// free-toolXLSX → CSV
Drop an Excel file, pick a worksheet if there's more than one, and download it as clean CSV. Parsing happens locally, so spreadsheets with sensitive data never leave your machine.
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.
CSV is plain data — formulas export as their last computed value and visual formatting is dropped, which is standard for any XLSX-to-CSV conversion.
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.