Amazon KDP Manuscript Upload Errors: A Practical Fix Guide

Published July 30, 2026 · 10 min read

A KDP upload error usually belongs to one of three layers: the file cannot be processed, the print geometry does not match your setup, or the converted book contains quality problems. Diagnose those layers in that order. Otherwise, you can spend an hour changing margins when the real problem is an encrypted or damaged PDF.

This guide is based on Amazon's current manuscript file guidance, print formatting error reference, paperback submission guidelines, and eBook manuscript guide, reviewed July 30, 2026. Requirements can change, so treat the error shown in your KDP account as the final instruction for that upload.

First identify where the failure happens

Keep print and eBook diagnoses separate. A paperback is a fixed-layout manufactured object. A typical Kindle novel is reflowable: the reader can change font size, margins, orientation, and device. Reusing a print PDF as the eBook source often carries page headers, footers, and hard page geometry into a format that needs flexible structure.

1. Fix upload and conversion failures

Before changing the manuscript's design, make a clean export with a simple filename such as novel-interior-v3.pdf. KDP lists locked or encrypted files, unsupported filename characters, unembedded content, transparent layers, printer marks, comments, annotations, placeholder material, and PDF-creation watermarks among common failure points.

If the clean export still fails, create a short test PDF from the first ten pages using the same settings. A successful test points to a later page or object; a failed test points to the export configuration or shared styles. Divide a diagnostic copy into smaller page ranges to locate a corrupt image, font, or object, then repair the master manuscript.

2. Match trim size and bleed before moving content

A margin alert can be a page-size problem in disguise. Confirm the trim size selected in KDP, the manuscript's page size, and the bleed setting as one system. For a no-bleed interior, the exported page size should match the selected trim size. For a full-bleed paperback, KDP requires a PDF and adds 0.125 inches to the outer width plus 0.125 inches at both the top and bottom.

For example, a 6 × 9-inch paperback with bleed needs an interior page size of 6.125 × 9.25 inches. Bleeding artwork must extend to the outside page edge, while live text stays inside the safe margins. Do not add bleed to the gutter edge.

Use the detailed KDP trim size and margin guide to calculate the correct setup. If the trim choice changes after the book is formatted, rebuild the layout from the source rather than relying on Previewer's automatic scaling.

3. Fix margin and gutter errors at their source

Print Previewer checks the file's structure, not just what is visually obvious. A text box may cross a boundary even when its letters appear inside it. Italic glyphs can extend beyond a box. A hidden character, footer, page number, or blank object can also trigger an alert.

1. Open the first affected page in Previewer and note the highlighted boundary.
2. Return to the original Word, Affinity Publisher, InDesign, or other layout file.
3. Show formatting marks and object boundaries.
4. Move or resize the entire frame, not only the visible text.
5. Check the same master page, header, footer, or style everywhere it is used.
6. Export a fresh PDF and upload it; do not patch the uploaded PDF page by page.

The gutter generally grows with page count because a thicker book needs more room near the binding. Verify the current minimum for your page-count band rather than copying the gutter from a shorter book.

4. Fix low-resolution images without making the file enormous

KDP's print guidance calls for images of at least 300 DPI. Effective resolution depends on both pixel dimensions and the placed size. A 1200-pixel-wide image placed at 4 inches is 300 DPI; stretching it to 8 inches drops it to 150 DPI.

• Replace the source image with a genuinely higher-resolution version when possible.
• Reduce its placed dimensions if a smaller reproduction still serves the reader.
• Do not assume exporting at 300 DPI creates missing detail; it cannot restore pixels that were never present.
• Avoid extreme resolution. KDP notes that excessively high-resolution images can contribute to processing timeouts or manufacturing delays.

After replacement, inspect maps, charts, screenshots, captions, and grayscale images at normal reading size. Technical compliance does not guarantee legibility.

5. Resolve font errors and missing characters

Embed all fonts in both the interior and cover PDFs. If Previewer still identifies an unembedded font, the font may prohibit embedding or the export preset may be subsetting it incorrectly. Replace it with a licensed embeddable font, then export again with full embedding enabled.

Search the preview for accented letters, em dashes, curly quotation marks, mathematical symbols, ornamental scene breaks, and non-Latin scripts. A substituted font can preserve ordinary letters while losing a few special characters. KDP also asks for print text to be at least 7 points, but practical readability may require a larger size depending on the typeface and audience.

6. Correct metadata and pagination mismatches

The title, subtitle, author name, language, ISBN, and imprint in the files should match the details entered during title setup. Small differences such as initials, punctuation, or a subtitle present on the cover but missing in the metadata can lead to review issues. Check the cover, title page, copyright page, running heads, and any advertising pages.

Also check that numbered pages run in the intended sequence and no content page is missing. KDP permits designed blank pages, but its current quality guidance limits long blank sequences: no more than four consecutive blank pages at the beginning or middle, or ten at the end.

7. Troubleshoot Kindle eBook conversion separately

For a text-heavy reflowable eBook, use semantic paragraph and heading styles, real page breaks before chapters, and a linked table of contents. Remove print-only running heads, fixed page numbers, manual line breaks used for spacing, and repeated spaces used for alignment. Prepare and preview the eBook independently from the print interior.

KDP's current guide supports uploading DOC/DOCX directly or a KPF produced by Kindle Create, while Kindle Previewer can open EPUB, KPF, DOC/DOCX, HTML, and related eBook formats. Test phone, tablet, and e-reader views, changing font size and orientation. Look for:

• chapter headings stranded at the bottom of a screen;
• indents created with tabs or spaces;
• blank screens caused by stacked page breaks;
• oversized or tiny images;
• broken table-of-contents links;
• unreadable tables and callout boxes;
• missing scene-break symbols or special characters.

See PDF vs. EPUB for KDP for a format decision guide and KDP book formatting with AI for a broader production workflow.

A clean re-upload workflow

1. Duplicate the source manuscript and record the current version number.
2. Fix the underlying issue in that source file.
3. Export with a new filename so you cannot accidentally re-upload the old file.
4. Open the exported file locally and check page count, dimensions, fonts, and representative images.
5. Upload it to the correct KDP format and wait for processing to finish.
6. Review every flagged page, then scan the entire book—not only the pages KDP names.
7. For Kindle, test multiple device and font-size views. For print, order a physical proof copy after Previewer approval.
8. Keep the final source, upload file, and correction notes together for future revisions.