Transforming wide tables (one column per time period) into long format (one row per observation).

Can I rename the variable and value columns?

Yes — enter custom names for the output variable and value columns.

No. Everything runs locally in your browser.

Process files up to the browser memory limit.

Is this the same as pandas melt?

Yes — it is the exact equivalent of pandas.melt().

Transform wide CSV tables to long format. Convert column headers into row values. Processed entirely in your browser for 100%

Your files never leave your device. Processed locally. 100% private.

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Complete your task perfectly in just three straightforward steps.

Drop your wide-format CSV file.

Choose which columns are identifiers and which are values to melt.

Download the long-format CSV.

Everything you need to know about the Unpivot / Melt.

Continue working with our suite of free data utilities.

Filter CSV rows by conditions on any column. Supports AND/OR logic. The safest way to process sensitive data with zero-upload

Sort CSV rows by one or more columns in ascending or descending order. Fast, private, and secure browser-based tool with no s

Choose which columns to keep. Drag to reorder the output. Securely process files in your browser memory with zero data transf