How to use this office tool
- Select a supported spreadsheet file.
- Choose the worksheet and review the available options.
- Create the result, inspect the limited preview, then download the new file.
#153 · Validation & Quality Checks Tool
Check Unique ID Column
Audit a spreadsheet key column for blank and duplicate IDs, review the problem rows, and download a practical CSV quality report. Your data stays on this device while the page is open.
Office File Tool
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What this tool does
Check Unique ID Column performs a focused office-file task in the browser and produces a separate result you can review before use.
Processing path: parse locally → check unique id column → generate a new downloadable file.
Keep the original file and verify a few representative rows in the download, especially when formulas or advanced workbook features are involved.
Supported formats
XLSX, XLS, CSV, and TSV inputs are accepted where the operation is meaningful. Workbook parsing uses SheetJS CE and previews are deliberately bounded.
| Format | Support |
|---|---|
| XLSX / XLS | Cell data and formulas; advanced Excel objects may not survive export |
| CSV / TSV | Delimited text with browser-decoding limits |
Tips for better results
- Use a clear header row and stable key column.
- Store identifiers as text when leading zeros matter.
- Test the output with a copy before adding it to a production workflow.
FAQ
Does Check Unique ID Column upload my workbook?
No. The selected file is read and processed locally by JavaScript in your browser.
Will formulas, charts, and macros be preserved?
The tool focuses on cell data and formulas supported by SheetJS. Advanced Excel features such as macros, charts, slicers, and Power Query may not be preserved.
How should I handle leading zeros and long IDs?
Store identifiers as text in the source workbook. Numeric cells may already have lost leading zeros before the file reaches this tool.
Can I use a large workbook?
Moderate workbooks are supported, but browser memory is limited. Split very large files and verify the downloaded result before relying on it.
Does the download overwrite my original file?
No. The tool creates a new Blob and downloads a separate result file; your original file remains unchanged.
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Processing summary
| Step | Purpose |
|---|---|
| Input | Read locally |
| Output | Check Unique ID Column |
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