What this remove-duplicates tool does
This free tool takes any list — one item per line, like a CSV column of emails, URLs, SKUs, or names — and removes duplicate entries. Matching is case-insensitive and ignores leading/trailing whitespace, so [email protected], [email protected], and [email protected] all collapse into one. You get a count of how many duplicates were removed so you know exactly what happened.
How to remove duplicates
- Paste your list or CSV column into the left box, one value per line.
- The de-duplicated list appears on the right, with a live count of unique vs removed rows.
- Click Copy to grab the clean list.
Common uses
Cleaning email lists before an outreach campaign so you don't message anyone twice.
De-duplicating lead exports merged from multiple sources.
Tidying URL or keyword lists for SEO and research.
Privacy
The entire operation happens in your browser. Nothing is uploaded — safe for customer and lead data.
When to automate
Cleaning one list by hand is quick. Cleaning data *every time it arrives* — deduping leads as they come in from forms, ads, and imports, then merging them into one master sheet — is what an Autonoly agent handles automatically, so your CRM stays clean without anyone touching it.