Email List Growth Guide
The right reader magnet attracts exactly the readers who will love your books. Here's how to build one.
50%+
Welcome email open rates with a reader magnet
3–6 mo
Ideal build time before launch day
$20/yr
BookFunnel starting cost for delivery
From concept and format to delivery and list growth.
A reader magnet is a free piece of content you give to readers in exchange for their email address. It's the offer that turns a browser into a subscriber. The concept is simple; the execution is where most authors get it wrong.
What makes a reader magnet work: it has to be something your ideal reader genuinely wants, not just something convenient for you to produce. A 5,000-word prequel that answers a question your series readers always ask outperforms a generic "free chapter" every time. Specificity is the key. The more precisely your reader magnet speaks to the kind of reader you want on your list, the better the quality of subscribers it attracts.
What kills a reader magnet: being too generic, too short to feel like real value, or completely disconnected from your books. A thriller author whose reader magnet is a "10 writing tips" guide is attracting writers, not thriller readers. Match the magnet to the reader you're writing for.
Fiction reader magnets work best when they expand the world readers already love — or open the door to a world they haven't entered yet.
Prequel novella or short story: The most powerful option. A story set before your series begins lets new readers sample your writing without spoilers and gives existing fans bonus content. Keep it 5,000–20,000 words — long enough to feel like real value, short enough to produce. Bonus scenes: A deleted scene, an alternate POV, or a "what happened next" scene that didn't make the final cut. Fans love these; they feel exclusive. Short story collection: Three or four short pieces in the same universe. Works particularly well for fantasy and sci-fi where world-building is a draw. Extended epilogue: For romance especially, readers crave more of the HEA. A 3,000–5,000-word extended epilogue converts exceptionally well.
Non-fiction reader magnets work differently from fiction ones. The reader isn't looking for a story experience — they want a problem solved or a shortcut delivered.
Checklist: Fast to create and high-perceived value. A "Book Launch Checklist" or "First Chapter Hook Checklist" gives immediate utility. Keep it to one page, well-designed. Template: Even higher value — something the reader can fill in and use immediately. Query letter template, book proposal outline, chapter structure template. Guide excerpt: The first chapter or two of your non-fiction book, properly formatted and presented as a standalone. This works best when the excerpt delivers a complete, actionable idea. Mini-course: A 3–5 email sequence that teaches a specific skill. Doubles as your welcome sequence and delivers the reader magnet over several days, improving engagement.
Your reader magnet needs a home — somewhere to host the file and a mechanism to deliver it automatically to new subscribers.
Email platform delivery: The simplest option. Upload your PDF or EPUB to MailerLite, ConvertKit, or your email platform of choice, and set it as an attachment in your welcome email's automation. Works well but limits file size and doesn't allow reader to re-download later. BookFunnel: The preferred option for most fiction authors. BookFunnel handles hosting, delivery, and even device-specific delivery (it helps readers get EPUBs onto their Kindle, Kobo, or phone). It integrates directly with MailerLite, ConvertKit, and most major email platforms. Plans start at $20/year. Dropbox or Google Drive link: The bare-minimum approach. Works, but feels less professional and you lose the delivery tracking BookFunnel provides.
Your reader magnet only works if readers find it. The most valuable placement is inside your books themselves — both at the front and back of every title you publish.
Front matter placement: a short paragraph in the first few pages offering the free bonus. This captures KU readers who may not reach the back matter. Back matter placement: a full call-to-action page after the story ends, with the URL and a description of what they'll get. Make both placements feel like a natural extension of the reading experience, not an interruption.
Beyond your books: your reader magnet link should be in your Amazon author bio, your Goodreads profile, your social media bios, and your email signature. ARC readers are an underused channel — brief them on your reader magnet and ask them to mention it when they review. Social promotions and BookFunnel group promos can also drive subscriber spikes.
Your reader magnet is the engine that fills your launch list — the group of engaged subscribers who will buy on release day and generate the sales velocity that moves rankings.
Start building 3–6 months before your book launches. Run targeted reader magnet promotions (BookFunnel group promos, social ads to your reader magnet landing page, cross-promos with authors in your genre) to fill your list with readers who are genuinely interested in your genre.
When launch day arrives, your subscriber list has already been warmed through your welcome sequence. They know you. They trust you. They've enjoyed your free content. The ask to buy your book lands in an already-warm relationship, not as a cold pitch from a stranger. That difference — warm list vs. cold audience — is why email consistently outperforms every other channel for author launches.
iWrity helps authors plan, write, and deliver reader magnets that build real subscriber lists.
Start FreeFor fiction, 5,000–20,000 words is the sweet spot. Short enough to produce quickly, long enough to feel like genuine value. A 3,000-word story can work if it's tightly written and delivers a satisfying experience — but anything under 2,500 words risks feeling like a teaser rather than a gift. For non-fiction, length matters less than usefulness: a one-page checklist can outperform a 10-page guide if it solves a specific problem immediately. The measure isn't word count — it's whether the reader feels they got something real.
BookFunnel is the clear winner for fiction authors. It handles hosting, delivery, and device-specific instructions for getting EPUBs onto Kindles, Kobos, and phones — which removes a major friction point for readers. It integrates with every major email platform and provides delivery analytics. The cost (starting at $20/year) is trivial compared to what a healthy email list generates. For non-fiction authors delivering a PDF checklist or guide, your email platform's built-in file delivery is sufficient and saves the subscription fee.
Romance: an extended epilogue showing the couple 6 months later, or a bonus POV scene from the love interest's perspective. Thriller/mystery: a prequel story showing how the detective took their first case, or a 'case file' prop document from the world. Fantasy/sci-fi: a short story from a secondary character's perspective, a world-building lore document, or a prequel showing the villain's origin. Cozy mystery: a recipe collection from the protagonist's world (genuinely popular in this genre). Non-fiction business or productivity: a template, calculator, or one-page framework that saves the reader hours.
They can, but not automatically. The most effective approach is to include your reader magnet link in your ARC materials and brief your ARC team about it. Some authors include the reader magnet as a standalone page in their ARC file itself, separate from the novel. Others mention it in their ARC team onboarding email. ARC readers are ideal newsletter subscribers — they've already signalled investment in your work by agreeing to read and review. Converting them to your email list turns a one-book interaction into a long-term relationship.
If your reader magnet is driving steady signups and the content still reflects your current writing quality and world — leave it alone. Don't fix what isn't broken. If conversion rates have dropped, your writing style has evolved significantly, or the reader magnet no longer represents the books you're publishing now, a refresh makes sense. For fiction, the most common trigger for an update is releasing a new series — your old reader magnet may be pulling the wrong readers for your new direction. For non-fiction, update when the information becomes outdated.
