About this tool
Spreadsheet editor opens CSV and Excel workbooks in a full browser grid where you can edit cells, apply formulas, format values, and manage multiple sheets. It is built for quick corrections and exports without installing desktop software.
Workbooks are processed and kept locally. Files are not uploaded, and optional recovery storage, if you enable it, stays in your browser. Excel-specific features that cannot be preserved are reported before you download a new copy.
How to use it
- Open or drop a CSV, TSV, XLSX, or XLSM file, or start from a sample workbook.
- Edit cells directly, or use the formula bar for values and formulas.
- Format cells and add sheets as needed from the toolbar.
- Download the workbook in a format suitable for your next tool.
What you can do in the editor
- Open CSV, TSV, XLSX, and XLSM files and edit cells directly.
- Use formulas such as =SUM(C2:C20), =AVERAGE(), and =IF() with automatic recalculation.
- Work with multiple sheets in Excel workbooks, and apply number formats, bold text, and column widths.
- Export back to CSV for data exchange or to XLSX to keep sheets and formatting.
The workbook is processed entirely in your browser. That makes the editor suitable for customer lists, payroll exports, and other sheets you would rather not upload to an online office suite.
CSV vs. Excel files
CSV stores only values: no formulas, formatting, or multiple sheets. When you export to CSV, formulas are saved as their calculated results and only the active sheet is included. Use XLSX when you need to keep that structure. Macros in XLSM files are never run, and charts, pivot tables, and images are not editable.
Excel and other spreadsheet programs sometimes change data when opening CSV files: leading zeros are dropped from codes, long numbers turn into scientific notation, and text like 3-4 becomes a date. Opening the file here first lets you inspect and fix values before they are altered.
Frequently asked questions
Are Excel files uploaded for processing?
No. Import, editing, and export all happen locally in the browser; the file never leaves your device.
Which Excel features are not preserved?
Some advanced workbook features such as certain charts, macros, and external links cannot be kept. The editor warns you before downloading so you can review the differences.
Does recovery storage keep my data?
Only if you enable it, and then only in your browser’s local storage. You can clear it at any time from the editor.
Which delimiter does my CSV use?
Files from English-language software usually use commas. Many European exports use semicolons, because the comma is the decimal separator there. Choose the delimiter that matches the file if columns do not split correctly.