Do not reuse an ISBN for a genuinely new eBook edition. Do keep the existing ISBN for ordinary corrections that leave the publication product and edition unchanged. The hard part is deciding which side of that line the update occupies.
An ISBN identifies one publication from one publisher in a defined product form and edition. It does not identify every future version of the manuscript, and it does not have to change for every corrected file. The International ISBN Agency’s manual says a separate ISBN is assigned when significant changes create a new edition; its FAQ confirms that an ISBN cannot be reassigned and that a new title requires a new ISBN.
Use a documented product test: would a reader, retailer, library, or distributor reasonably need to distinguish the revised eBook from the edition already bought, reviewed, licensed, or cataloged? If yes, create a new edition and identifier. If no, update the existing product through the controlling platform or distributor.
|
Revision |
Keep ISBN? | New ISBN? | Why | Action |
Confirm |
| Typos/punctuation | Yes | No | Same edition | Replace file | Platform |
| Broken links | Yes | No | Technical correction | Fix and QA | Platform |
| Accessibility remediation | Usually | Maybe | Same product unless separately sold | Document scope | Agency if separate |
| Price/description | Yes | No | Commercial metadata | Update fields | Distributor |
| New chapter | Maybe no | Likely | Substantial content | Edition review | Agency |
| Major rewrite | No | Yes | New edition | New listing | Agency |
| New title | No | Yes | Identity change | New edition | Agency |
| Translation | No | Yes | New language | New product | Agency |
| New publisher | No | Yes | Registrant change | Publisher edition | Agency |
| Platform move | Usually | Maybe | Same product if own ISBN | Map feeds | Provider terms |
| Print conversion | No | Yes | Different form | Separate product | Platform |
Would a reader who purchased the earlier edition feel they received a materially different book? Adding chapters, replacing the argument, changing recipes or technical instructions, or revising a reference work for a new period can cross the line. Fixing typos and broken links usually does not.
Does the title, language, edition statement, publisher, or marketed product form change? Those are core identity signals. A real title change, translation, declared second edition, or new publisher edition ordinarily requires a new ISBN.
Will both versions remain available, or must a buyer select one? If the old and revised products coexist, each needs a distinct identity. If an error-corrected file simply replaces the same edition everywhere, keeping the identifier is usually appropriate.
A platform may allow a file update but lock the ISBN, title, or edition fields. Technical ability is not the same as bibliographic correctness. Check the national ISBN agency and the services that distribute the product.
|
Test |
Question | Keep signal | New-edition signal | Evidence | Owner |
Escalate |
| Reader | Would buyer notice? | Corrections | New value/promise | Change log | Editor | Ambiguous impact |
| Identity | Core fields same? | Same title/language/publisher | Changed identity | Metadata master | Publisher | Core change |
| Coexistence | Both versions live? | Old replaced | Both marketed | Channel map | Operations | Parallel sale |
| Structure | Content reorganized? | No material change | Chapters/learning path change | Diff report | Editor | Major restructure |
| Marketing | How promoted? | Same edition | Revised/second edition | Launch copy | Marketing | New promise |
| Functionality | Product form same? | Technical remediation | Distinct fixed/reflowable product | Specs | Production | Separate supply |
| Platform | Fields editable? | File replace | New project required | Help policy | Operations | Locked field |
| Agency | Standard decision? | Clear correction | Significant change | Written guidance | Publisher | Always if uncertain |
Minor changes preserve the same edition. Common examples include correcting spelling, punctuation, isolated factual errors, broken hyperlinks, image alt text, table-of-contents links, CSS bugs, navigation, accessibility labels, or small layout defects. A refreshed description or price is metadata maintenance, not a new edition by itself.
There is no reliable universal percentage rule. “Less than 10%” or “more than 30%” shortcuts are not official ISBN standards. A short book can change materially with one new chapter; a long reference work can correct hundreds of small errors without becoming a new edition. Judge the nature and market impact of the change.
A new edition is likely when the publisher adds or removes chapters, reorganizes the work, rewrites a significant portion, updates a time-sensitive handbook for a new year, replaces the central argument, changes learning outcomes, or explicitly labels the product Revised Edition or Second Edition.
