Important limitations
- Inspection only; no CSV repair
- First row is treated as the header; 256 MB file limit, duplicate checks on the first 500,000 rows, and up to 10,000 reported issues
- Does not guarantee compatibility with every importer
macOS
CSV Preflight
Check CSV structure, duplicates, and character issues before importing.
macOS 14+$14.99 · one-time purchaseEnglish & Japanese
Store information checked: 2026-10-26 · Check the store for current prices and regional availability.
A SMALL TOOL FOR A REAL TASK
Find common CSV problems before an import fails.
For people preparing data imports who want to review encoding and row structure first. Open or drop a file, inspect findings by row and column, and export an issue report.
What it does
- Inspect encoding, delimiters, quoting, and line endings
- Find header, column-count, duplicate-row, and hidden-character issues
- Apply optional uniqueness, required-value, character, and byte-length rules
- Export a CSV issue report
A LOOK INSIDE
Inside the app
Privacy characteristics
Selected CSV files are processed locally. No network requests, accounts, advertising, analytics, or tracking.
Read this app’s privacy policy ↗GOOD TO KNOW
Common questions
Does it repair CSV files?
No. CSV Preflight inspects files and exports reports. It does not automatically repair or rewrite the original CSV.
Which encodings are supported?
UTF-8 and BOM-marked UTF-16. Other encodings are reported as unsupported.
Do files leave my Mac?
Inspection is local. No account or cloud upload is needed.
Can it inspect Shift-JIS or other legacy regional encodings?
Version 1.0.0 supports UTF-8 and BOM-marked UTF-16, and reports other encodings as unsupported before import. To inspect row structure and column rules, export a UTF-8 or BOM-marked UTF-16 copy from the original tool.
Can I check specific columns for duplicates or byte-length limits?
Yes. You can apply optional per-column rules for required values, uniqueness, character count, and UTF-8 byte length.
Need a hand?
Tell us the app name, OS version, and what happened.