Flip CSV rows and columns — wide tables to long form for analysis. Pivot stubborn exports without Excel gymnastics — local transposing, free, no signup.
Content reviewed October 2026 · About Toolzum
Pivot CSV rows into summary tables — group, count, and sum without spreadsheets. Summarize 10k sales rows by region instantly — local pivoting, free, no signup.
Merge two CSV files on a shared key column — join related exports into one sheet. Combine two tables without spreadsheets — local merging, free, no signup.
Rename CSV headers in bulk with old:new mapping — standardize client exports fast. Fix 40 messy columns before import — local parsing, free, no signup.
Remove duplicate text lines with the deduplicator, preserving first-seen order — clean email lists and logs. Dedupe 10,000 rows without Excel gymnastics — local processing, free, no signup.
Clean messy CSVs — trim whitespace, fix encodings, deduplicate rows, standardize blanks. Make client exports analysis-ready — local processing, free, no signup.
Metrics-as-columns (Jan..Dec headers) transpose to date/value rows for charting. Time series almost always want long form.
First row becomes first column; corner cell labels the series. Verify after — ragged rows transpose messily.
Thousand-cell tables transpose instantly; million-cell sheets need script tools. Browsers handle moderate sizes best.
No — transposing runs locally in your browser. Data never leaves your device.
They pad with blanks to the longest row before flipping, so no data shifts columns. The Metrics demo (metric,Q1-Q4 across 3 rows) becomes a 5-row by 4-column table headed metric,Revenue,Cost,Profit.
CSV Merger
Merge two CSV files on a shared key column — join related exports into one sheet. Combine two tables without spreadsheets — local merging, free, no signup.
CSV Splitter
Split CSV data into equal parts with headers in every chunk. Break large pastes into smaller pieces — local splitting, free, no signup.