraph you can edit.
Pick one of 10 genres and one of 6 tones. Read the match line. If it says there is no exact seed, you are looking at a wider pool and the note names which filter was relaxed.
Short is the hook alone. Medium adds the escalation. Long adds a theme line. Generate up to 20 and read the first two sentences aloud.
Swap the role, the place, and the stakes for your manuscript. Cut anything that reveals the ending. Then check length against the cover or the 4,000-character KDP description field.
The same building blocks, so a short draft and a long draft of one seed are easy to compare.
A label for the seed, such as Forty Minutes or The Unsent Notice. It is not your book title.
Who wants something, where they are, and what is already in the way. Every length includes this.
Medium and long add a second paragraph: the opposing force, the stakes, and a question.
Long adds one theme line. It names the argument of the book and still withholds the ending.
Genre and tone, such as Romance · Dark. 10 genres and 6 tones.
A line telling you to replace the role, place, and stakes. The tool does not know your manuscript.
The seeds behind the paragraphs. Generating fills a template from the want, the obstacle, the stakes, and the clock.
| Premise | Genre | Tone | They want |
|---|---|---|---|
| Crayon Signatures | Contemporary | Hopeful | a farmers’ market lease that is not a punishment for caring |
| The Courthouse Roof | Contemporary | Witty | a raise and one night without an emergency call |
| The Shared Drive | Contemporary | Dark | one story that is not a sponsored post |
| A Treaty in Salt | Fantasy | Hopeful | one meal that makes two armies remember they are only hungry |
| Maps That Lie | Fantasy | Lyrical | a route home that will not unmake the world on the way |
| The Outlawed Language | Fantasy | Dark | one honest verdict that does not need a war to execute |
| The First Proof | Historical | Hopeful | a pamphlet to arrive before the censors finish breakfast |
| The Same Hand Shape | Historical | Gripping | one tent where the triage is honest and the water is clean |
| The Unsent Notice | Historical | Lyrical | one notice posted before the fishing boats leave |
| A Storm With a Name | Horror | Gripping | a season without a new category of storm with a name like a person |
| The Third-Floor Room | Horror | Dark | to get her patient to morning without the building waking |
| The Walls Learning to Speak | Horror | Lyrical | one conversation that is not a trap |
| The Unauthorized Catalog | Literary | Witty | a quiet shift and a painting that is not winking on purpose |
| Unopened Boxes | Literary | Lyrical | to return one letter the family never sent |
| Chapter One Was Dead | Mystery | Witty | a sponsor who does not need blood for clicks |
| Deleted Histories | Mystery | Dark | a client with a small problem and a small fee |
| Faces in the File | Mystery | Gripping | a clean retirement and a small apartment by the water |
| The Wrong Color Flowers | Mystery | Lyrical | a winter without a new stone that should not be there |
| Her Own Address | Romance | Dark | a weekend without a voice memo from a man who needs saving |
| The Bakery Lease | Romance | Romantic | a quiet life and one honest apology |
| The Barn Episode | Romance | Witty | a quiet life and a porch that will not need emergency repairs at 2 a.m. |
| The Last Honest Hour | Romance | Hopeful | a relationship that is not a segment |
| A Real Sky | Sci-fi | Hopeful | a curriculum that will not be overwritten by a committee in orbit |
| The Last Safe Burn | Sci-fi | Dark | one honest manifest and a way to sleep again |
| Twelve Easy Payments | Sci-fi | Witty | a final protocol that is not 90% marketing |
| Forty Minutes | Thriller | Gripping | safety for her patient—and for the kid in the back seat |
| No Hashtag | Thriller | Dark | to get the client to the border without a hashtag |
| The Private Island Map | Thriller | Gripping | a passport that is still valid in the one country the story names |
| The Group Chat Evidence | Young adult | Gripping | a hearing that reads the whole chat, not the worst screenshot |
| The Yearbook Printer | Young adult | Hopeful | a fair shot at the science fair and a friend who will keep a secret |
The words agents, cover designers, and KDP's description field do not use interchangeably.
Reader-facing sales copy. In US publishing it is often called back-cover copy or the book description. In UK publishing, 'blurb' is the usual name for the jacket text. It creates want. It does not tell the ending.
A plot summary for an agent or editor, usually one to two pages, often in present tense, including the twists and the ending. A synopsis and a blurb answer different readers. This generator writes only the blurb.
