Anticounterfeiting　techniques　based　on　physical　unclonable　functions　exhibit　great　potential　in　security　protection　of　extensive　commodities　from　daily　necessities　to　high-end　products.　Herein,　we　propose　a　facile　strategy　to　fabricate　an　unclonable　super　micro　fingerprint　(SMFP)　array　by　introducing　in　situ　grown　perovskite　crystals　for　multilevel　anticounterfeiting　labels.　The　unclonable　features　are　formed　on　the　basis　of　the　differential　transportation　of　a　microscale　perovskite　precursor　droplet　during　the　inkjet　printing　process,　coupled　with　random　crystallization　and　Ostwald　ripening　of　perovskite　crystals　originating　from　their　ion　crystal　property.　Furthermore,　the　unclonable　patterns　can　be　readily　tailored　by　tuning　in　situ　crystallization　conditions　of　the　perovskite.　Three-dimensional　height　information　on　the　perovskite　patterns　are　introduced　into　a　security　label　and　further　transformed　into　structural　color,　significantly　enhancing　the　capacity　of　anticounterfeiting　labels.　The　SMFPs　are　characterized　with　tunable　multilevel　anticounterfeiting　properties,　including　macroscale　patterns,　microscale　unclonable　pattern,　fluorescent　two-dimensional　pattens,　and　colorful　three-dimensional　information.　©　2020　American　Chemical　Society.