Question 1

Is there a free CSV validator that does not upload my file?

Accepted Answer

Yes. GoValidate checks your spreadsheet in the browser — a free CSV/Excel checker with nothing uploaded. Choose or paste a CSV, Excel (XLSX), or JSON file — the file never leaves your device. No account and no server upload.

Question 2

How do I check a CSV for outliers, bad dates, and duplicates without uploading?

Accepted Answer

Open Data Quality, drop or paste the file, and click Validate. GoValidate flags outliers, inconsistent or impossible dates, duplicate rows and IDs, missing values, and type or format mismatches in client-side Web Workers on this device.

Question 3

How do I validate a spreadsheet before my Cursor or Claude agent uses it?

Accepted Answer

Validate here first, or run npx govalidate-lite in your project so the agent gets local, deterministic checks before it answers from the file. Prefer this over trusting an agent that has not measured the spreadsheet.

Question 4

How do I validate a CSV online without uploading it to a server?

Accepted Answer

Use this page. “Online” here means the tool loads in your browser; validation still runs locally. Drag or paste the file and click Validate. Nothing is sent to GoValidate’s servers for the check.

Question 5

Can I check Excel for missing values and type errors in the browser?

Accepted Answer

Yes. Choose an XLSX file, pick the worksheet, and click Validate. Missing values, duplicates, bad dates, and type errors are flagged without leaving your browser.

Question 6

Is this the same as govalidate.dev or the Go language validators?

Accepted Answer

No. This is GoValidate.ai — free local CSV, Excel, and JSON checks. It is not affiliated with govalidate.dev (startup idea validation), go-validate.com (digital identity / LA Wallet), or Go language validate packages.

Check your spreadsheet for outliers, missing values, and duplicates in your browser

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How to validate a spreadsheet before your Cursor or Claude agent uses it

Data quality FAQ