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Open any tool directly in your browser, or download its offline reference guide to keep handy — no internet needed once saved.

4 Powerful tools
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CSV Output format

Available Tools

"Download Guide" saves a self-contained offline HTML file
Free

Merge

SQL-style JOIN for CSV & Excel files

Combine two spreadsheets on a common key column. Choose inner, left, right or outer join, select which columns to include, and download the merged result — no VLOOKUP formulas needed.

  • 4 join modes — Inner, Left, Right and Outer.
  • Any key column — IDs, emails, product codes — any shared field.
  • Selective output — Keep only the columns you need.
  • Large file support — Handles tens of thousands of rows.
Open Merge Download Guide
Free

Compare

Colour-coded diff between two spreadsheet versions

Upload an old and a new version of a spreadsheet. Match rows on one or more key columns with exact, partial or fuzzy matching. Added, removed and changed cells are highlighted — download the full diff as CSV.

  • 3 match modes — Exact, Partial, Fuzzy.
  • Multi-column keys — Composite key support.
  • Cell-level diff — Old value struck-through red, new value green.
  • Status filter — Show only Added / Removed / Modified rows.
Open Compare Download Guide
Free

Deduplicate

Find and count duplicate rows instantly

Upload a CSV or Excel file and instantly group identical rows. Choose which columns define uniqueness, see a count badge on each group, filter to duplicates or uniques only, and download the clean result.

  • Group by any columns — All or selected columns.
  • Count per group — __count column shows occurrences.
  • Filter view — All / Duplicates only / Unique only.
  • 100% in-browser — Your data never leaves your device.
Open Deduplicate Download Guide
Free

Pivot

Transform rows into columns

Turn a tall Name / Month / Value layout into a wide pivot table in one click. Choose your row key, pivot column, value column, and how to aggregate duplicates.

  • Pick row key, pivot & value columns
  • Aggregate: sum, count, concat, first
  • Download wide CSV — instantly.
  • 100% in-browser — Your data never leaves your device.
Open Pivot Download Guide

Your data never leaves your device

All file processing — merging, comparing, deduplicating, pivoting — happens entirely in your browser tab. No bytes are sent to any server. Close the tab and everything is gone. GDPR-friendly by design.