A new foreword or appendix is not automatically decisive in isolation. Consider its length, function, promotion, edition statement, and customer expectation. When a prominent new feature is part of the sales promise, treating the release as a new edition is usually cleaner.
|
Change type |
Examples | Edition impact | ISBN | Metadata |
Files |
| Correction | Typos, punctuation | None | Keep | Optional update | Replace |
| Technical fix | Links, CSS, TOC | None | Keep | Accessibility note | Replace |
| Minor factual update | Small correction | Usually none | Keep | Change log | Replace |
| New foreword | Short/context only | Case-dependent | Ask | May add credit | Replace/new |
| New chapters | Expanded work | Likely new edition | New | New edition | New file |
| Major rewrite | Core content | New edition | New | Complete new record | New file |
| New title | Identity | New product | New | New title | New cover/file |
| Translation | Language edition | New product | New | New language | Translated |
| Publisher transfer | New publisher edition | New product | New | New imprint | New release |
The original article overstates the rule by saying every conversion among EPUB, Kindle format, PDF, and MOBI always requires a new ISBN. ISBN assignment for digital publications depends on whether distinguishable eBook product forms are separately available and on the rules of the supply chain.
A publisher selling a reflowable EPUB and a fixed-layout PDF as separate products with different functionality should normally distinguish them. A distributor generating proprietary delivery files from one publisher-supplied EPUB may treat them as one eBook product. MOBI is no longer the standard production target for modern KDP workflows; KDP accepts EPUB and converts it for Kindle delivery.
Do not assign ISBNs to every internal export. Assign them to the publication products offered to the market. The International ISBN Agency’s eBook guidelines should control ambiguous cases.
|
Market product |
Separate ISBN? | Example | Why | Platform ID option | Same content? |
Decision |
| Reflowable EPUB | One if used | Standard eBook | Trade product | ASIN/GGKEY/Kobo ID | Baseline | Publisher choice |
| Fixed-layout eBook | Often separate | Children’s picture book | Different functionality | Platform-specific | May match text | Agency/distributor |
| PDF sold separately | Often separate | Printable manual | Distinct delivery/use | Store ID | May match | Agency/distributor |
| Kindle delivery file | Not automatically | KDP conversion | Derived by platform | ASIN | Same | One eBook product |
| Internal QA export | No | Test EPUB | Not marketed | None | Same | No assignment |
| Paperback | Yes from eBook | Print book | Different form | Print ISBN | Same text | Separate |
| Audiobook | Yes if ISBN used | Narrated edition | Audio product | Distributor ID | Same words | Separate |
| Translation | Yes | Spanish EPUB | Language product | Platform ID optional | Translated | Separate |
Not automatically. If the same publisher moves or adds the same eBook edition to another distributor, a publisher-owned ISBN can continue to identify that product where the new channel accepts it. Keep title, edition, language, publisher, and content identity consistent, and prevent duplicate feeds.
A platform-provided identifier may be restricted. KDP does not require an ISBN for Kindle eBooks and assigns an ASIN. A free or aggregator-provided ISBN may be controlled by that provider. Moving away can require a new identifier or new edition record because of the provider arrangement—not merely because a dashboard changed.
Usually yes for the new publisher’s edition. The registrant element identifies the publisher. A rights acquisition, imprint transfer, or service move must be distinguished from fixing a misspelled publisher name. The former changes publishing responsibility; the latter may be a correctable data error.
KDP allows authors to upload revised manuscript and cover files for a live title, subject to review. Its update guidance distinguishes small corrections from significant changes that should be published as a new edition. Kindle eBooks do not require ISBNs, and the ASIN remains Amazon’s platform identifier.
