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Free tool · live
Turn a messy spreadsheet into a clean HubSpot import.
Upload a list, map the columns, and download an import-ready file — headers renamed, whitespace trimmed, bad and duplicate emails pulled aside. Your file never leaves this browser tab.
What this tool can access
Nothing. The List Prepper runs entirely in your browser. Your file is read locally, cleaned locally, and downloaded locally — no API key, no upload, no data leaves this page.
- 1Upload
- 2Map columns
- 3Clean & export
Upload your list
A CSV or Excel file with a header row. Whatever the columns are called, you’ll map them in the next step.
Drop your file here or click to browse
Accepts .csv, .xlsx, .xls
Free tool, provided as-is — results are a starting point, not an audit. Double-check anything before you act on it. By running it you agree to the Terms of Use.