#226 · Validation & Quality Checks Tool

Spreadsheet Schema Validator

Check whether a table follows a compact column schema for required values and common data types.

Office File Tool

Choose exactly one file
row
rows
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How to use this office tool

  1. Select the required spreadsheet file.
  2. Choose the worksheet and adjust the available options.
  3. Select Validate schema and inspect the bounded preview.
  4. Download the newly generated result file.

What this tool does

Check whether a table follows a compact column schema for required values and common data types.

Column headers carry compact rules such as name:text!, age:number, or joined:date. A trailing exclamation mark makes the field required; an untyped header defaults to text.

Files remain on this device. Keep a backup of the source file and review generated reports before acting on them.

Supported formats

Reads XLSX, XLS, CSV, and TSV. Supported header types are text, number, date, boolean, and email. Validation is structural and does not replace domain review.

FormatSupport
XLSX / XLSBrowser parsing with SheetJS CE
CSV / TSVDelimited table input
OutputNew XLSX, CSV, JSON, or YAML report

Tips for better results

  • Use a clear header row and unique column names.
  • Keep identifiers such as postal codes stored as text.
  • Check dates, large integers, and formula results in the preview.
  • For sensitive workbooks, close the tab after downloading the result.

FAQ

Does the schema validator upload my file?

No. The selected file is read and processed locally by JavaScript in your browser. This page does not send its contents to a processing server.

What happens to formulas and formatting in this schema validator?

Reads XLSX, XLS, CSV, and TSV. Supported header types are text, number, date, boolean, and email. Validation is structural and does not replace domain review.

How large a file can I process with the schema validator?

The page enforces a 50 MB per-file and 1,000,000-cell safety limit. Practical capacity also depends on your device memory and browser.

Can I review the schema validator result before downloading?

Yes. A bounded preview and summary statistics appear after processing. The full newly generated result is available from the Download button.

Why might the schema validator result differ from Excel?

Browser libraries read stored workbook data but do not reproduce the complete Microsoft Excel calculation and rendering engine, VBA, Power Query, or every advanced workbook object.

Processing notes

AreaBehavior
PrivacyLocal browser processing
PreviewLimited rows and columns
SafetyCSV formula-prefix protection option

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