East
east.csv
1001East
1004East
No upload — processing stays in your browser
Work with CSV files safely in your browser.
Split, merge, convert, transform, and aggregate CSV files without sending them outside your device.
- Free
- Up to 50 MiB
- Pro in preparation
CSV processing stays in your browserYour files are not uploaded to a server.
How CSV splitting works
Rows are routed into three CSV files by the value in the Region column.
Routing rows to their output files
Input CSV
orders.csv
OrderRegion
1001East
1002West
1003North
1004East
1005West
1006North
Output CSVs
West
west.csv
1002West
1005West
North
north.csv
1003North
1006North
Choose a tool
Review the usage notes, then open the processing screen directly.
Split
Choose a column to create one CSV per value. Auto-detect UTF-8 or Shift_JIS input, or select CP949, Big5, or GB18030 manually. Choose any of the five encodings independently for output. Files up to 50 MiB stay in your browser.
View tool detailsMerge vertically
Stack CSV files with the same columns—such as daily, monthly, or store exports—in the order selected. Headers are checked first, and the result can be saved only when input and output row counts match. Everything is processed in your browser.
View tool detailsConvert encoding & format
Convert and save CSV files as UTF-8, Shift_JIS, CP949, Big5, GB18030, or JSON. File contents never leave your browser.
View tool detailsJoin by key
Select a shared column, such as a product code or employee ID, to combine related fields from two CSV files into one row. Both files stay in your browser.
View tool detailsFilter rows
Choose a column, comparison, and value to create a CSV containing only the rows you need. Processing happens entirely in your browser.
View tool detailsSelect columns
Choose the columns to keep and arrange them in the order you want to create a cleaner CSV. Your file is processed only in your browser.
View tool detailsRemove duplicates
Detect duplicates using all columns or selected columns and keep the first matching row. Your CSV never leaves your browser.
View tool detailsSort rows
Treat a column as text or numbers and sort it in ascending or descending order. Rows with equal values retain their original order, and processing stays in your browser.
View tool detailsGroup & aggregate
Group rows by store, department, or another field, then export counts, sums, averages, minimums, and maximums as a new CSV. All processing stays in your browser.
View tool details