CellWeb — free spreadsheet editor that runs in your browser
CellWeb (셀웹) is a free spreadsheet editor at hangulweb.pages.dev/cell/. Open and edit .xlsx, .xls and CSV spreadsheets in your browser and save as .xlsx. Calculates 503 Excel functions. Files never leave your browser.
Features
- Opens Excel (.xlsx, .xlsm, legacy .xls), CSV and TSV files; drag a file onto the window to open it.
- Reads Korean CSV files saved as EUC-KR or UTF-16 without broken characters.
- Calculates 503 Excel functions; only dependent formulas are recalculated when values change.
- Formatting, borders, merge, number formats, conditional formatting, charts, PivotTables, AutoFilter, freeze panes, data validation, comments and sheet protection.
- Saves to .xlsx and CSV; print to PDF from the print dialog.
How to use
- Open CellWebGo to hangulweb.pages.dev/cell/.
- Open a fileChoose Open (Ctrl+O) or drag an .xlsx, .xls or .csv file onto the window.
- EditType values or formulas; format cells from the Home tab or with Ctrl+1.
- SavePress Ctrl+S to save as .xlsx, or use Save as CSV.
How files are handled
CellWeb never sends your files to a server. Reading, converting and saving all happen inside the web browser on your device, and results are saved only on that device. There is no sign-up; usage statistics are sent without document contents only if you agree in the consent bar.
FAQ
Can I open XLSX files without Excel?
Yes. CellWeb opens .xlsx, .xls and .csv files in your browser and saves them as .xlsx.
Are formulas calculated?
Yes. 503 Excel functions are calculated. Files containing functions that are not supported yet show the values saved by Excel.
Is CellWeb made by Microsoft?
No. CellWeb is a program made by NSER Inc. and has no relationship with Microsoft.
Trademarks
CellWeb is a program made by NSER Inc. and has no relationship with Microsoft. 'Excel' and 'Microsoft Excel' are trademarks of Microsoft and are used only to describe compatible file formats.