How it works
Upload → Scan → Fix → Import with confidence.
Four simple steps
No setup. No complicated configuration. Just upload and fix what’s highlighted.
Upload your file
Drag & drop your Excel or CSV. ImportCheck reads it the same way importers do.
Scan for common import killers
We run deterministic checks for structure issues and data problems that frequently break imports.
See the exact cell(s) to fix
Instead of a wall of errors, you get an Excel-like preview with only the problematic cells highlighted.
Fix in Excel and import confidently
Make the small edits in your sheet, re-upload if needed, then import with confidence.
What you’ll see
ImportCheck points you directly to the problem - like a screenshot of Excel with a marker.
Example: invalid date
A date like 2026-13-40 looks “date-ish” but is invalid - many importers reject it or parse it incorrectly.
Start here
Excel row 3, column “Date”. Fix that cell and re-import.
Invalid date
Computers reject dates like this.
| A | B | C | |
|---|---|---|---|
| # | ID | Date | Amount |
| 2 | 1 | 2026-13-40 | 100 |
| 3 | 2 | 2026-01-14 | 50 |
| 4 | 3 | 2026-02-01 | 25 |
Only the problematic cells are highlighted - everything else stays calm.
Safe, fast, and predictable
Built for real work - no surprises.
Privacy-first
No signup required. Files are processed securely and deleted automatically after validation.
Fast results
Most files validate in seconds - so you can fix issues before you even open your importer.
Clear checks
Deterministic rules catch common import problems (structure, dates, types, whitespace, duplicates).
Ready to validate your file?
Upload an Excel or CSV file and see what will break - before it costs you time.
Validate my file