CSV Diff / Compare
Compare two CSVs by a key column and report added, removed and changed rows.
About CSV Diff / Compare
CSV Diff compares two CSV files by a key column and reports exactly which rows were added, removed or changed — ideal for diffing exports, price lists and database snapshots without committing them to git.
How to use CSV Diff / Compare
- 1Paste or type your data into the input box above (a sample is pre-filled so you can try it instantly).
- 2Adjust any options on offer — delimiter, columns, formatting and so on — to match what you need.
- 3Comparing happens instantly as you type; review the result in the output panel.
- 4Click Copy to grab the output or Download to save it as a file — CSV Diff / Compare keeps everything on your device.
Why use CSV Diff / Compare?
- ✓Comparing yesterday's and today's data export
- ✓Checking what changed in a price or inventory list
- ✓Auditing differences between two database dumps
- ✓100% free with no sign-up, no watermark and no usage limits
- ✓Runs entirely in your browser — your data is never uploaded or stored
- ✓Works offline once loaded, with instant results and one-click copy or download
Frequently asked questions
How does it match rows?+
Rows are matched by a key column you choose (such as id). Keys only in the new file are added, keys only in the old file are removed, and keys in both with different values are changed.
Does it need the files in the same order?+
No — matching is by key, not row position, so reordered files compare correctly.
Is it free to use?+
Yes — it is completely free with no sign-up, no account and no usage limits. There is no watermark and no paywall, so you can process as many files as you like.
Is my data private and secure?+
Yes. This tool runs entirely in your browser using client-side JavaScript — your data is never uploaded to a server, stored or logged. Once the page has loaded you can even use it offline, which makes it safe for confidential or proprietary files.
Related converters & parsers
Related Data tools
Text to EPUB Converter
Turn plain text or a manuscript into a valid EPUB ebook — chapters, metadata and all — entirely in your browser.
● LiveMarkdown to EPUB Converter
Convert a Markdown manuscript into an EPUB 3 ebook, splitting chapters on level-1 headings. No upload.
● LiveHTML to EPUB Converter
Build a clean EPUB ebook from HTML articles or web-page exports, with optional chapter splitting.
● Live