EPUB FixerKDP upload error scanner

EPUB error guide

Fix EPUB for Kindle Upload and Previewer Errors

Upload the EPUB that Kindle Previewer or KDP rejected. The report finds the affected path and offers a checked repair when one safe EPUB structure fix passes EPUBCheck again.

Sending a personal document? Check Send to Kindle delivery errors.

Scan EPUB structureSee an example report

You see

Kindle or KDP rejected the EPUB.

Upload the same reflowable .epub when Kindle Previewer or KDP reports a validation, conversion, TOC, link, metadata, or package problem.

You get

A Kindle EPUB fix decision.

The report names the affected path and separates a checked structural repair from manual review or a Kindle workflow issue.

Not covered

Device conversion or KDP setup.

Send to Kindle conversion, KPF/KCB creation, account, listing, pricing, DRM, and final acceptance stay outside this EPUB structure scan.

Scan the EPUB to check file paths and see what can be repaired or needs manual review. Your original EPUB stays unchanged.

No signup before the scan report.Your original file is not overwritten.Repair download only after EPUBCheck passes again.

Need fixed-layout, DRM, or source-file help? Check unsupported or review-first EPUB cases.

Match these report titles

  • Fix EPUB for Kindle upload
  • Fix EPUB for Kindle Previewer
  • Kindle EPUB fixer
  • EPUB check before Kindle upload
  • EPUB check before KDP upload
  • Kindle upload EPUB structure check
  • Check EPUB before Kindle Previewer
  • Kindle Previewer preflight EPUB check
  • EPUB TOC, OPF, NCX, link, cover, manifest, or ZIP issue before upload

Start here

Fix supported EPUB problems before Kindle upload.

Upload the same EPUB that Kindle Previewer or KDP will inspect. The report shows whether the error is a clear package problem that can be checked after repair or a source and platform workflow issue.

Matched

What it means

A Kindle upload uses the finished EPUB package. The visible book can look fine while OPF metadata, navigation, links, resources, cover wiring, or ZIP packaging still disagree.

Matched

Can it be fixed automatically?

A checked repair is possible when one package correction is clear and can be validated again, such as OPF manifest, navigation declaration, media type, cover-image property, path, anchor, or ZIP wrapper alignment.

Matched

What to check next

Use the same .epub file you would send to Kindle Previewer or KDP.

Matched

What not to assume

It cannot fix Send to Kindle service or account errors, guarantee device import, create KPF files, choose DRM, approve listing metadata, fix pricing, judge content policy, redesign the book, or decide whether Kindle accepts the upload.

1. Example report output

What a Kindle EPUB fix report should show.

A useful report should map the Kindle message to one EPUB package area and one next action.

Kindle-facing file

The final .epub manuscript file, not the DOCX, PDF, KPF, or KCB source.

Navigation layer

nav.xhtml, toc.ncx, OPF manifest, and spine wiring for Kindle table of contents behavior.

Reference layer

Chapter XHTML, CSS, images, anchors, and internal links that Kindle Previewer may validate strictly.

Package layer

content.opf, manifest entries, media types, cover-image property, container.xml, and ZIP wrapper.

Decision

Retry-ready, checked repair, manual review, or outside EPUB Fixer scope.

The report should tell you where to look before you open Kindle Previewer again.

2. Next step

Choose a Kindle EPUB fix or another workflow.

The scan result should decide whether you retry, repair, or return to the source export.

Retry upload

The scan does not find a supported blocker.

Use Kindle Previewer and KDP's upload screen as the final checks for the platform workflow.

Repair package

The report finds one clear wiring problem.

Use checked repair when OPF, manifest, media type, navigation, cover property, path, or ZIP wrapper data can be aligned safely.

Fix source

The issue needs author or formatter judgment.

Use the source tool when the report points to missing content, no reliable TOC, ambiguous anchors, or layout-sensitive fixes.

3. Concrete path example

A Kindle upload check can expose an NCX or nav mismatch.

Kindle tools can care about navigation files even when the chapters open.

Before Kindle upload:
Previewer target file: final.epub

Report:
Navigation file: OEBPS/nav.xhtml
Legacy NCX: OEBPS/toc.ncx
OPF spine toc: points to old-toc
Decision: manual review if nav and NCX disagree; checked repair only when one intended navigation target is clear

Do not delete nav.xhtml or toc.ncx just because one looks older. Check how the OPF manifest and spine connect them first.

Quick decision

Is this a Kindle EPUB problem we can fix?

This path is for a finished EPUB manuscript. Kindle device import, Send to Kindle conversion, KDP account, listing, DRM, pricing, review, and approval tasks stay outside it.

Good fit

The Kindle manuscript file is a reflowable EPUB.

The scanner can inspect the package parts that Kindle Previewer and EPUBCheck usually complain about.

Manual fit

The scan names a path but the fix affects reading order.

