How does Cover Pass-Check know if my cover will pass KDP review?

It reads your finished file in the browser and compares it to KDP's published spec and the exact dimensions for your trim, paper, and page count — full-cover size, bleed/wrap, resolution, embedded fonts, color space, page count, and file size. It reports each as pass, warn, or fail with the fix. It verifies the file's measurable properties; your artwork and KDP's own review are still yours to own, so a green report means the dimensions and spec are correct, not a guarantee of acceptance.

Is my cover file uploaded anywhere?

No. The entire check runs in your browser — the file never leaves your device and nothing is stored on a server. It's the same privacy-first approach as the free calculator.

What's the difference between Author and Studio?

Author ($19) checks one cover at a time — perfect for a single book launch. Studio ($49) adds batch mode: drop a whole folder of covers and get a worst-first pass/fail table with CSV export, built for publishers shipping many titles.

Do I get a refund if it doesn't help?

Yes — a 7-day, no-questions-asked refund through Gumroad. Email your receipt and we'll process it.

Cover Pass-Check

Will KDP reject your cover? Check before you upload.

Upload your finished KDP cover and know it will pass review — before you submit.

Get Pass-Check $19

Try the free calculator first

Already purchased? Unlock with your license key →

Checked in your browser — your file is never uploaded.

Set your book

Pick format, trim, paper, and page count — the same inputs as the free calculator.

Drop your cover

PDF, PNG, or JPG. It's read in your browser and never uploaded.

Get the verdict

A pass/fail report with the exact fix for anything KDP would reject.

Catches what gets covers rejected

The most common KDP rejections are wrong full-cover size, missing bleed, low resolution, and fonts that aren’t embedded. Pass-Check measures every one against your exact book and tells you how to fix it — here’s a real report on a trim-sized file:

Full-cover size matches the exact dimensions for your trim, paper, and page count
Bleed (paperback) or wrap (hardcover) is present on every edge
Resolution is at least 300 DPI at the printed size
All fonts are embedded (PDF)
Color space is print-ready — CMYK preferred, RGB flagged
It's a single flattened page (PDF)
File size is within KDP's 40 MB recommended / 650 MB hard limits

KDP will likely reject this

At least one hard requirement isn't met. Fix the items below and re-check.

my-cover-6x9-300p.pdf (sample)

File format
PDF — the format KDP wants for a print cover.
Single-page PDF
One flattened page (back + spine + front).
Full-cover size
Found 12.676″ × 9.000″; KDP needs 12.926″ × 9.250″ for a 300-page 6×9″ paperback.
Fix: Resize the document to exactly 12.926″ × 9.250″.
Bleed present
File is trim-sized — the 0.125″ bleed is missing on every edge.
Fix: Add 0.125″ bleed on all four sides (final size 12.926″ × 9.250″).
Resolution
Vector / text PDF — resolution-independent.
Fonts embedded
1 font(s) not embedded: Helvetica.
Fix: Embed all fonts, or convert text to outlines before exporting.
Color space
RGB. KDP accepts it but prefers CMYK; colors may shift on press.
Fix: Convert to CMYK and flatten transparency for predictable print color.
File size
9.0 MB — within KDP's recommended ≤ 40 MB.

Can’t auto-verify — confirm these yourself

Spine text
Spine is wide enough for text (300p, spine 0.676″).
Barcode area
Leave a 2″ × 1.2″ clear area at the bottom-right of the back cover for KDP's barcode.

One purchase. Two ways to work.

Author

$19

For your book launch. Check one cover at a time, as many times as you need.

Single-file pass/fail report
Every check above, with the fix for each
2,500-template bonus pack + cheat sheet
Lifetime access + free spec updates

Get Pass-Check $19

Studio

$49

For volume publishers. Drop a whole folder of covers and get a pass/fail table.

Everything in Author
Batch mode — check many covers at once
Worst-first results table + CSV export
Built for low/no-content publishers shipping at scale

Get Pass-Check Studio $49

7-day no-questions refund · secure checkout via Gumroad · Independent tool, not affiliated with Amazon, Kindle Direct Publishing, or any KDP-related trademark.

Frequently asked

How does Cover Pass-Check know if my cover will pass KDP review?: It reads your finished file in the browser and compares it to KDP's published spec and the exact dimensions for your trim, paper, and page count — full-cover size, bleed/wrap, resolution, embedded fonts, color space, page count, and file size. It reports each as pass, warn, or fail with the fix. It verifies the file's measurable properties; your artwork and KDP's own review are still yours to own, so a green report means the dimensions and spec are correct, not a guarantee of acceptance.
Is my cover file uploaded anywhere?: No. The entire check runs in your browser — the file never leaves your device and nothing is stored on a server. It's the same privacy-first approach as the free calculator.
What's the difference between Author and Studio?: Author ($19) checks one cover at a time — perfect for a single book launch. Studio ($49) adds batch mode: drop a whole folder of covers and get a worst-first pass/fail table with CSV export, built for publishers shipping many titles.
Do I get a refund if it doesn't help?: Yes — a 7-day, no-questions-asked refund through Gumroad. Email your receipt and we'll process it.