Drop in a list. Nothing changes until you download it.
List Cleaner
Clean a CSV or Excel list: trim spaces, normalize case and emails, remove duplicates by the columns you choose, and filter by date or text. See what was removed and why, and export kept and removed rows as CSV.
Good to know
- Every removed row is kept in its own export, with the reason.
- Duplicates are matched on the normalized values of the columns you choose, and the first row wins.
- Your original file is never changed.
Your files stay on your machine
This tool runs entirely inside your browser tab. Nothing is uploaded, stored, or sent to a server — close the tab and every trace is gone.
These are the free ones — see the full suiteHow big a file can it take?
There is no upload, so there is no upload limit — but the work happens in this tab, which means your browser’s memory is the budget. Nothing here will refuse a file for being large; a big enough one simply gets slow and, eventually, reloads the tab. The figures below are rules of thumb on a desktop browser, not enforced caps. On a phone or tablet, expect a good deal less.
- Lists are read to at most 50,000 rows, and the tool says when rows were left out.
- Each change recalculates the whole list, so large lists take a moment.
Password-protected PDFs are declined whatever their size — unlock the file first. If a run does die on a long document, splitting it into volumes and working through them one at a time is the reliable way round it.