Do not keep an old edition identifier solely to preserve reviews or sales rank when the product has materially changed. Retail history is a commercial concern; correct edition identification protects buyers and the catalog. Ask KDP Support about relationship linking or corrections rather than altering identity fields improperly.
|
Scenario |
Change | Decision | Identifier | Platform step |
Proof |
| Link cleanup | 40 links/20 typos | Same edition | Keep | Replace file | QA report |
| Annual guide | 2027 rules/title | New edition | New | New listing | Edition statement |
| EPUB remediation | EPUB 2 to accessible EPUB 3 | Usually same | Keep/ask | Replace file | Accessibility QA |
| Spanish edition | Translation | New product | New | New listing | Language record |
| New aggregator | Same wide eBook | Same edition | Keep own ISBN | Remove overlap | Feed map |
| Provider ISBN move | Provider restricted | New route | New/provider ID | Rebuild | Terms |
| New foreword | Prominent new sales feature | Case-dependent | Ask | Edition review | Change log |
| Major novel rewrite | Substantial plot changes | New edition | New | New listing | Reader test |
The text, title, edition promise, and learning content remain the same. Keep the ISBN, replace the eBook file, update the change log, and verify every link after publication.
Rules, examples, thresholds, dates, and advice change, and the title becomes 2027 Edition. Assign a new ISBN if the eBook uses one, preserve the 2026 record, and publish a distinct edition.
If the content and marketed product remain the same and the update improves navigation, semantics, alt text, and compatibility, the ISBN may remain. If the publisher sells an accessible edition as a separately orderable product with distinct functionality, ask the agency and distributor whether a separate ISBN is required.
The translation is a new language publication. Give it a distinct ISBN when using ISBNs and create new language metadata, cover, description, rights, and retailer records.
A publisher-owned ISBN may remain if it is the same edition and the new aggregator accepts it. Remove overlapping retailer feeds, confirm delisting, and verify that the new metadata does not create duplicates. A provider-owned ISBN follows its provider terms.
Ignore the percentage as the decision rule. Compare plot, characters, structure, title, edition statement, and reader expectation. If the rewrite is marketed as a revised edition or materially changes the work, assign a new ISBN.
|
Finding |
Immediate action | Keep/new ISBN | System change | Verification |
Do not |
| Minor error under old ISBN | Log and correct | Keep | Replace file | Live sample | Create duplicate |
| New edition under old ISBN | Stop rollout | New | Create edition record | IDs/listings | Overwrite old metadata |
| Wrong platform ID used | Map origin | Provider decision | Rebuild route | Accepted listing | Assume portability |
| Duplicate feeds | Pause one route | Usually keep | Remove overlap | One canonical listing | Change ISBN first |
| Translation shared ISBN | Separate product | New | New language record | Retail pages | Relabel old |
| Publisher changed | Review rights | Usually new | New publisher record | Agency data | Edit cosmetically |
| Old edition overwritten | Restore history | New for new edition | Correct records | Both editions | Delete history |
| Ambiguous change | Freeze release | Ask agency | Document decision | Written response | Guess percentage |
No. The ISBN remains permanently associated with that publication and cannot be reassigned.
Normally no. Keep the same edition and update the file.
Often yes because it can create a substantially revised edition. Evaluate reader expectation, marketing, and edition statement, and confirm ambiguous cases.
A routine cover refresh does not automatically require one. A change tied to a materially new product or edition may.
No. Update the commercial metadata.
Only when the agency and supply chain treat them as the same eBook product. If separately available with materially different functionality, assign distinct ISBNs. Ask the agency rather than relying on file extensions alone.
No. KDP assigns an ASIN to Kindle eBooks. A publisher may still use an eBook ISBN for broader catalog strategy.
A publisher-owned ISBN can usually remain with the same product where accepted. Provider-assigned numbers may be restricted. Prevent duplicate feeds.
The new publisher normally assigns a new ISBN to its edition. A spelling correction to the existing publisher name is a different case.
Manage availability deliberately. Preserve the bibliographic record and existing customer access, follow platform rules, and distinguish the new edition. Do not delete history merely to simplify the dashboard.
A revised eBook keeps its ISBN when the publisher is correcting the same edition. It receives a new ISBN when the revision creates a product that readers and the supply chain must distinguish.
Document the changes, test identity rather than percentages, separate platform mechanics from ISBN rules, and preserve the history of every edition. That is the reliable way to update an eBook without confusing readers, retailers, libraries, or reporting.
