How to Use the CSV Header Fixer Tool
🔧 Open the CSV Header Fixer and follow along with this tutorial.
Open Tool →Steps
Step 1: Upload Your CSV
Click Upload CSV. The tool parses the file and immediately runs header diagnostics.
Step 2: Review Detected Issues
Any blank, duplicate, or whitespace-padded headers are listed with their column position and the nature of the issue. If no issues are found, a green confirmation is shown.
Step 3: Apply Auto-Fix
Click Auto-Fix All to apply the suggested corrections: blank headers become col_1, col_2, etc.; duplicate headers get a _2, _3 suffix; whitespace is trimmed.
Step 4: Edit Manually
If the auto-fix names are not suitable, click into any header field and type a better name. You can override any auto-fix suggestion.
Step 5: Preview the Output
Click Preview to verify the corrected header row and first data rows.
Step 6: Export the Fixed CSV
Click Export Fixed CSV. The output file contains the corrected headers with all original data rows preserved.
Privacy reminder: Processing is entirely local — your file never leaves your browser.