Free Resources
Tools we built for self-published authors — free to use, open to everyone, and no account required.
KDP Royalty Calculator
What a book actually pays you — ebook, paperback or hardcover — with the printing cost, the delivery fee and the price KDP will refuse. Every store at once.
Amazon's own published figures, dated.
ISBN Barcode Generator
The barcode for the back of a printed book, as a vector PDF or SVG — measured against KDP's own cover rules before you download it.
Free, no account, nothing uploaded.
QR Code Generator
Design a code for the back matter of your book — colours, dot shapes, a logo, a caption — and check it still scans before it goes to print.
No account, no watermark, never expires.
Kindle Unlimited page rates
What Amazon has paid per page read, month by month and store by store, going back to 2015. Amazon publishes the fund; the rate has to be derived.
Updated as each month settles.
KENP calculator
What Kindle Unlimited pays for pages read — your book's page count, the store you sell in, and the rate Amazon actually settled rather than a number copied off a blog.
Applies Amazon's 3,000-page per-reader ceiling.
Book sales calculator
What a Best Sellers Rank really implies in sales, for any Kindle or print store — as a range, because we joined real ranks to real KDP royalties and a single number would be false.
Runs in your browser. Nothing is sent anywhere.