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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)

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

Is it safe to use CSV Viewer & Editor with sensitive or confidential data?
Yes, completely. All processing done by CSV Viewer & Editor runs 100% client-side inside your local web browser using a background Web Worker thread. Your data is never uploaded, transmitted, or stored on any server, not even temporarily.
What is the maximum file size CSV Viewer & Editor can handle?
CSV Viewer & Editor supports files up to 100 MB. Because all parsing happens inside your browser's memory rather than on a server, performance scales with your computer's available RAM. The Web Worker architecture keeps the UI fully responsive even during heavy processing.
How does CSV Viewer & Editor process my data without uploading it?
CSV Viewer & Editor uses modern browser File and Blob APIs alongside battle-tested open-source libraries (such as PapaParse and SheetJS) bundled directly into the page. When you load a file or paste data, the browser reads it into local memory and the conversion runs entirely inside a sandboxed Web Worker thread. No network call is ever made.
Do I need to install anything to use CSV Viewer & Editor?
No installation, browser extension, or plugin is required. CSV Viewer & Editor runs as a standard web page inside any modern browser. Simply open it, load your data, and download the output. Nothing to install and nothing to uninstall.
Does CSV Viewer & Editor work offline after the page has loaded?
Yes. Once CSV Viewer & Editor has finished loading in your browser, the conversion engine itself requires no active internet connection. You can disconnect from the network and continue converting files; all processing stays fully on-device.

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