ViewportProof — Responsive Website QA Reports

Capture responsive website widths and create branded client QA reports locally.

Testing responsive pages is only half the work. You still have to record the width, decide whether an issue is real, show exactly where it happens, and package everything so a client or teammate can act on it. ViewportProof turns that repetitive process into one clear workflow inside Chrome. Capture the current page at mobile, tablet, and desktop widths. Review the results in a guided decision queue, confirm or dismiss potential issues, pin findings to their exact locations, and export a professional evidence package. CAPTURE • Test 390px, 768px, and 1440px widths in one run • Preserve full-page PNG screenshots • Record both requested and measured viewport widths REVIEW • Work through findings in a clear, guided queue • Confirm or dismiss each issue before it enters the report • Pin findings to the exact location where they occur • Add your own findings and edit recommendations • Keep technical evidence available without letting it overwhelm the review EXPORT • Download a branded, searchable PDF report • Include the original full-resolution PNG captures • Add a SHA-256 integrity manifest • Give developers, project managers, clients, and stakeholders everything they need to act ViewportProof is useful for developers, freelancers, agencies, QA teams, and product managers who need something clearer than “it breaks on mobile.” PRIVACY FIRST Your captures, URLs, page titles, findings, client details, notes, logos, PDFs, and PNGs remain on your computer. Anonymous product analytics are optional and disabled by default. No account, AI service,axon Google authorization, or cloud rendering service is required. IMPORTANT LIMITATION ViewportProof validates responsive CSS widths in desktop Chrome. It does not emulate physical phones, Safari, touch input, mobile user agents, device pixel ratios, or independently scrolling application panels. ViewportProof is completely free. Try it on a real project and send your feedback to help make it even better.