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Adv."],"published-print":{"date-parts":[[2026,5,22]]},"abstract":"<jats:p>Ultrathin conductive hydrogels provide conformal and stable contact for flexible bioelectronics, which is critical for achieving the low impedance necessary for high-quality electrophysiological signal acquisition. However, their low modulus has made these hydrogel devices difficult to fabricate and handle. To overcome this, we present an on-demand formation strategy for creating ready-to-use, ultrathin (down to 1 micrometer) hydrogel-based bioelectronics that combine tissue-like softness with ready-to-use functionality. By using cross-linked electrospun polyvinyl alcohol (PVA) fiber mats, we produce liquid metal\u2013patterned hydrogel tattoos (LMHTs). These devices transform from easy-to-handle dry films into adhesive, conformal hydrogel interfaces upon hydration. 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