Inventory management continues to play a critical role in the success of an organization. It is the collection of all the materials and goods stored, whether for use to complete the production process or for sale to the customer. The efficiency of inventory management is a challenge for all companies that have a warehouse or distribution center. Therefore, all firms need to adapt their business strategies to survive in a highly competitive market by applying tools or systems to support inventory control and management. This research was conducted to increase the efficiency of inventory management of an industrial tool distributor in Thailand by using the data visualization tool. It focused on the inventory planning process. Lean manufacturing was implemented to identify, improve and eliminate unnecessary activities in operations. Microsoft Power BI is a data visualization tool that was used in this study to support officers in operational decision-making and planning. It facilitated the monitoring of inventory levels, evaluating the value of inventory, and analyzing the key vendors on an almost real-time basis. The results showed that unnecessary activities were improved and simplified by integrating the data visualization tool. The lead time of the inventory planning process was decreased by 76.19% from 10.5 days to 2.5 days per time. It can increase the efficiency of inventory management.