Use the report as a checklist, then decide the final TOC, spine, anchor, or missing-content fix in the source workflow.

Not this tool

The problem is not inside the EPUB package.

KDP account setup, listing metadata, cover upload, pricing, DRM, review status, and content policy need the Kindle or KDP workflow.

Common situations

Common Kindle EPUB fix situations.

Start with the exact Kindle or KDP message and the EPUB file it names.

Matched

You want to fix a Kindle upload error without another blind export.

A targeted repair may be safer when the exported EPUB has one clear package blocker.

Scan the EPUB first and use the affected path as your Previewer checklist.

Matched

You are worried about the Kindle table of contents.

TOC failures often involve nav.xhtml, toc.ncx, OPF manifest, and spine wiring rather than visible chapter headings alone.

Check navigation wiring before rebuilding the book.

Matched

You want the internal EPUB cover to be recognized.

The Kindle manuscript cover depends on OPF cover metadata, manifest item, cover-image property, and the packaged image file.

Scan cover wiring; handle KDP marketing cover upload separately.

Kindle EPUB errors to check

Fix EPUB for Kindle or KDP upload: scan OPF, nav.xhtml, toc.ncx, links, anchors, cover wiring, manifest, media type, container.xml, and ZIP package structure before retrying.

Where Kindle EPUB problems usually appear

An author, formatter, or small publisher wants to fix a Kindle or KDP upload error in the exported EPUB before retrying Kindle Previewer or KDP.

What it means

Kindle can reject package wiring even when the chapters open.

Common causes include disconnected nav.xhtml or toc.ncx, stale OPF spine references, missing resources, missing anchors, wrong media types, cover metadata mismatches, missing manifest entries, container.xml path mistakes, and bad ZIP packaging.

Before you edit

Find the EPUB path before exporting again.

When the EPUB is already exported, the fastest useful check is usually OPF, nav.xhtml, toc.ncx, links, anchors, images, manifest entries, cover wiring, and ZIP packaging.

  1. 1Use the same .epub file you would send to Kindle Previewer or KDP.
  2. 2If you already have a Previewer message, paste that line after selecting the file.
  3. 3Check the report for OPF, nav.xhtml, toc.ncx, XHTML, CSS, image, anchor, manifest, cover, media-type, container, or ZIP findings.
  4. 4Use checked repair only when the report shows one clear package change and EPUBCheck passes again.
  5. 5Use the source tool when the report depends on reading order, missing assets, visual layout, or author intent.
  6. 6Handle Kindle or KDP account, listing, pricing, DRM, review, and approval issues outside this scan.

Why Kindle tools check it

Why Kindle upload tools inspect EPUB package files.

KDP eBook file formats

KDP supports EPUB files that meet Kindle Publishing Guidelines and recommends checking the file with Kindle Previewer before upload.

EPUBCheck

EPUBCheck checks EPUB 2 and EPUB 3 files against the official rules and reports package, markup, link, and file-reference problems.

EPUB 3.3 package rules

The OPF file is the EPUB's map: metadata, file list, reading order, and navigation wiring. KDP and EPUBCheck use it to decide whether the book package is coherent.

Repair example

When a Kindle EPUB error can be fixed here.

Before / after example

Before: the OPF spine points to an old NCX id or the manifest misses the navigation property. After: align the wiring only when the intended navigation file is clear and EPUBCheck passes again.

Ready to retry?

Find and fix the EPUB problem behind the Kindle error.

Upload the file you would send through Kindle Previewer or KDP. The report tells you whether a supported structural repair is possible and checks the repaired EPUB again before download.

Upload EPUB to scan

FAQ

Questions authors ask when Kindle rejects an EPUB.

Can you fix an EPUB for Kindle?

Sometimes. If Kindle or KDP is rejecting a supported EPUB structure problem, the report can offer a checked repair after the repaired file passes EPUBCheck again. Device import, Send to Kindle conversion, KPF/KCB, layout, account, and listing problems need another workflow.

What should I check before Kindle upload?

Check the final EPUB package: OPF metadata, manifest, spine, nav.xhtml, toc.ncx, links, anchors, images, cover wiring, container.xml, and ZIP packaging. EPUB Fixer reports affected paths and a next-step decision.

Is Kindle upload the same as KDP upload?

For this page, Kindle upload means the EPUB manuscript file going through Kindle Previewer or KDP. Account, listing, pricing, and review workflow are separate from the EPUB structure check.

Can this fix Kindle Previewer conversion failed?

Only when Previewer fails because of a supported EPUB structure issue. KPF creation, visual layout, complex conversion, fixed-layout books, and source formatting still belong in the Kindle or source workflow.

Can I use this with KPF or Kindle Create project files?

No. Upload a real .epub file here. KPF, KCB, DOCX, PDF, and source projects are outside this scanner.

Related EPUB error guides