ProofStamp: Timestamped Evidence Capture by OnceWorks Tools

ProofStamp turns a region of any page into a labelled PDF in about twenty seconds. Drag to select, check the preview, add an optional label, and download a document already stamped with the page URL, title, and the capture time in both local time and UTC.

Built for QA engineers filing defect evidence into Jira or Linear, support engineers documenting what a customer saw, and compliance analysts collecting audit screenshots. Everything happens on your computer — no accounts, no uploads, no tracking. It makes no chain-of-custody or forensic claim; it stamps and labels what you captured.

Three free captures with every feature, then a one-time $7.99 unlocks unlimited. No subscription. Built by OnceWorks.