Mask values in selected Excel columns and download a new workbook while keeping the original file untouched. The original file stays unchanged.
This column redaction tool examines selected column names into masked values in a new workbook. It performs the work locally and leaves the source file untouched.
Keep the source file and review the output before using it in a production workflow.
The tool accepts XLSX, XLS, CSV, and TSV. It reads cell data in the browser; macros, charts, external links, and advanced Excel formatting are outside its preservation scope.
| Format | Support |
|---|---|
| XLSX / XLS | Cell data and workbook structure where applicable |
| CSV / TSV | Delimited text parsed locally |
No. The column redaction tool reads and processes the selected file inside your browser. Your spreadsheet is not sent to Calloffice.
XLSX, XLS, CSV, and TSV files are accepted. Older or unusually structured workbooks may lose unsupported Excel-only features in a generated output.
Blank cells remain distinguishable from zero and text. The exact treatment is shown in the preview and described in the downloaded result.
The tool focuses on cell data and its stated task. Formula text is read where relevant, but Excel calculation behavior, charts, macros, and advanced formatting are not guaranteed.
Review the bounded preview and open the downloaded file in a spreadsheet editor. Keep the original workbook until column names, dates, and special values have been verified.
| Stage | Behavior |
|---|---|
| Input | Read locally in the browser |
| Task | Selected column names into masked values in a new workbook |
| Output | New downloadable file |