High-quality　(K0.5Na0.5)NbO3　(KNN)-based　transparent　ceramics　are　ideal　candidates　for　3D　optical　information　storage　and　information　anti-counterfeiting　encryption.　However,　conventional　single-mode　storage　and　convenient　replicability　hinder　their　practical　application.　Here,　by　introducing　Er3+　and　Sr2+　into　a　KNN　matrix,　xSr-1Er-KNN　translucent　ceramics　were　prepared,　and　reversible　modulations　of　ceramic　colors,　transmittances,　down-shifting　photoluminescence　(DSPL)　and　up-conversion　photoluminescence　(UCPL)　were　achieved.　At　room　temperature,　the　photochromic　(PC)　behavior　induced　high　modulation　contrasts　of　both　88%　for　dual-mode　DSPL　and　UCPL　under　the　excitations　of　485　and　980　nm,　respectively,　exhibiting　excellent　multi-optical　information　storage.　Moreover,　the　xSr-1Er-KNN　ceramics　showed　conspicuous　low-temperature　optical　temperature　sensing　performance　through　fluorescence　intensity　ratio　technology　(a　maximum　relative　sensitivity　of　0.023　K−1　was　obtained　at　213　K).　The　Er3+　and　Sr2+　codoping　in　KNN　not　only　improved　the　transmittance　but　also　enriched　intermediate　trap　levels　to　significantly　increase　the　number　of　color　centers,　and　improve　the　PC　contrast　and　modulation　degrees　of　both　the　DSPL　and　UCPL　intensities.　The　potential　applications　of　the　xSr-1Er-KNN　ceramics　at　distinct　temperatures　based　on　their　diverse　optical　behaviors　can　guide　the　development　of　other　optical　multifunctional　materials　and　devices.　©　2024　The　Royal　Society　of　Chemistry.