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Free Online CSV Editor

Edit CSV files directly in your browser with a side-by-side editor and live table view. Format, validate, and download your CSV instantly.

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A CSV editor lets you open, read, modify, and save CSV files without opening a spreadsheet application. JSON Viewer Pro's online CSV editor shows your raw CSV in the editor panel on the left and the resulting table view on the right simultaneously, so you can see the effect of your edits immediately. Change a value in the editor and the table updates instantly.

The CSV editor uses Monaco Editor — the same engine that powers Visual Studio Code — for the raw text input. You get full editing features including multi-cursor editing, find and replace, and column selection. The Format button normalises line endings, fixes inconsistent quoting, and removes extra whitespace. The Minify button trims all cell values.

All CSV editing happens locally in your browser. Your CSV data is never uploaded to any server, making the editor safe for editing CSV files containing personal data, financial records, or confidential business information.

Key Features

  • ✓ Side-by-side editor and table view
  • ✓ Live table preview as you edit
  • ✓ Format and clean CSV in one click
  • ✓ CSV validation with error messages
  • ✓ Download edited CSV file
  • ✓ Column sorting and row filtering
  • ✓ Show/hide columns
  • ✓ No data sent to any server

Common Use Cases

  • → Edit CSV data files online
  • → Fix CSV formatting errors
  • → Clean up exported CSV files
  • → Correct data entry mistakes in CSV
  • → Edit CSV before importing to databases
  • → Remove unwanted columns
  • → Update values in CSV records
  • → Prepare CSV for data pipelines

Frequently Asked Questions

Can I edit individual cells?

You can edit the raw CSV text in the editor panel. The table view updates instantly to show your changes.

What does Format do?

Format normalises line endings, ensures consistent quoting for values containing commas or quotes, and produces clean RFC 4180 CSV.

Can I upload a CSV file?

Yes. Use the Open button in the toolbar or drag and drop a CSV file onto the editor.

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JSON Viewer Pro — all processing runs locally in your browser. Your data is never sent to any server. Free to use, no account required.Privacy Policy·Contact