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Local VLOOKUP (Joiner)

Join two large CSV files on a shared key column instantly without Excel freezing.

Drop your file here

or click to browse (Max 500MB)

Supported: .csv

Drop your file here

or click to browse (Max 500MB)

Supported: .csv

How VLOOKUP Joiner Works

●SQL JOIN Engine — Powered by DuckDB WebAssembly. Replaces Excel VLOOKUP with true relational JOIN.
●Column Name Conflicts — Duplicate column names between tables are auto-prefixed with lookup_.
●100% Local — No data leaves your browser. Files are processed entirely in-browser via WebAssembly.