XLSX/CSV to JSON Converter

Convert your spreadsheet files to JSON format instantly

File Converter

Upload an XLSX, XLS, or CSV file to convert it to JSON format

Drop your file here or click to browse

Supports XLSX, XLS, and CSV files

Column map format

Stores column headers once in a map array and encodes each row as a value array in data, reducing file size for large datasets with many repeated column names.

Complex spreadsheet mode

Extracts rich spreadsheet structure — formulas, cell types, merged ranges, multi-sheet support, and optional styling. Ideal for preserving spreadsheet fidelity or making data LLM-consumable.