KDP expected cover size and submitted file size do not match? Learn what the two numbers mean, why full cover size is wider than trim size, and what to fix.
If KDP says your expected cover size and submitted file size do not match, the cover file KDP received is not the size it calculated for your current paperback settings.
This usually points to the uploaded file size, not the quality of the cover design. You may have uploaded only a front cover, missed the spine width, used an old page count, or exported a PDF that changed size.
If you are still setting up a Canva file before upload, start with the Canva cover export guide for KDP paperback. This article focuses on the KDP size error itself.
| KDP size pattern | What it usually means | First fix to try |
|---|---|---|
Submitted file is close to a front cover size, such as 11.000 x 8.500 | You may have uploaded a front-cover-only file instead of a full paperback cover | Build one back + spine + front cover PDF |
| Height matches, but width is too small | Spine width, page count, paper type, or full cover width may be wrong | Recalculate the current full cover width |
| Width is only slightly too narrow | Page count or paper type may have changed after the cover was designed |
| Generate a fresh KDP template |
| Both width and height are wrong | The design canvas, export settings, or a converter may have changed the PDF page size | Check the actual exported PDF page size |
| Submitted size is A4 or Letter | The export path may have used a document page size instead of the cover size | Re-export from a correctly sized source file |
Expected cover size is the full cover size KDP calculated from your current book settings.
For a paperback, KDP's paperback cover guidance says the cover file should include the back cover, spine, and front cover in one PDF. The full cover width includes:
bleed + back cover width + spine width + front cover width + bleedThe full cover height includes:
bleed + trim height + bleedThat is why a 6 x 9 paperback does not use a 6 x 9 upload PDF. 6 x 9 is the trim size of the finished book page. The uploaded paperback cover PDF is wider because it also includes the back cover, spine, and bleed.
KDP provides an official Print Cover Calculator and Templates page for this. You can also use the KDP Cover Size Calculator to calculate full cover width, height, spine width, bleed, and layout from your current book settings.
Submitted file size is the actual page size of the PDF KDP received.
It is not the size you meant to create. It is not the size written in your design file name. It is the real page size inside the exported PDF.
That matters because the export step can change things:
Use this check before changing the design:
| Where to look | Acceptable | Warning sign | What to fix |
|---|---|---|---|
| KDP error message | Expected and submitted size match | Any difference in width or height | Do not upload again until the source or export size is fixed |
| Expected cover size | Matches the full cover size from current KDP settings | You expect it to equal the front trim size | Recalculate the full paperback cover size |
| Submitted file size | Matches the actual exported PDF page size | It is A4, Letter, front-cover size, or an old cover size | Fix the source file or export route |
This is the most common misunderstanding.
If your book trim size is 8.5 x 11, your front cover panel is 8.5 x 11 before bleed. But your paperback cover upload is not only the front panel. It needs the back cover, spine, front cover, and bleed.
One Reddit example shows the mismatch clearly: KDP expected 17.320 x 11.250, but the submitted file was only 11.000 x 8.500. The thread does not include a final approval update, so it should not be treated as a complete repair case. But the size pair is useful: the submitted file looked like a single page or front-cover-sized file, while KDP expected a full wraparound cover.
Use this table to read the mismatch:
| Pattern | Likely meaning | What to fix |
|---|---|---|
| Submitted width is close to front cover width | Uploaded front cover, not full cover | Build a back + spine + front wraparound cover |
| Height matches but width is wrong | Spine width or full cover width is off | Recalculate the current full cover width |
| Width is close but slightly too small | Page count, paper type, or spine width may have changed | Generate a fresh KDP template |
| Both width and height are wrong | Export or converter may have changed the page size | Check the PDF properties and source canvas size |
| Submitted file is A4 or Letter | Export used a document page size | Re-export from the correctly sized source file |
Spine width is part of the full cover width. KDP's cover sizing depends on page count and paper type, so a cover that fit one version of the book can stop fitting after the manuscript changes.
In one KDP page-count case, a user had previously published a book with one cover size, then saw KDP expect a slightly wider cover for a new book. The user later realized the new book had more pages. That made the spine wider, which changed the expected full cover width.
