Power users who save thousands of bookmarks end up with a graveyard of links they never revisit. Folders do not scale, search relies on remembering titles, and duplicates pile up across devices and browsers. The problem is not saving links; it is finding and reusing them later. We call it TagVault. TagVault ingests your existing bookmark exports and live browser saves, then uses AI to auto-tag each link based on page content, deduplicate near-identical entries, and resurface relevant items when you search or browse related topics. The result is that a messy dump of 5,000 bookmarks becomes a searchable personal knowledge base. The MVP is a browser extension plus a web app: import bookmarks via standard HTML export, run auto-tagging on page content, flag and merge duplicates, and offer full-text plus tag search. Revenue comes from a subscription for power users, likely tiered by bookmark volume and archival storage, since the target audience already understands paying for productivity tools. Go-to-market starts where these users live: Show HN launches and self-hosted community threads, where bookmark managers repeatedly surface. Growth loops come from shareable public collections and tag pages that pull in organic search traffic, plus referral incentives tied to storage upgrades.