Free Online CSV Editor
To edit a CSV file online, use Large CSV Viewer — a free online CSV editor. Double-click any cell to edit it inline, use Ctrl+H for find and replace across all columns, and export your changes as CSV, JSON, or Excel. Full undo/redo is supported with Ctrl+Z.
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Large CSV Viewer doubles as a full CSV editor. Double-click any cell to edit it inline, use find-and-replace across the entire dataset, and export your updated file — all without leaving your browser.
Key features
- Inline cell editing with a single double-click
- Full undo/redo history (Ctrl+Z / Ctrl+Shift+Z)
- Find and replace across all columns or a specific column
- Export the edited dataset as CSV, JSON, or Excel
How it works
- Upload your CSV. Open any CSV file in the viewer — any file size, no account required.
- Edit cells inline. Double-click any cell to enter edit mode. Type your new value and press Enter to confirm, or Escape to cancel. Undo with Ctrl+Z.
- Use Find & Replace for bulk edits. Press Ctrl+H to open Find & Replace. Replace text across all columns or a specific one, with optional regex and case-matching support.
Frequently asked questions
Are my edits saved automatically?
Edits are persisted to the server-side session in real time. Use the Export option in the File menu to download the updated file to your computer.
How many cells can I edit?
There is no limit on the number of cells you can edit. Use Find & Replace to bulk-update thousands of cells at once.
Can I undo a bulk find and replace?
Yes. Bulk replacements are tracked in the undo history. Press Ctrl+Z to reverse the entire replace operation in one step.
Can I add or delete rows and columns?
Currently, the editor supports cell-level editing and find & replace. Row and column insertion/deletion is on the roadmap.
What export formats are available after editing?
After editing, you can export your dataset as CSV, JSON, or Excel (XLSX) directly from the File menu.