Developer Tool Guide
About Excel/CSV/JSON Converter
Niuma Tools Dedicated to improving the daily efficiency of professionals and frontend developers. This is a ready-to-use, secure, and highly efficient productivity tool. Free online spreadsheet converter. Parse Excel, CSV, and JSON locally, preview sheets, and export to JSON, CSV, or XLSX without uploading files.
Usage Notice & Privacy Guarantee
We have always adhered to the core development philosophy of "Offline First, Security First". Many features on this page are implemented through the local computing APIs of modern browsers, effectively solving the unpredictable privacy leakage risks faced when sending files and data to other websites. You can save it to your bookmarks as a solid and reliable part of your daily development, testing, or content creation workflow.
Related keywords: Excel to JSON / CSV to JSON / JSON to Excel / Excel to CSV / spreadsheet converter / online Excel tool