# Merge Two Contact Lists and Remove Duplicates | Dedupely

> Combine two CSV files into one list. Columns line up by name and the overlap is removed on email or any columns you choose. Free and in your browser.

- URL: https://dedupe.ly/pt/tools/list-merger
- Section: tools
- Site index: https://dedupe.ly/llms.txt
- Any page: append `.md` to its URL for this plain-text form

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## Merge two contact lists into one

Two files in and one deduped list out.
[Use in Claude](https://claude.ai/customize/connectors?modal=add-custom-connector&connectorName=Dedupely%20List%20merger&connectorUrl=https%3A%2F%2Fdedupe.ly%2Ftools%2Fmcp)
List A
CSV file
Or paste rows here
First row is a header
List B
CSV file
Or paste rows here
First row is a header
Run
Free for files up to 2,000 rows and 10 runs a day.
[Sign up for Dedupely to go further.](https://v2.app.dedupe.ly/signup)

### Combine lists without the overlap

Two exports share half their contacts. Pasting them together doubles those people. Every send after that goes out twice.
**This tool lines up the columns and keeps one row per contact.**

### Merge where the lists came from

The two lists came from two systems. Marketing has one copy and sales has another. The spreadsheet fix lasts until the next sync.
**Dedupely merges the duplicates inside the CRM and keeps new ones from settling in.**

### Use it from a script or an AI agent

[Use in Claude](https://claude.ai/customize/connectors?modal=add-custom-connector&connectorName=Dedupely%20List%20merger&connectorUrl=https%3A%2F%2Fdedupe.ly%2Ftools%2Fmcp)
POST https://dedupe.ly/tools/api/list-merger
{ "csvA": "Email,Name\n...", "csvB": "Email,Phone\n...", "keyColumns": ["Email"] }
MCP https://dedupe.ly/tools/mcp (tool: merge_lists)
Docs https://dedupe.ly/tools/api/openapi.json
[OpenAPI document](https://dedupe.ly/tools/api/openapi.json) ·
[API index](https://dedupe.ly/tools/api) ·
[llms.txt](https://dedupe.ly/llms.txt)

### More free tools

[CSV dedupe](https://dedupe.ly/tools/csv-dedupe)
[Name splitter](https://dedupe.ly/tools/name-splitter)
[Email normalizer](https://dedupe.ly/tools/email-normalizer)
[List merger](https://dedupe.ly/tools/list-merger)
[Domain extractor](https://dedupe.ly/tools/domain-extractor)
[Company normalizer](https://dedupe.ly/tools/company-normalizer)
[Test data generator](https://dedupe.ly/tools/test-data-generator)

### Get started for free

20 free trial merges and as much free support as you need to get your duplicates under control.
[Talk to sales](https://meetings.dedupe.ly/meetings/hampus-isaksson/dedupely-zoom-schedule)[Try for free](https://v2.app.dedupe.ly/signup)
[Or sign up with Google](https://v2.app.dedupe.ly/signup/google)
Running CRM cleanup for clients? [See the Partner Program](https://dedupe.ly/become-a-partner)
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