Effortless Spreadsheet Normalization With LLM involves transforming messy data into a tidy dataset for easier analysis and decision-making.Tidy data is structured for manipulation, visualization, and modeling, linking dataset structure with semantics.Developing a workflow with LLM-based modules and business logic helps reshape spreadsheets into machine-readable formats.The process includes Spreadsheet encoder, Table structure analysis, Table schema estimation, Code generation, and Conversion to Excel format.Using LLMs enables efficient analysis of input data, ideal table schema estimation, and accurate code generation for data transformation.The workflow aims to automate and simplify the process of normalization and restructuring of messy datasets.LLMs improve flexibility in dealing with various data contexts and reduce the need for manual data cleaning and formatting.The workflow approach based on LLMs is deemed more robust, stable, and maintainable for data normalization compared to autonomous agents.Future articles will further explore related topics to enhance data processing and analysis using advanced techniques like LLMs.Efforts like CleanMyExcel.io aim to provide users with tools to easily test and normalize their own datasets for enhanced data analysis.