Data & CSV

CSV side-by-side combiner

Combine tables by row position with strict or blank-padded alignment.

Your inputs

Original / left CSV

Up to 25 MB per file, 50,000 data rows, 200 columns and 2 million data cells. Fully blank rows and columns are ignored before row, column and cell limits are checked. Individual tools may have smaller result or chart limits.

Or choose a CSV file

Left separator

Updated / right CSV

Or choose a CSV file

Right separator

Unequal row counts

Results update as you type. Larger files run when you press Update result.

Processed on your device

Your result

LOCAL & PRIVATE

Your result will appear here.

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A clear answer. Here’s how.

Aligns first data row with first data row and so on, without matching keys. Requires equal row counts by default; padding mode retains the longer table. Right headings keep their name when free, otherwise receive a collision-safe Right. prefix and suffix. Original cells stay text; output is capped at 200 columns and 2 million cells.

See a worked example

Worked example

A fixed demonstration, separate from the values you enter above.

Original / left CSV

ID,Name
001,Ada
002,Sam

Left separator

Comma

Updated / right CSV

ID,Name
001,Ada
002,Samuel
003,Jo

Right separator

Comma

Unequal row counts

Pad missing rows with blanks

Example result

Example result
ID	Name	Right.ID.2	Right.Name.2
001	Ada	001	Ada
002	Sam	002	Samuel
		003	Jo

Rows are aligned by position, without key matching. Pad mode adds empty cells for missing rows.