Key capabilities
- Parse and append up to 50 local spreadsheet files
- Run Left, Inner, and Full Outer joins
- Control duplicate keys, empty keys, and column collisions
- Limit output growth and escape CSV formula-like text
Excel & CSV Merge / Join
Merge Excel, CSV, and TSV sheets with union, intersection, or strict headers, or run Left, Inner, and Full joins with conflict controls and local exports.
Workbooks are parsed and merged in a browser worker. File names, sheet names, columns, and cells are never uploaded.
Files and worksheets
Merge rules
Result preview
Choose files and merge rules to begin.
About Excel & CSV Merge / Join
Append spreadsheets or join them by a business key, entirely in your browser. Merge Excel, CSV, and TSV sheets with union, intersection, or strict headers, or run Left, Inner, and Full joins with conflict controls and local exports. The core workflow is designed to run in your current browser.
Useful for
- Combine recurring reports from months, stores, or teams
- Enrich data using order numbers, user IDs, or other keys
- Inspect matched and unmatched records across sources
Frequently asked questions
Is Excel & CSV Merge / Join free to use online?
Yes. Excel & CSV Merge / Join opens in a modern browser and does not require desktop software installation.
What is Excel & CSV Merge / Join useful for?
Common use cases include Combine recurring reports from months, stores, or teams; Enrich data using order numbers, user IDs, or other keys.
Is my input or file uploaded?
The core processing workflow is designed to run locally in the browser. Key capabilities include Parse and append up to 50 local spreadsheet files, Run Left, Inner, and Full Outer joins, Control duplicate keys, empty keys, and column collisions; account, comments, and anonymous analytics may still create normal site requests.
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