List Union Dedupe
Combine lists and remove duplicates.
Merge and dedupe lists
This joins one or more lists and removes duplicates, keeping the first occurrence — the fast way to build a clean master list from several overlapping sources.
It is how you build one clean master list from several overlapping sources — combined mailing lists, merged tag sets — keeping each entry once in its first-seen order.
Exact matches only
Items differing by case or spacing count as distinct, so normalise first if needed. The dedupe runs in your browser. Your lists are merged on your device and never uploaded.
Frequently Asked Questions
What does this list union dedupe do?
Combine several lists into a clean unique union.
Can I use this with private work data?
Yes. The tool runs entirely in your browser, so pasted data is not uploaded, logged, or stored by Bushe.co.
What should I check before using the output?
Review the preview or output for delimiter issues, unexpected blank rows, and field names that may need cleanup before importing elsewhere.
Is this tool free?
Yes. It is free to use and does not require an account.
More free browser utilities for data cleanup, formatting, and developer workflows.