KDP Select gives you up to 5 free promotion days every 90-day term. Used strategically — with the right timing, promotion stacking, and follow-through plan — free days can seed reviews, spike organic rank, and drive series read-through far beyond what the download numbers suggest.
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KDP Select’s Free Book Promotion tool lets you make your enrolled ebook available for free for up to 5 days within each 90-day term. Free days generate no direct royalty income — you earn nothing per download during the promotion — but they serve several indirect strategic purposes that can deliver real value when the promotion is well-executed. Used carelessly, free days produce a spike of downloads with no lasting effect. Used strategically, they can meaningfully accelerate a book’s review count, series read-through, and organic visibility.
How Free Days Work
Setting up a Free Book Promotion is done through your KDP Select dashboard. Navigate to your enrolled title, find the KDP Select section, and click “Free Book Promotion.” You can schedule your free days up to 90 days in advance, choosing either consecutive days (e.g., a 3-day block) or individual days spread across the term. The promotion starts and ends at midnight Pacific Time on the dates you choose. During the promotion, your book displays a £0.00 / $0.00 price on Amazon and anyone can download it without charge.
You can run up to 5 free days per 90-day KDP Select term. These 5 days can be split across multiple promotions within the term or used in a single block. Many authors reserve their free days for a single well-promoted 2–3 day window rather than spreading them as individual days, since concentrated promotion generates more downloads from the same amount of marketing effort — promotional newsletters and social posts have more impact when they all point to the same live event simultaneously rather than to scattered individual days.
Downloads during a free promotion count toward your free list BSR but not your paid list BSR. Your paid BSR is unaffected during the promotion. When the promotion ends and your book returns to its paid price, you may see a temporary improvement in your paid BSR from renewed interest and a small carry-through of readers discovering the book during the free period and purchasing paid follow-up books.
The Strategic Case for Free Days
Free days are most valuable in three specific situations. The first is seeding early reviews for a new publication. A free day in the first month of a book’s life generates downloads from readers who might not have paid for an unknown debut — and those readers, if they enjoy the book, become early reviewers who establish the social proof that improves conversion for paid purchases afterward. Even if only 5–10% of free downloaders actually read and review the book, a 500-download free day can yield 25–50 reviews — a meaningful review foundation for a book that launched with zero.
The second situation is book one of a series. Making book one permanently or temporarily free is one of the most effective series-reader-acquisition strategies available. Readers who download book one for free, read it, enjoy it, and then pay full price for books two and three generate far more total revenue than what was “lost” on the free book one download. Many prolific series authors run free days on book one repeatedly throughout the series’ life precisely because each free download represents a potential full-price customer for the entire series tail.
The third situation is reigniting a dormant backlist title. A book that published 18 months ago, accumulated some reviews, and has settled into a low-sales steady state can benefit from an occasional free day that brings in a fresh wave of readers, some of whom review, and some of whom discover your other titles through your author page or also-bought recommendations. The free day reactivates the book’s visibility briefly and seeds the review and recommendation activity that sustains organic discovery between more active promotional periods.
Promotion Stacking: Making Free Days Count
A free day with no promotion beyond listing the book for free generates very few downloads. The free price alone does not make your book discoverable — Amazon’s free list has hundreds of thousands of titles and your book is not automatically surfaced to browsing readers just because it’s free. Meaningful free day results require active promotion to readers who are already looking for free books.
The most effective promotion channel for free days is genre-specific book promotion newsletters — services that email their subscriber lists daily with curated free and discounted book recommendations. Sites like Freebooksy, Robin Reads, Ereader News Today (ENT), and Book Barbarian each reach genre-segmented audiences of readers actively looking for free ebook picks. Submitting your free promotion dates to these services (typically 2–4 weeks in advance) means your book is featured to thousands of genre-matched readers on the same day it’s free, dramatically increasing download volume versus an unannounced free day.
Stack multiple promotion submissions across your free days where possible: submit to two or three newsletter services for the same promotional period, coordinate a social media post and email list announcement to go out the morning your free promotion begins, and if you have a BookBub author profile, post about the free promotion there as well. The cumulative effect of multiple promotional channels firing simultaneously — all driving readers to the same free book on the same day — generates peak download volumes that produce the strongest review seeding and BSR spike effects.
