Free DOCX preflight
Browser-only print PDF preflight
Check a print-ready book PDF before the upload fails.
Inspect the actual interior file locally for readable page objects, dimensions, encryption, font-embedding signals, and a complete ending—without uploading the manuscript.
✓PDF stays in your browser✓Page-size and encryption checks✓Honest compressed-file limitations
What the fast PDF check can prove
The checker confirms a PDF header, counts visible page objects, reads visible MediaBox dimensions, detects encryption markers, compares font resources with embedded font streams, and looks for the final EOF marker. Mixed page sizes and encryption are strong reasons to re-export before uploading.
Some PDFs compress their object tables, so a browser string-level preflight cannot see every page or font detail. The result labels uncertainty instead of pretending that an invisible value passed.
What still requires visual and prepress proofing
Open every page at full size. Check margins, gutter, bleed, blank pages, image resolution, transparency, overprint, color intent, crop marks, and whether text is selectable. Confirm the current platform settings and use a full prepress application when the book has production risk.
FAQ
Frequently asked questions
Does this upload my PDF?
No. The free check reads the selected file in the current browser tab.
Can it guarantee every font is embedded?
No. It reports visible font-resource signals, but compressed objects can hide details. Confirm embedding with a full PDF preflight before a high-risk print run.
Why are mixed page sizes a problem?
A normal book interior should use one intended page geometry. An accidental different page can trigger upload errors or unexpected scaling.
Need a repaired replacement, not only a warning?
A release pass keeps the corrected interior, EPUB, cover, metadata, and sample tied to one source version.