A check that cannot be determined from the file says "not evaluable" — never a silent pass.
The problem
A check that cannot be determined from the file says "not evaluable" — never a silent pass. It looks fine right up until it doesn't — in a viewer, on screen, in the happy path — and the failure only shows at the point where it's expensive to fix.
What actually happens
This is a determinable property of the file: you can check it deterministically, without running the document and without guessing. Preflight does exactly that as part of its correctness-first pipeline.
The honest caveat
not_evaluable is a first-class verdict; it never counts as a pass. That distinction is the whole point of the tool — a check that can't be determined from the file says not evaluable, never a silent pass. A QC tool that passes everything hasn't checked your document; it has flattered it.
Try it
Preflight parses the print formats most tools can't open (PDF, AFP/MO:DCA, PCL 5, PostScript, IPDS) and runs deterministic checks like this one — free, in your browser, nothing uploads. → https://preflightdocs.com
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