// free-toolXLSX → JSON
Drop an Excel file and each worksheet row becomes a JSON object keyed by the header row — the fastest way to get spreadsheet data into an app or API. Conversion runs entirely in your browser.
no signup · no watermark · unlimited use
No. This tool runs entirely in your browser using local processing — your files never leave your device, which also makes conversion instant with no upload wait.
Numbers stay numbers; dates are exported in ISO format where Excel stored them as real dates. Text that merely looks like a date stays text.
Parse CSV (with headers) into clean JSON arrays.
Flatten a JSON array of objects into spreadsheet-ready CSV.
Convert JSON into clean, readable YAML for configs.
Parse YAML (with anchors and multi-docs) into formatted JSON.
Serialize JSON objects into well-formed, indented XML.
Parse XML into JSON, preserving attributes and structure.
I build fast, privacy-first web applications with Next.js — these converters run entirely in the browser, and yours can too.