Check a selected column against US, Canadian, UK, Australian, or custom postal-code rules and export an annotated workbook. Everything runs locally in your browser.
Postal codes are checked as text so leading zeroes are retained. Each row is labeled Valid, Invalid, or Blank; no value is silently deleted.
The original file is never overwritten, and no file contents are uploaded by this page.
XLSX, XLS, CSV, and TSV are supported. Validation checks syntax only and does not confirm that an address or postal code exists.
| Format | Use |
|---|---|
| XLSX / XLS | Workbook input |
| CSV / TSV | Delimited table input or output |
| JSON | Optional result export |
No. Processing happens locally in your browser. The page does not send workbook contents to a server.
No. The tool creates a separate download, so your selected source file remains unchanged.
Formula handling depends on the operation. Formula-inspection tools retain formula text, while rebuilt data outputs may not preserve every Excel feature.
It checks file size and limits the on-page preview. Very large or complex workbooks may still exceed the browser’s available memory.
Browser spreadsheet libraries cannot preserve every advanced Excel object. Open the output and verify important values, formats, and business rules before relying on it.
| Stage | Behavior |
|---|---|
| Input | Validated locally |
| Preview | Row-limited |
| Output | New downloadable file |