Read-only CSV checks, before the import fails
Understand the file before another tool guesses.
Check encoding facts, delimiter confidence, malformed rows, duplicate headers, blank values, and spreadsheet risks. Nothing is repaired or uploaded.
- Runs locally
- Never rewrites your file
- No account
- Up to 10 MB
Step 1
Choose one data file
- File size
- — Browser-reported bytes
- Encoding
- — Never guessed as a legacy codepage
- Newlines
- — Physical line endings
Choose a file first.
Health report
Review this file
Column profile
Completeness and exact uniqueness
Values remain strings. Nothing is trimmed or converted.
| Column | Blank | Unique | Uniqueness |
|---|
Findings
What may change downstream
| Severity | Finding | Reference | Count |
|---|