Multirow CSV Header Flattener
Combine declared header levels into single field names with explicit blank-fill and collision policies.
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How to use Multirow CSV Header Flattener
Prepare a rectangular exported report for ordinary CSV consumers while keeping a mapping back to each original header cell. Blank cells can remain absent or inherit the earlier value on that same header row; this is an explicit policy rather than a guess about spreadsheet merges.
- Enter input, header levels, header path separator.
- Choose the settings for multirow csv header flattener, then run the tool.
- Review the result and any limitations before copying or downloading it.
Good to know
- 200,000 characters,100 columns,1–10 header rows and 5000 output records. Input must be rectangular.
- No workbook styles or merged-cell detection. Suffix mode makes duplicate names explicit; formula-like header/value prefixes are protected in CSV output.
- Processing is local. Output is limited to 1,000,000 text characters unless a stricter file limit is stated.
Common questions
Does forward fill infer actual merged spreadsheet cells?
No. It copies the prior nonblank value on each declared header row. Review the original/filled-level mapping before using the flattened field names.
Is this input sent to a server?
No. The application processes this input inside your browser tab and does not save it to persistent storage.
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