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Compare CSV files.
Right in your browser.

See every changed row, resolve conflicts cell by cell, and export a clean merge — 50,000 rows in under a second. Your data never leaves your browser.

Start comparing — free
Running locally0 bytesuploadedCSV · JSON
Start here

Drop your two files.

CSV or JSON. Drag & drop, click to browse, or load sample data to explore the interface first.

Add two files to compare.

The toolkit

Three tools, one tab.

Everything for the CSV workflow — compare two files, view and clean a single one, or join two on a shared key. All in the browser, nothing uploaded.

COMPARE

Compare two CSVs

Diff two versions of a file: see modified, added, and removed rows, resolve conflicts cell by cell, and export a clean merge.
VIEW

View a CSV

Open a single CSV or JSON file as a fast, searchable, paginated table. Sort, filter, clean, and format without Excel.
JOIN

Join CSV files

Combine two CSV files into one by matching rows on a shared key — the browser alternative to a VLOOKUP or a SQL join.
What you get

Diff, view, and clean — in one tab.

Built for the full CSV workflow: compare two versions and ship a clean merge, or open a single file and clean it up with color rules, fill blanks, bulk replace, and column formats.

How it works

Three steps, zero setup.

Blog

Guides & insights.

Practical walkthroughs on comparing CSV files online — from picking the right match key to validating data migrations and using AI to summarise what changed.

FAQ

Common questions.