convert-csv.com logo convert-csv.com

CSV Viewer & Editor

View and edit CSV or Excel files in a fast virtualized grid handles large files smoothly.

100% Secure - your files are processed in your browser and never sent to a server.
Drop your file hereor click to browseSupports CSV, TSV, or TXT files (.csv, .tsv, .txt) (Max 100MB)

The CSV Viewer and Editor provides a spreadsheet-like interface for viewing and editing CSV and Excel files directly in your browser. Unlike basic text editors that display raw CSV, this tool renders data in a virtualized grid that handles large files smoothly. The virtualized rendering means only the visible rows are drawn in the DOM, allowing the viewer to display files with hundreds of thousands of rows without performance degradation. You can sort columns by clicking headers, filter rows using text search, and edit cell values directly in the grid. The editor supports both CSV and Excel (XLSX) file formats, auto-detecting the input type based on the file extension. Changes made in the editor can be exported back to CSV or Excel format. All file processing happens in your browser, making it safe for viewing sensitive data like financial records, customer databases, or proprietary datasets without uploading them to external services.

How to use the CSV Viewer & Editor tool

  1. Load your data: Drag and drop your CSV or Excel file, choose a file from your file explorer, or paste CSV data directly into the paste area.
  2. View and edit: Browse your data in the interactive virtualized grid. Click any cell to edit it directly, add new rows or columns as needed.
  3. Export results: Download the edited CSV file when you are satisfied with your changes.

Frequently asked questions

What is virtualized rendering and why does it matter?
Virtualized rendering means only the rows visible on screen are drawn in the DOM. This allows the viewer to handle files with 100,000+ rows smoothly, as the browser only renders a small fraction of the data at any time.
Can I edit cells directly in the viewer?
Yes. Click any cell to edit its value. Changes are reflected immediately in the grid, and you can export the modified data as CSV or Excel.
Does the viewer support Excel files as well as CSV?
Yes. The tool auto-detects CSV and Excel (XLSX) files based on the file extension. Excel files are parsed using SheetJS and displayed in the same grid interface.
Can I sort and filter the data?
Yes. Click column headers to sort ascending or descending. Use the search box to filter rows by text content. Multiple sort and filter operations can be combined.
Is there a file size limit?
The viewer handles files up to 100 MB. Performance depends on your device, but the virtualized rendering ensures smooth scrolling even with very large datasets.

Related tools