Evidence Snapshot

One-click web evidence: full-page screenshot + MHTML of the current page, SHA-256, OpenTimestamps + RFC-3161, one ZIP.

Evidence Snapshot saves the web page you are looking at as a self-contained, independently verifiable evidence bundle: one ZIP file that anyone can check later with standard tools, with no account and no special software. Click the toolbar icon, press "Preserve this page", and the extension: • Saves the page as a single MHTML file (the real text, links and images, not just a picture), as soon as the page has finished loading. • Takes a sharp full-page screenshot of the entire scroll height, not just the visible area. Lazy-loading images are loaded first, pinned headers and floating bars are hidden so they don't repeat down the image, and very tall pages are split into several full-resolution PNG parts, never cut through the middle of a photo. • Handles posts that open as a pop-up (Xiaohongshu notes, Instagram posts): captures the pop-up as you see it, plus its whole caption and comment panel. • Computes a SHA-256 fingerprint of every file and combines them, the page URL and the capture time into one "evidence digest". • Timestamps that digest two independent ways: OpenTimestamps (anchored to the Bitcoin blockchain) and RFC-3161 (a signed timestamp from the free freetsa.org authority, precise to the second). Or tick "screenshot only" for a quick capture without timestamps. • Packs everything (screenshots, MHTML, manifest, plain-text summary, step-by-step verification instructions and timestamp proofs) into evidence-<id>-<date>.zip and downloads it. Optionally paste an archive.today link first (from its "share" button). It's a neutral third-party copy that survives the original being deleted, and it is included in the digest too. Private by design: everything runs on your own computer. The page's content never leaves your machine. Only the 32-byte hash is sent to the timestamp servers, and it cannot be turned back into the page. No analytics, no tracking, no developer server, no remote code. Bundles use the same format as the web version at evidence-snapshot.pages.dev: drop a ZIP into its "Verify" tab to re-check every file, or upgrade a pending OpenTimestamps proof once it is confirmed on the blockchain. While a screenshot is being taken, Chrome shows a "started debugging this browser" bar. This is normal: the full-page capture uses Chrome's built-in DevTools screenshot function, and the bar disappears when the capture finishes. Works in desktop Chrome, Edge and Brave (Chrome 116+). Not legal advice. For important matters, also use a certified evidence service.