CSV Merge, Split, Clean & Dedupe
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How to use CSV Tools
- Choose your file (or drop it onto the page).
- Adjust the options shown.
- Select the action button and wait for it to finish.
- Review the result, then download it.
What to expect
A new file is created. Your original file is never modified.
- Processing happens in your browser, so very large files depend on your device's memory.
Frequently asked questions
How do I merge CSV files with different columns?
Choose Merge and match by header name. Missing values are left empty and you are told how many files differed.
How does duplicate removal compare rows?
It ignores case and surrounding spaces, using the key columns you choose (or the whole row).
Is my CSV files uploaded anywhere?
No. The CSV files is read and processed by JavaScript in your browser. Only the website's own code and assets are downloaded.
Do I need to create an account?
No. Every tool works without sign-up or login.
Is it safe for confidential documents?
Files are processed locally in your browser and never uploaded. Close the tab or select Clear to release them from memory.