Simple, sensitive high performance thin layer chromatography method for the estimation of gallic acid and quercetin in in-house polyherbal blend has been developed and validated. Methanolic solution of herbal blend comprising of Emblica officinalis, Camellia sinensis and Garcinia cambogia was used for analysis. The sepa-ration was performed on TLC aluminum plates precoated with silica gel G60 F254 and toluene : ethyl ace-tate : formic acid (5:1.5:1 v/v/v) at 254 nm scanning wavelength. The system gave well resolved peaks for gallic acid and quercetin at Rf 0.14 and Rf 0.29 respectively. The method validated as per ICH Q2R1 guide-lines which shows regression co-efficient 0.9939 for gallic acid and 0.9988 for quercetin in range of 2–6 μg/ml. Recovery of gallic acid and quercetin was found in range of 98–102 % which confirms the accuracy of method. Precision study (interday & intraday) showed that the relative standard deviation is less than 2 %, showing method is well precise. Proposed validated HPTLC method is simple, precise, specific, robust and accurate, and could find application in routine quality-control analysis. The method was used for quantitative estimation of gallic acid and quercetin in the polyherbal blend and was found as 1.648 % w/w and 3.165 % w/w respectively.