East
east.csv
1001East
1004East
No upload — processing stays in your browser
Work with CSV files safely in your browser.
Split, merge, convert, filter, sort, and summarize CSV files without sending them outside your device.
- Free
- Up to 50 MiB
- LocaCSV Pro · Windows 11 x64 desktop · 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.
Inspect a CSV
Browse every row and column of a CSV up to 50 MiB in your browser, 100 rows at a time, and check its text encoding, separator, BOM, and column count.
View tool detailsCompare CSV files
Compare two files totaling up to 50 MiB by a shared key, then download a CSV summary listing each change, its key, and the changed column numbers.
View tool detailsLearn how to repair CSV problems
Find uneven rows, blank lines, exact duplicates, and broken quotes, then apply only the repairs you select to a new CSV.
View tool detailsSplit by rows or size
Split a CSV by a fixed number of data rows or a target file size. Review encoding and delimiter settings, then create up to 100 outputs from a 50 MiB file entirely in your browser.
View tool detailsSplit by value
Choose one column and create a separate CSV for each value, such as a store, region, or owner. Up to 100 output files are created entirely 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 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 detailsConvert encoding & format
Convert CSV to multiple encodings or JSON, and turn a list of JSON objects into CSV. Choose UTF-8 with or without a BOM. Files never leave your browser.
View tool detailsFilter rows
Combine column comparisons in nested AND/OR groups to create a CSV containing only the rows you need. Processing stays 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 & summarize
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