EPUB FixerKDP upload error scanner

EPUB error guide

More than one title in OPF metadata (E20006)

Use this when EPUBCheck finds more than one book title inside the EPUB package. Compare the title values before removing anything; changing the KDP listing does not change content.opf.

Scan EPUB structureSee an example report

Compare first

List every title in content.opf.

Check each dc:title value and any title, subtitle, series, or edition details before deciding that one entry is a duplicate.

Review the source

Choose the publication title manually.

Even an entry such as Untitled can carry source-tool refinements or references. Confirm the intended title in the source project before removing or changing dc:title.

Leave choices to you

The tool should not choose your book title.

If two values could be intentional, return to the source project or review the publication metadata before editing the EPUB.

Scan when the message does not name the affected path. The report shows affected paths and repair decisions, not manuscript text.

No signup before the scan report.Checks EPUB package paths, not manuscript text.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

  • More than one title defined in OPF metadata
  • E20006 more than one title in OPF metadata
  • Duplicate dc:title metadata
  • OPF title metadata conflict

Use this guide when

Your message matches "More than one title defined in OPF metadata" or one of the report titles above.

Upload if

You have the exported reflowable .epub and need the affected path, file, field, or repair decision before editing.

Handle outside this tool

Use the source tool or publishing workflow for DOCX, PDF, KPF, KCB, fixed-layout, comics, image-first books, DRM, visual design, or KDP listing and approval problems.

Read the scan report

Decide if this report item matches.

Use the report label, affected file, and repair decision together. A matching title alone is not enough if the file path or EPUB structure points to a different problem.

Error textAffected pathDecisionRepair, review, or stop

A useful report does not stop at the error name. It connects the message to an internal file and a next action.

Match the report title.

Look for "More than one title defined in OPF metadata" or the closest title above. Keep the original EPUBCheck, KDP, or Kindle Previewer wording if it differs.

Check the affected file first.

Use the Affected area, Source file, Target file, or Problem type rows before editing OPF, nav, XHTML, CSS, or image paths.

Follow the repair decision.

Repairable means one clear structural change. Needs review or Not supported means use the named file, source project, or platform step.

Keep with your repair note.

Copy these fields from the report instead of rebuilding the fix from memory.

Source file
Target path or field
Original error
Repair decision
Next step

1. Example report output

What a duplicate title report should show.

The report should show the competing metadata values, not just say the title is wrong.

Validator message

E20006: There is more than one title defined in OPF metadata.

Affected file

OEBPS/content.opf.

EPUB Fixer report

dc:title appears twice: Final Book Title and Untitled Export.

Do this next

Confirm the intended title and refinements in the source project, then edit the OPF manually.

Do not do this

Do not let the scanner choose between real title variants or subtitle wording.

The scanner reports the conflicting values but does not remove or rewrite title metadata automatically.

2. Next step

Decide whether the intended title is clear.

Metadata can be easy to edit but risky when values conflict.

Scan first

List every dc:title.

Show each title value, id, and refinement before editing content.opf.

Manual edit

Confirm the intended title in the source project.

Check title ids and refinements, then remove or align entries in the source workflow or EPUB editor.

Manual review

The title choice is editorial.

Return to the source project when title, subtitle, series, or edition wording needs a decision.

3. Concrete path example

A typical duplicate title export.

A source tool can leave an old title next to the real publication title.

Validator:
E20006: There is more than one title defined in OPF metadata.

Report:
dc:title #1: Final Book Title
dc:title #2: Untitled Export
Source file: OEBPS/content.opf
Fix decision: manual — confirm the intended title and refinements
Next: edit the source project or OPF, then validate again

If both titles could be intentional, choose the publication metadata manually.

Quick decision

Do not let an automatic repair choose your book title.

The scanner can point to conflicting metadata, but the publication title is an author or publisher decision.

Scan first

Show every title value.

List duplicate dc:title entries and any title refinements in content.opf.

Manual edit

The author or publisher confirms the intended value.

Use the source project or EPUB editor to remove or align title entries after checking ids and refinements.

Stop

The metadata needs a publishing decision.

Do not choose between title, subtitle, series, or edition values automatically.

Start here

Check the OPF title entries before changing store metadata.

This is an EPUB package metadata problem. KDP listing title fields do not fix duplicate title entries inside content.opf.

Matched

What it means

The EPUB package names the book title more than once, so validators cannot treat the metadata as a single clear title.

Matched

Can it be fixed automatically?

The scan can list every dc:title value, id, and refinement, but it does not automatically delete or choose title metadata.

Matched

What to check next

Open content.opf and list every dc:title entry.

Matched

What not to assume

It is unsafe when the title, subtitle, series, or edition wording needs author or publisher judgment.

Common situations

Common duplicate title cases.

Duplicate title metadata often comes from repeated export or manual OPF editing.

An old draft title remains.

The OPF contains a final title and a stale draft title.

Confirm the intended publication title and any refinements in the source project before editing manually.

Subtitle was exported as another title.

Some tools split title and subtitle in a confusing way.

Review metadata manually before deleting.

Series or edition data is mixed into title.

Extra title-like fields may represent real publishing metadata.

Keep structure valid without guessing the cataloging choice.

KDP title differs from OPF title.

Store metadata and EPUB package metadata are separate.

Fix OPF only when the EPUB package itself has duplicate title entries.

Duplicate OPF title error text

E20006: There is more than one title defined in OPF metadata.

Where OPF title metadata conflicts appear

EPUBCheck, Kindle Previewer, or a store validator finds more than one title value in the OPF metadata package.

What it means

The package metadata contains competing title values.

The EPUB package names the book title more than once, so validators cannot treat the metadata as a single clear title.

Repeated exports, source-tool metadata fields, or manual OPF edits can leave duplicate dc:title entries.

Before you edit

Compare dc:title entries and their ids.

A manual fix needs the author or publisher to confirm the publication title, ids, and refinements. Do not delete metadata from the report alone.

  1. 1Open content.opf and list every dc:title entry.
  2. 2Check whether title refinements, subtitles, or series metadata are involved.
  3. 3Compare the OPF title with the source project title if needed.
  4. 4Identify stale export values such as Untitled, Draft, or old names.
  5. 5Stop if the title choice affects publication metadata.

Why KDP checks it

Why validators check OPF metadata title values.

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.

EPUBCheck

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

KDP eBook file formats

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

Can this be fixed safely?

Why duplicate title metadata remains manual.

When automatic repair is safe

The scan can list every dc:title value, id, and refinement, but it does not automatically delete or choose title metadata.

When you need manual review

It is unsafe when the title, subtitle, series, or edition wording needs author or publisher judgment.

Before / after example

Before: content.opf has two dc:title entries. Next: confirm the intended publication title, subtitle, series, edition, ids, and refinements; edit manually and validate again.

Ready to retry?

Scan OPF metadata before editing the title.

Upload the EPUB that failed. The report should show every dc:title entry, id, and title refinement so the author or publisher can choose the intended metadata manually.

Upload EPUB to scan

FAQ

Questions authors ask about duplicate OPF titles.

Can EPUB Fixer remove duplicate OPF title metadata?

No. It can list the conflicting dc:title values, ids, and refinements, but an author or publisher must choose the intended metadata and edit it in the source project or EPUB editor.

Does changing my KDP listing fix duplicate OPF titles?

No. This error is inside the EPUB package file, usually content.opf.

Is a subtitle the same as a duplicate title?

Not necessarily. Subtitle and title refinements can be legitimate metadata, so review them before deleting entries.

Why does duplicate title metadata matter?

Publishing validators need one coherent package title so the EPUB metadata is not contradictory.

Related EPUB error guides