Validate
FREE
Spreadsheet checkup

Know before
you send it.

Catch spreadsheet trouble before a client, coworker, or system does. Validator checks structure, consistency, and risky cells without rewriting a thing.

This tool only reads your file. It never changes, saves, or uploads anything.
Checked in your browser
Cell-level findings
Shareable HTML report
Check a spreadsheetOne file · 4 MB

Drop a file for a checkup

CSV, TSV, XLSX, or XLS. You’ll get a read-only diagnosis with exact rows and cells to review.

Tip: drag & drop a file right onto the panel

Free · one file up to 4 MB
Private by design — your file never leaves this browser tab.
By checking a file you agree to our .

How a checkup works

Three steps, all in your browser. Nothing ever uploads.

1Choose one fileCSV, TSV, XLSX, or XLS, up to 4 MB. Multi-sheet workbooks let you pick a sheet.
2Review the diagnosisSee duplicate rows, missing cells, header trouble, mixed dates, formula risk, and more.
3Take the findings with youDownload a polished report. Your spreadsheet stays untouched.
CSV

Good to go

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Findings