#165 · Validation & Quality Checks Tool

Check Sequential Number Column

Inspect a numeric ID column for gaps, duplicates, and out-of-order values, then download a CSV audit report.

Office File Tool

Audit sequence
row
rows
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How to use this office tool

  1. Select the sheet and number column.
  2. Process the file to inspect numeric values in row order.
  3. Review gaps, duplicates, and out-of-order entries.
  4. Download the CSV audit report.

What this tool does

The selected column is checked as an integer sequence. Non-numeric entries are reported rather than silently coerced.

expected next value = previous valid value + 1

The exported file is newly generated in your browser. The uploaded source remains unchanged.

Supported formats

XLSX, XLS, CSV, and TSV are accepted. Browser rewriting does not guarantee preservation of macros, charts, pivots, external links, or every advanced Excel feature.

FormatUse
XLSX / XLSWorkbook input; XLSX output
CSV / TSVDelimited table input

Tips for better results

  • Sort only if the intended sequence should be ascending.
  • Leading-zero IDs may be identifiers, not sequence numbers.
  • Investigate duplicates before filling gaps.

FAQ

Can the checker find both gaps and duplicates?

Yes. The report identifies missing ranges, repeated numbers, out-of-order values, and non-integer entries.

Should invoice numbers with prefixes be checked here?

No. This checker expects plain integers; prefixed identifiers should be audited with a text-key tool.

What spreadsheet formats can Check Sequential Number Column read?

It accepts XLSX, XLS, CSV, and TSV files. Advanced workbook objects may not be preserved when a new workbook is written.

Are uploaded files sent to a server?

No. Parsing and output generation run locally in the browser; the page does not upload cell data.

How should I protect IDs and leading zeros?

Keep identifier columns formatted as text and enable text protection when available. Always check the preview before exporting.

Processing safeguards

CheckBehavior
PrivacyLocal browser processing
PreviewLimited to 5–100 rows

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