PDF Tools: Checking the Download, Not Just the Preview
A PDF tool can display the right preview and still download the wrong document. A successful button click does not establish that page order, rotation, text, or visual content survived the export. The useful test target is the file the user receives. PDF Tools is a public browser application for everyday document operations. This case study examines its export-validation design and local-processing boundary using the public source snapshot, reviewed on 29 October 2026. It describes the evidence in that repository; it does not report a new benchmark or independent security certification. ...