Keyword List Merger
Merge up to four keyword lists into a single clean list, with de-duplication, optional sorting and a source overlap report.
Your input
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Results
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About this tool
Keyword research rarely comes from one place. You end up with an export from a research tool, a list from a client, a set from your own analytics and something a colleague sent in a message. This merger combines up to four of them into one clean list, removes duplicates and tells you how much the sources overlapped — which is a useful signal in itself.
How it works
Each list is split on line breaks and trimmed. The combined set is optionally de-duplicated case-insensitively and optionally sorted alphabetically. Separately, the tool counts how many keywords appear in more than one source list, comparing each list's unique entries. High overlap suggests your sources agree; near-zero overlap suggests they are looking at different parts of the market.
- 1Paste each source into its own list box.
- 2Choose whether to deduplicate and sort.
- 3Generate to see the merged list and the overlap count.
- 4Export the result as TXT, CSV or JSON.
Example
Input
List 1: running shoes, trail shoes · List 2: running shoes, cycling shoes
Output
3 merged keywords · 1 appears in more than one list
When to use it
- Consolidating research from several tools before prioritising.
- Combining client-supplied terms with your own research.
- Checking whether two research sources agree with each other.
- Preparing one canonical list for a project after a discovery phase.
Tips
- Clean each source before merging so case differences do not hide duplicates.
- A very low overlap usually means one source is off-topic — check before merging.
- Keep the merged list as your single source of truth and archive the originals.
Limitations
Merging is textual, so the same idea phrased differently in two sources will not be recognised as overlap. The overlap count also treats a keyword appearing twice in one list as a single occurrence for that list, which is deliberate but worth knowing.
Frequently asked questions
- How many lists can I merge?
- Four at a time. For more, merge in rounds — the output of one merge becomes an input to the next.
- What does the overlap number mean?
- It counts keywords that appear in at least two of your source lists, which indicates how much your sources agree.
- Is order preserved?
- Yes, unless you enable sorting. Lists are appended in order and duplicates keep their first position.