validate · validate
KDP paperback file checker online
Check a KDP paperback interior and cover PDF against Amazon's published file specs and get a signed report; 20 free runs a day, then 5 credits per run, inputs up to 10 MB, up to 30 seconds per run.
result
Press Run. The result lands here, made by the real tool.
5 credits · ≤10 MB · ≤30 s · no login · 20 free/day
Keys are stored in this browser only. A key lets you buy credits and keep going after the free runs.
How it works
- Choose a file or paste your input; the form is already filled with a working example.
- Press Run. The tool executes on our server and returns the real result, with its size and time.
- Check the result below the form, then download it or copy it.
Limits
Each run is capped at 30 seconds and 10 MB of input. 20 free runs a day per visitor across all mint tools, no login. After that a run costs 5 credits; credits are bought once and attach to an API key.
Privacy
Your input is processed for the request and discarded afterwards. It is not kept and not used for anything else. Usage records keep only time, tool, status, duration and a salted hash of the IP address.
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Call it from code
curl -sS -X POST 'https://data.voiddo.com/v1/kdp_preflight' \
-F 'input={}' \
-F 'interior=@input.pdf'20 calls a day need no key. Beyond that: one-time credit packs, $5 for 500 credits, $9 for 1,000 credits, $29 for 4,000 credits. Get credits · llms.txt · OpenAPI.
Questions
Is this tool free?
Yes, 20 runs a day without an account. After that each run costs 5 credits.
Are my files stored?
No. The input is processed for the request and discarded afterwards.
Can I call it from my own code?
Yes. The same engine is available as an API at data.voiddo.com; the curl example on this page shows the request.