This does not mean every small width difference is caused by page count. But page count is one of the first things to check.
| Where to look | Acceptable | Warning sign | What to fix |
|---|---|---|---|
| Trim size | Same as the cover was designed for | Trim size changed after cover design | Recalculate full cover size |
| Page count | Final manuscript page count | Manuscript was revised, reflowed, or reformatted | Recalculate spine and full cover width |
| Paper type | Same as the template used | Paper type changed | Generate a new template |
| Binding / format | Same format as the cover file | Paperback or hardcover setting changed | Rebuild for the current format |
Start with the numbers before changing the PDF.
Open the KDP title setup and check:
If any of these changed after the cover was made, the expected cover size may have changed too.
Use KDP's Print Cover Calculator and Templates, or calculate the size with the KDP Cover Size Calculator.
Do this from the current book settings, not from memory and not from a previous book.
Check whether your source design is truly the full cover size.
| Source file state | Meaning | Next step |
|---|---|---|
| Source file is only the front cover | It cannot match KDP paperback full cover size | Build a full cover layout |
| Source file is full cover but old page count | Spine width may be outdated | Update the source file using current dimensions |
| Source file is correct but exported PDF is wrong | Export route changed the page size | Re-export and check PDF properties |
| Source file and PDF both match current KDP size | The size error may be coming from another issue | Recheck KDP settings and upload path; if the PDF looks fine but is still rejected, use the PDF cover rejection guide |
If your submitted file is front-cover-sized, do not stretch it into a full cover. You need a full layout with back cover, spine, and front cover.
If your old full cover is only slightly too narrow, update the source file with the current spine width. Stretching the final PDF can distort the front cover, spine text, barcode area, and safe zones.
After export, open the PDF properties or inspect it with a PDF tool. Confirm the PDF page size matches KDP's expected cover size.
This is where converter problems show up. A JPG-to-PDF case involved tools adding margins, scaling, A4 sizing, or unexpected zoom. The user eventually produced an exact-size PDF, but the lesson is broader: always check the final PDF page size, not only the source image.
If KDP expects 17.930 x 11.250 and your submitted file is 15.433 x 11.250, it can be tempting to drag or scale the PDF wider.
That can create new problems.
Scaling a finished cover can:
Fix the source layout instead. Use the current full cover dimensions, update the spine width, then export a new PDF.
Sometimes the cleanest fix is to rebuild from the right size.
| Situation | Best next step |
|---|---|
| You only have a front cover | Build a full paperback cover file |
| You lost the editable source file | Rebuild from current KDP dimensions |
| Page count changed and the old spine no longer fits | Update the source layout with the new spine width |
| Export keeps producing A4, Letter, or scaled PDFs | Change the export route or rebuild in a cleaner file |
| The full cover layout is confusing or repeatedly misaligned | Use the KDP Book Cover Generator to create a new KDP cover draft |
If you want to fix the existing file, start with the KDP Cover Size Calculator. If you only have a front cover or no reliable source file, rebuilding may be faster than patching.
Because paperback cover size is not the same as trim size. KDP expects a full cover PDF with back cover, spine, front cover, and bleed. The trim size is only the finished page size of the book.
That often means the trim height and vertical bleed are right, but the full cover width is wrong. Check spine width, page count, paper type, left/right bleed, and whether you used the current KDP template.
Yes. Page count affects spine width, and spine width is part of the full cover width. If the manuscript was revised or reformatted, regenerate the template before re-uploading the cover.
Any design or export tool can produce the wrong final PDF size if the canvas, export settings, or converter changes the page dimensions. The important check is the exported PDF page size, not the design preview.
Rebuild or update the source file when the full cover size is wrong. Resizing the final PDF can distort the artwork and move spine, barcode, or safe-area elements.
No. Fixing the size only addresses the size mismatch. KDP may still flag bleed, safe area, barcode, PDF structure, metadata, manuscript, or policy issues.
If the size matches but KDP still rejects the PDF cover, check the PDF cover rejection guide.