Fixing a book that is already published
Authors treat publication as a door that locks behind them. It is not, and the reason is the printing model: with print on demand no copy exists until someone orders one, so there is no pallet of the wrong version sitting in a warehouse waiting to be written off.
That changes the arithmetic on every small flaw you find afterward.
What replacing a file actually does
You upload a corrected interior PDF to the same book listing. The store runs its checks, the new file replaces the old one, and the next copy printed is the corrected copy. The cover is replaced the same way, and both usually go through a short review before they go live.
Copies already sold stay as they are. You are not recalling anything, and you are not issuing an apology. You are changing which file the printer pulls from tomorrow.
The cost is your time and a short interruption to availability while the book is under review. That is the whole bill, which is why the instinct to leave a typo alone because "it's published now" is backwards.
Which flaws are worth fixing
A typo found in week two is worth fixing, and so is a broken back-matter link, a chapter heading set in the wrong style, or a copyright page missing a line you meant to include. None of these are worth a panic; all of them are worth a correction round.
What is not worth it is re-uploading the same day you find each one.
The page-count trap
This is the mistake that turns a small correction into a bad print.
If a correction changes the number of pages — adding a paragraph that pushes the last chapter over, deleting a page of front matter, switching the paper you print on — then the spine width changes. The cover is built around that spine. A new interior with the old cover is a wrap of the wrong total width, with the folds landing inside the front and back panels.
Sometimes the store's checks catch the mismatch and refuse the interior, which is the good outcome. Sometimes the difference is small enough to pass, and you find out when the proof arrives with the title creeping around the spine.
So the rule is simple: if the page count changed, rebuild the cover from the new count and upload both files together. Check the final number after the correction, not the number you remember.
In the tools. The final page count from the Interior Formatter flows straight into the Cover Maker, which recomputes the spine for your paper color and printer — so a correction that moves the page count produces a matching cover instead of a mismatched one. Start a book → · about the tools
What does not need a new ISBN
An ISBN identifies an edition of a book, not a file. Correcting the book is not making a new one.
- Typo and grammar fixes. Same book, same ISBN.
- Formatting corrections. Margins, running heads, a chapter that started on the wrong page — same ISBN.
- A cover refresh. New art, new typography, same text inside — same ISBN. The retailer will want the new image, and it may take a while to propagate.
What does need a new ISBN is a new edition: substantially revised or expanded content, a second edition with new chapters, a different translation, or a change of format such as paperback to hardcover, which needs its own ISBN regardless. The line between a correction and a revision is a judgment call, and the honest test is whether a reader who owns the old one would feel they are missing something. Do you need your own ISBN? →
Batch the corrections
Every re-upload costs a review period and another chance to upload the wrong file. Doing it once per typo is how people end up with five versions in circulation and no idea which is current.
Keep a running list instead. A note file, a marked-up proof copy, whatever you will actually use — with the page number and what is wrong. When the list is worth acting on, or when something serious appears, fix them all in one pass and upload once.
Re-proof if the change was significant. A handful of word-level fixes that did not move the page count do not need a new physical proof. Anything that changed the pagination, the cover, or a whole section does. Order the proof. Then read it in daylight →
If you are tracking versions, note the printing on the copyright page — a printing line, or an edition statement for a genuine new edition. It costs one line and tells you later which copy someone is holding. What belongs on a copyright page →
Ebooks are a separate job
Fixing the print book does not fix the ebook. They are two files and two listings, and a correction made in one will sit unmade in the other until you do it.
A corrected EPUB can usually be re-uploaded the same way, and it has no page count to worry about, because the text reflows. What varies is what happens to people who already bought it. Some stores can push an update to existing readers, some do it only for changes they consider significant, and some leave the old file on the device untouched. The rules differ by store and they change. Check what your store does rather than assuming your readers will get the fix.
If you are correcting both, correct them from the same source manuscript in the same sitting. Two files diverging quietly over a year of small fixes is worse than either original flaw.
Make yours
Everything here is built into the tools, and they are free to use: name your book, bring your manuscript or your artwork, and work as long as you like. You only pay when you want the files without the preview watermark.
Next: The proof came back wrong. Now what? · More: The printer's template, and how to read it · How to calculate spine width · When to redo a cover, and when to leave it alone