Compare Files

Compare two CSV files and highlight the differences

File A

File B

Diff Output

Paste or upload two files to compare...

How to Use This Tool

This tool compares two files line by line and shows a color-coded diff of the differences.

Load your files — Paste or upload your original file into File A and the modified file into File B. Or click “Load sample” to try it out.
View the diff — Added lines appear in green with a + prefix. Removed lines appear in red with a - prefix. Unchanged lines have no highlight.
Copy or save — Copy the diff to your clipboard or save it as a .diff file.

FAQ

4 questions

Does this tool upload my data?

No. It runs entirely in your browser using JavaScript. Your CSV data is never sent to a server.

How does the comparison work?

It performs a line-by-line text diff, similar to git diff. Added lines are shown in green, removed lines in red, and unchanged lines have no highlight.

Can I compare non-CSV files?

Yes. Since the diff is text-based, you can compare any plain-text files — CSV, TSV, JSON, or raw text.

What do the + and - markers mean?

A + marks a line that was added in File B. A - marks a line that was removed from File A. Lines with no marker are unchanged.

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Delete rows that are completely empty

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Rearrange the column order in your CSV

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Quick count of rows, columns, and empty cells

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Pick a random sample of rows from your CSV

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Add a new column with a default value to your CSV

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Count the number of non-empty values in each column

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Extract the first N rows from your CSV

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Search for values in your CSV and replace them

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Extract the last N rows from your CSV

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Get count, mean, min, max, and percentiles for numeric columns

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Extract a range of rows by start and end position

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Split one column into two columns by a delimiter

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Remove leading and trailing spaces from all cells

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Add a sequential row number column to your CSV

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Create a copy of an existing column

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