CSV Editor (Free • Private • In-Browser)
Edit massive CSV files directly in your browser — clean rows, filter or dedupe data, then export to CSV, Parquet, or JSON with zero uploads. Everything stays on your device for true privacy.
Drag and drop your CSV file hereor click to browse
CSV files up to 300MB
Don't have a CSV file?
Quick start
- 1
Open your CSV
Drop a CSV file, paste rows, or load the sample dataset to start editing instantly.
- 2
Tidy and explore
Sort, filter, deduplicate, and clean columns using the toolbar and context actions.
- 3
Edit cells in place
Click any cell to update values, add rows, or adjust headers with keyboard shortcuts.
- 4
Export your results
Download the edited table as CSV, Parquet, or JSON — data never leaves your browser.
Data stays on your device
All processing runs locally in your browser. Nothing is sent to any server.
Our CSV editor uses in-browser parsing to let you open, explore, and edit CSV files without uploading anything. Sort, filter, deduplicate, and clean columns, then export to CSV, Parquet, or JSON — all without leaving your browser.
~300 MB
Max file size
0 bytes
Data transmitted
3 supported
Export formats
Edit CSV Online
Make changes to your CSV files directly in your browser with our responsive table editor.
User-Friendly Interface
Filter, sort, add rows, and edit cells with our intuitive interface designed for ease of use.
Free & Secure
No registration required. All processing happens in your browser - your data never leaves your device.
No Installation Required
Use our CSV editor directly in your web browser, no software installation needed.
Is the CSV editor private?
Yes. The editor runs 100% in your browser using WebAssembly; no data ever leaves your device or touches our servers.
What is the maximum file size I can load?
You can work with CSV files up to 300 MB. Larger datasets load quickly thanks to streaming parsing in the browser.
Does the CSV editor work offline?
After the page loads, you can continue editing offline because every operation happens locally.
How do I use the CSV editor?
Drop a CSV file, explore or edit rows with the spreadsheet view, then export to CSV, Parquet, or JSON when you're done.