A one-page letter to an agent. It usually includes a plot paragraph, the genre, the word count, two or three comparable titles, and a short bio. The plot paragraph can grow out of a medium blurb. The comps and the bio do not belong on the jacket.
The description field in Kindle Direct Publishing, limited to 4,000 characters. KDP allows basic HTML such as bold and line breaks. Amazon store pages show the opening and hide the rest behind Read more, so the first sentences do the selling.
A paperback back cover is commonly edited to about 150–250 words after the draft exists. That is a design target, not a rule of this tool. Short, medium, and long here mean one paragraph, two paragraphs, or two paragraphs plus a coda.
The opening that states a person, a want, and an obstacle before the reader has a reason to stop. In this tool the short length is the hook alone. Example shape: a mapmaker in a kingdom of folded rivers who needs a route home.
What is lost if the protagonist fails. The seeds name stakes separately from the want, such as a witness who never came forward, or a cousin already on a boat that should have stayed tied.
Genre is the shelf: romance, mystery, thriller, fantasy, sci-fi, horror, literary, historical, contemporary, or young adult. Tone is the voice: dark, hopeful, witty, romantic, gripping, or lyrical. A romance novel can carry a dark tone. Her Own Address is that pair.
Two or three recent books that tell an agent where yours sits. They belong in a query letter. Naming them inside the blurb usually reads like a review quote you did not earn.
The ending, the hidden identity, or the late reversal. Leave it out of jacket copy and the store description. Put it in the synopsis, where the reader has asked to be told.
Use the draft for the shopper. Keep a second document for the agent.
| Pair | First | Second |
|---|---|---|
| Blurb and Synopsis | Blurb. Sells the book and stops at the pressure. The reader is a shopper. | Synopsis. Tells the whole plot, including the ending. The reader is an agent or editor. |
| Blurb and Query letter | Blurb. Jacket or store page. No bio, no word count, no comps. | Query letter. One page to an agent. The plot paragraph can start here, then you add metadata and comps. |
| Short and Long | Short. One paragraph for a hook, a flap line, or the text above a Read more break. | Long. Two paragraphs plus a theme coda, a start toward the online description. |
| Genre and Tone | Genre. Where the book is shelved. Romance is a promise of a relationship story. | Tone. How the sentences feel. Romantic, witty, and dark are all available inside romance. |
A generated paragraph is a shape. These four edits make it yours.
Change 'a second-chance baker' into your character's name and one concrete detail. Readers buy a person, not a job label.
The draft stops at pressure. If your rewrite says who wins, move that sentence to the synopsis.
Store pages hide the rest of a description behind a Read more control. The hook has to carry the want, the obstacle, and the place before that click.
Use short or a trimmed medium for a paperback back cover, often about 150–250 words after editing. Use the long draft as a start for the online description, then stay inside KDP's 4,000-character limit and add bold or line breaks only after the words are final.
The Story Plot Generator is for the writer who needs the beats, including how the book ends. This page is for the shopper who needs a reason to open the book. The Hook Generator is a smaller tool when only the first sentence is soft. The Novel Title Generator belongs on the cover above the blurb, not inside it.
A practical order is plot, then blurb, then title, then a trim to the cover or to the 4,000-character description field. Comparable titles wait for the query letter.
What the generator on this page actually contains.
Working titles from The Bakery Lease to The Unsent Notice. They are seeds, not published books.
Romance, Mystery, Thriller, Fantasy, Sci-fi, Horror, Literary, Historical, Contemporary, Young adult. Tones: Dark, Hopeful, Witty, Romantic, Gripping, Lyrical.
One paragraph, two paragraphs, or two paragraphs plus a coda.
The note under the filters says when a genre and tone have no seed.
Duplicates can stay on, or come off so each matching seed appears once.
No account. The drafts you generate stay on your device.
Blurb versus synopsis, KDP length, exact filters, and what to edit before a cover.
Explore more tools in the directory.
7,564 book title ideas to sit above the blurb on a cover mockup.
The beats behind the blurb, including the ending you leave off the cover.
A sharper first sentence when the opening paragraph feels soft.
A relationship arc when a romance blurb needs a clearer conflict.
A threat and a setting when the horror draft needs a more specific fear.
A title when the draft is for a fic listing rather than a retail jacket.