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Build a clean export (select columns, combine files, summarize) — so the version you share is consistent and repeatable.

Input
Upload 1+ files (CSV/TSV/XLSX/XLS/TXT-delimited)
Loaded:none
Safety: your file is read locally in your browser. Use Masker if you need to share samples.
TXT works when it’s actually CSV/TSV style (header row + delimiter).
Export
Choose format + include a summary
Rows: Cols: Hidden cols: 0 Dropped rows: 0
adds a summary sheet (XLSX) or a separate text report (CSV)
helps Excel open non-English text correctly
Everything runs locally in your browser (no server upload required).
1) Column selection
Hide columns you don’t want to export
2) Rename & reorder
Optional: rename headers and control final column order
Reorder affects export only. Preview remains stable.
3) Rows & quality
Optional: drop blank rows and dedupe by keys
remove rows where every exported cell is empty
keep first occurrence and remove duplicates by keys
Dedupe keys (optional)
If no keys are selected, dedupe uses the full exported row.
Preview
First N rows of what will be exported
Summary
Missing values + quick numeric stats
Load files, then build export to generate summary.
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