A clear understanding of seed physical characteristics is fundamental in designing and operating agricultural equipment involved in sowing, harvesting, processing, packaging, and storage. This investigation explores how varying moisture content influences the physical attributes of linseed. Moisture levels in the seeds were adjusted between 4.5% and 20.5% (wet basis), and several parameters were examined. Results showed that seed length, width, and thickness increased from 4.67 mm to 4.96 mm, 2.27 mm to 2.44 mm, and 0.92 mm to 0.96 mm, respectively, with rising moisture content. In parallel, aspect ratio increased from 0.486 to 0.492, geometric diameter from 2.14 mm to 2.26 mm, and surface area from 12.55 mm² to 14.11 mm². A minor but consistent rise in sphericity was also noted. Meanwhile, bulk density decreased significantly from 768.4 kg/m³ to 588.5 kg/m³, whereas true density showed a modest increase from 1005.2 kg/m³ to 1024.4 kg/m³. Porosity expanded from 23.56% to 42.55%, and the angle of repose grew from 24.40° to 31.40°, suggesting a decline in flowability with increased seed moisture. Each parameter exhibited a linear trend with respect to moisture levels. Statistical analysis yielded high regression coefficients (R² > 0.95) and p-values under 0.05 for all traits, indicating a significant dependency on moisture content. Standard measurement techniques were employed to ensure consistency and accuracy in data collection. The insights gained from this study are essential for engineers and technologists involved in seed processing, as they underline the necessity of considering moisture content when designing storage facilities, handling systems, and machinery. Ultimately, the results emphasize that moisture variations have a marked effect on the physical behavior of linseed, making it a key variable in ensuring product quality and post-harvest efficiency.