Setting Realistic Expectations
The impact of free days has moderated over the years as the free book market has become more crowded and as Amazon’s algorithm has reduced the paid BSR carryover effect from free downloads. The era of free days producing dramatic and lasting paid rank improvements is largely over. What free days reliably still deliver is: download volume proportional to how well the promotion is marketed, review seeding proportional to how engaging the book is, and series read-through proportional to how compelling book one is as a series entry point.
Don’t measure free day success purely by download count. Measure it by the downstream effects: how many reviews appeared in the weeks following the promotion, whether series book two saw a sales uptick after a free day on book one, and whether your paid BSR showed any improvement in the weeks following the promotion. These outcomes are the real indicators of whether your free days are generating strategic value.
A free promotion that generates 1,000 downloads but no reviews and no series carry-through is strategically inert — the book was downloaded and not read. A free promotion that generates 200 downloads, 15 new reviews, and 30 sales of book two is highly valuable, even though the raw download number was lower. The quality of your book — whether it engages readers enough to finish it and act on it — is the primary determinant of which scenario plays out. Professional manuscript proofreading ensures the book readers download for free is good enough to make them want to pay for what comes next.
Free Days vs Countdown Deals: Choosing the Right Tool
KDP Select offers two promotional tools — Free Days and Countdown Deals — and they are not interchangeable. Free Days maximise download volume and reader acquisition at the cost of all direct income during the promotion. Countdown Deals generate income during the promotion (at the 70% royalty rate, even at $0.99) while sacrificing some download volume compared to free. Countdown Deals also display the original price alongside the discounted price, creating visible savings messaging that free promotions don’t need (since $0.00 is already maximally compelling).
Use Free Days when the primary goal is reader acquisition and review seeding, and when direct income during the promotion is less important than volume. Use Countdown Deals when the primary goal is a sales spike that generates both income and improved BSR, and when you want the promotional price to display alongside the original price as a value signal. For series authors, Free Days on book one and Countdown Deals on subsequent books is a common and effective combination within the same KDP Select term. KDP Rank Fuel’s Countdown Deal Planner helps you schedule and track both promotional types across your catalogue.
Coordinating Free Days with External Promotion Services
To get the most from a free day, you need to be listed in front of readers who are actively looking for free ebooks in your genre — and that means submitting to book promotion services well in advance. Most genre-specific free book promotion newsletters have submission deadlines of 2–4 weeks before the promotion date. Plan your free days at least a month ahead so you have time to submit to multiple services before their deadlines close.
The most widely used free book promotion services as of 2026 include Freebooksy (large genre-segmented audience, strong for most fiction and nonfiction categories), Robin Reads (good conversion rates for literary fiction and narrative nonfiction), Ereader News Today (ENT — large audience, accepts free titles with fewer reviews than some other services), and Buck Books (good for lower-review-count free titles). Each service has its own submission requirements, including minimum review counts and average star ratings. Check current requirements before submitting — services periodically update their eligibility criteria.
Plan your free day submissions to spread across multiple services on overlapping dates for your promotional window. If your free period is three days, submit to one service for day one, another for day two, and a third for day three — or submit multiple services for the same day if they allow it. The goal is sustained promotional coverage across the full free window rather than a single-day spike. Authors who stack three or more newsletter features across a 3-day free window consistently outperform those who use a single service for a single day, even when the individual services have similar reach.
After the Free Days: Following Through
The value of free days is realised in the weeks after the promotion, not during it. Within 48 hours of your free period ending, send an email to your list thanking those who downloaded and asking for a review if they’ve had a chance to read it. Monitor your product page for new reviews over the following three to four weeks — this is your primary metric for whether the free days generated genuine reader engagement. Check your series book sales in the same period to assess read-through from free book one downloads.
If free days generate downloads but very few reviews or series carry-through, the issue is typically one of two things: either the readers downloading were not well-matched to your genre (suggesting your promotion services weren’t well-targeted), or the book itself isn’t compelling enough to sustain engagement after the opening pages. Use this data to refine your approach — target more specific genre-matched services next time, or assess whether the manuscript needs improvement before the next promotional push.
Plan Your Free Day Promotions with KDP Rank Fuel
KDP Rank Fuel’s Countdown Deal Planner tracks your KDP Select promotional windows and helps you schedule free days and Countdown Deals for maximum strategic impact across your catalogue.
