Every "lead magnet ideas for authors" list on the internet hands you thirty formats stacked in a numbered post. Prequel novella, bonus scene, deleted chapter, cheat sheet, template, checklist, quiz, first-book-free. The list is not wrong. The list is the last question.
The first question is which reader you are trying to add to the list this month. A fiction reader who signed up to stay in the world you built wants nothing to do with a five-page cheat sheet on writing a query letter. A nonfiction reader who came to solve a problem wants nothing to do with a bonus scene set in a fictional town. Same author page, same "get the free download," two subscribers who never should have received the same welcome email.
The list of ideas is the last question, not the first
The top-ranking pages agree on the ideas. Kit, Atticus, Written Word Media, the Nonfiction Authors Association, a handful of Medium roundups. Between them they name most of the same thirty formats. They are ranked ideas without a way to choose between them.
What those posts skip is that a lead magnet is a promise about the reader on the other end. Fiction readers and nonfiction readers are looking for different kinds of promise. The fiction reader is buying more time inside a world they liked. The nonfiction reader is buying a shortcut to a result they want. The format follows from which promise you are actually able to keep.
Fiction: the magnet extends the world
For a fiction author, the whole trade is emotional continuity. The reader finished the book and did not want it to end. The magnet has to feel like the book kept going in an unexpected direction, and only the mailing list knew where.
Three formats that hold up in practice.
The prequel or bonus story. Fifteen to fifty pages set in the same world, before or after the book, ideally featuring a secondary character the reader already cares about. The prequel doubles as an on-ramp for new readers who have not bought the main book yet. It is the closest thing to a "free first book" without giving away the book itself.
The deleted or extended scene. A chapter that was cut in edit, a rewritten ending, an alternate epilogue. Fifteen minutes of read time, a short authorial note about why it was cut, and the reader knows something the paperback owner does not. It reads as behind-the-scenes without needing a newsletter interview.
The world guide. The map. The family tree. The timeline of the war before the war. The glossary of the invented language, with pronunciations. For series with a dense world, the guide is the highest-value magnet you can ship, because it becomes a reference the reader keeps open while reading the next book.
What all three share: they are useless outside the world of the book, and they cost the reader nothing to accept because they signed up hoping the book would keep going.
Nonfiction: the magnet delivers the payoff faster
For a nonfiction author, the whole trade is problem-solving time. The reader has a specific pain. The book solves it in two hundred pages. The magnet solves a slice of it in ten minutes, and it demonstrates the method the book uses.
Three formats that hold up.
The extracted worksheet. The single template, checklist, or worksheet that lives inside the book as an exercise, pulled out as a standalone PDF with a page or two of instruction. The book on productivity ships a weekly review template. The book on freelance pricing ships the proposal spreadsheet. The reader gets to try the method, then wants the reasoning behind it.
The best chapter, formatted for reading. One chapter, chosen because it stands alone and answers the subject-line question of the whole book. A first chapter is a weak version of this because a first chapter usually sets up. The chapter that opens with the sharpest promise, edited slightly to make sense without the preceding pages, is a much stronger sample.
The cheat sheet. Two to four pages of the distilled answers the book expands on. Not the whole argument. Just the twenty rules, the ten questions, the checklist. The reader who is not ready to read a book is often very ready to print a card and stick it to the wall.
What all three share: they are useless if the reader is not actually facing the problem, and they cost the reader nothing to accept because they are already looking for shortcuts.
The conversion math: format matters less than intent
Authors sit near the top of the industry table for email. MailerLite's 2025 benchmarks, computed across roughly 3.6 million campaigns, put the author benchmark at 43.14% opens and 2.75% clicks, within a rounding error of the 43.46% median across all industries. Whatever magnet you ship, the list itself is a category that opens. What is scarce is the click, and the click is where the download signal actually lands.
The second number, from MailerLite's analysis of more than 41,000 signup forms: the average dedicated lead magnet page converts around 22%. Ebooks, reports, and interactive tools cluster within a few points of each other. The spread between formats is smaller than most listicles imply. What moves the number is whether the promise on the page matches the reader who arrived.
The tag decides the welcome sequence
Every lead magnet is a pretext for a welcome sequence. The sequence is where the sale happens. A magnet without a sequence is a PDF in a downloads folder. A magnet with the wrong sequence teaches a fiction reader to expect a productivity cadence and to unsubscribe on send three.
The two tags most author lists never write, even though the SERP quietly assumes them.
fiction-world-N. Written on the reader who downloaded the bonus scene, the prequel, or the world guide. This tag receives a slow drip of in-world content, next-book news, and ARC opportunities. Not writing advice. Not craft essays. This reader is here for more of the story.
nonfiction-topic-N. Written on the reader who downloaded the worksheet, the sample chapter, or the cheat sheet. This tag receives a short sequence that demonstrates the method the book teaches, with a soft offer to buy the book on the third or fourth send. This reader is here for the payoff.
Same list, two tags, two welcome sequences. The reader who showed up for the world of your book does not get emailed about your public-speaking fees. The reader who came for the freelance pricing template does not get emailed about your fantasy trilogy's release week.
The one to build first
For a fiction author with a book already out, build the bonus scene or the prequel first. It is the fastest to produce, doubles as a sample chapter for new readers, and every subscriber it adds is a reader who has already finished a book and wants more.
For a nonfiction author, build the extracted worksheet or the cheat sheet first. It is the format that tests whether your method actually helps the reader in ten minutes. If it does, the book sells itself on send four. If it does not, you find out before you have shipped the book to a lot of strangers.
For an author who writes both, build two. One for each side of the list. Do not combine them into a single "author starter kit" that promises everything. The starter-kit magnet converts the worst, because a vague promise attracts a subscriber the sequence cannot serve.
The idea list is the last question. The first is which reader the list is short of this month. A publishing OS is the setup where the page, the tag, and the welcome sequence live in the same system, so a fiction reader signing up for the bonus scene and a nonfiction reader signing up for the worksheet each land in the right sequence from the first email. Nashra's Magic Links handle the page-to-tag step, your subscriber list holds the tag, and automations ship the sequence keyed to it. If you are still deciding whether the list is worth the work, the math on subscribers versus followers is where to start.
