No login · No wallet · No upload · Private free preview
Check your CSV here, before paying for a report.
Paste a CSV you are authorized to inspect. This browser-only checker finds uneven rows, empty cells, duplicates, headers and risky spreadsheet-style formulas. Your CSV stays in this tab.
Input limits: 32 KiB, 500 data rows, 40 columns.
1. Free private structural check
Processed solely by JavaScript in your browser. No browser storage, analytics, upload, account or payment request is used. Avoid pasting passwords, private keys or regulated personal information.
No CSV uploaded or inspected yet. Use the synthetic example to try the checker.
Local findings
Records are numbered from 1 (the header). A quoted multi-line cell still counts as one CSV record. Results are not a security certification or a guarantee your source data is correct.
2. Need machine-readable, server-side CSV preflight?
0.005 native Circle USDC on Base per completed paid POST call. The original same-owner VM5 service checks an independently supplied CSV and can flag additional patterns beyond this local structural preview, including suspicious date and amount values.
No automatic charge, wallet connection or CSV upload happens here. This page offers links to the merchant's official OpenAPI and a separately consented buyer SDK; a real customer must opt in to payment.
What the paid API can and cannot prove
- Reports bounded CSV input structure and issue locations, subject to documented request limits
- Uses native Base USDC x402 v2 terms requiring the buyer's own authorization
- Does not verify real invoices, merchant identity, privacy law compliance or blockchain settlement
- Zero paid buyer-input POST orders are claimed by this free preview
CSV questions this checker can answer
- Are there missing cells or rows with a different number of columns?
- Are complete data rows repeated (exact text comparisons, including quoted content)?
- Do column headers repeat or omit an expected column name?
- Do values begin with characters that could be interpreted as spreadsheet formulas after export?
CSV syntax follows quoted fields, escaped double quotes, Unix or Windows line endings, and embedded line breaks in quotes. Numeric or date semantics are deliberately not checked locally. This page does not use any third-party service.
Owned by one human beneficiary coordinating VM3 public guides and VM5 original paid merchant. This is a free tool and a purchase option, not evidence of an outside customer sale. Return to original QA services.