Spreadsheet Converter
XLS · XLSX · ODS · CSV · TSV · JSON · XML — pick your source, pick your target, done. Runs entirely in your browser.
How Spreadsheet Converter works
Any XLS, XLSX, ODS, CSV, TSV, JSON, or XML file. Everything is parsed in the browser.
Choose XLSX, XLS, CSV, ODS, JSON, or XML from the format strip.
The converted file downloads instantly. All sheets round-trip; cells are sanitized to defuse spreadsheet formula-injection payloads.
Frequently asked
Which formats can I convert between?+
Any-to-any: XLS, XLSX, ODS, CSV, TSV, JSON, XML. For CSV/JSON/XML with multiple input sheets, the first sheet is used; for XLSX/XLS/ODS outputs, multi-sheet workbooks are preserved.
Is the file uploaded anywhere?+
No. All parsing and writing happens locally in your browser. Your data never leaves your device.
What about formula injection?+
Cells starting with =, +, -, @, tab or CR are prefixed with an apostrophe so they cannot execute as formulas when the output file is opened in Excel or Sheets.
Are formulas preserved when converting between spreadsheet formats?+
Values are always preserved. Formulas are preserved when converting between XLSX ↔ XLS ↔ ODS. CSV/JSON/XML formats have no concept of formulas — only values are exported.