Know what will break before you import.
Upload your Excel or CSV. ImportCheck highlights the exact cells that will cause problems - before your import fails.
This is what ImportCheck does
It scans your file and points directly to the cells that will break your 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 |
Hidden spaces
Looks identical, but imports differently.
| A | B | C | |
|---|---|---|---|
| # | Name | Status | |
| 2 | test@example.com | John | Active |
| 3 | test@example.com | John | Active |
| 4 | test@example.com | Jane | Active |
Duplicate header
Importers can’t map columns reliably.
| A | B | C | D | |
|---|---|---|---|---|
| # | ID | Status | ||
| 2 | 1 | john@example.com | john.alt@example.com | Active |
| 3 | 2 | jane@example.com | [empty] | Active |
| 4 | 3 | max@example.com | [empty] | Inactive |
And many more checks: missing headers, empty columns, mixed types, encoding issues, duplicate rows, …
See how it works →Problems ImportCheck catches automatically
The most common reasons imports fail - or quietly create wrong data.
Broken structure
- Missing or duplicate column names
- Rows with too many or too few values
- Completely empty columns
In plain words: The file shape doesn’t match what the importer expects.
Wrong or inconsistent data
- Invalid dates
- Mixed date formats
- Numbers mixed with text or TRUE/FALSE
In plain words: Values may look okay, but they won’t parse reliably.
Hidden issues you don’t see
- Empty cells where data is expected
- Extra spaces before/after values
- Duplicate rows
- Garbled characters (wrong CSV encoding)
In plain words: Everything looks fine - but the data isn’t clean.
Who this is for
If you ever upload Excel into another system, this is for you - no technical knowledge needed.
- • Ops / admin teams importing into ERP or CRM tools
- • Developers importing data into apps or APIs
- • Freelancers validating client spreadsheets
- • Anyone tired of “Import failed” with no explanation
Safe & simple
- • No signup required
- • Files processed securely
- • Files deleted automatically after validation
- • Works with .xlsx and .csv
Ready to validate your file?
Upload an Excel or CSV file and see what will break - before it costs you time.
Validate my file