Local XLSX tools

Open and view XLSX files online

Open XLSX workbooks locally in your browser. Inspect sheets, search values, and choose editing, conversion or comparison without uploading your file.

XLSX Editorby Loamstack

Start

Open an Excel workbook

Explore your worksheets and cell values in one workspace.

Choose or drop an .xlsx file up to 50 MB. Workbook contents stay on this device.

Explore your workbook: Use Files and sheet tabs to move between worksheets. The ribbon and formula bar keep cell commands close to your data.
Edit and save: Inspect cell values, then open the editor to make changes. Export a sheet as CSV or JSON from Tools.
Formula results: Existing formulas display their stored results. Formulas are not recalculated when cells change.

Keep your original workbook

Selected files stay on your device. The source editor retains the original XLSX package and supported changes. Data exports use stored cell results and do not preserve workbook formulas or formatting; editing and calculation remain separate actions.

Use Edit source to keep working with the same workbook. Complex formulas and unsupported source features report their limits. Encrypted workbooks are not supported.