About Large CSV Viewer
What is Large CSV Viewer?
Large CSV Viewer is a free online tool that lets you open, view, filter, sort, search, and edit CSV files of any size — from a few kilobytes to multiple gigabytes with hundreds of millions of rows. Unlike spreadsheet applications that crash or freeze on large files, Large CSV Viewer uses a streaming architecture to handle your data efficiently without ever overwhelming your browser.
About the Creator
Large CSV Viewer is built and maintained by Md Soleyman. Designed to solve the bottleneck of handling massive datasets in the browser, the tool leverages modern web technologies like DuckDB (for high-performance, in-memory SQL analytics) and Papa Parse to deliver desktop-grade performance on the web.
Connect with me on X (Twitter) or check out my open-source work on GitHub.
Key features
- View CSV files with millions of rows without freezing
- Global search, per-column filters, and regex support
- Inline cell editing with full undo/redo (Ctrl+Z)
- Find and replace across the entire dataset
- Export as CSV, JSON, or Excel
- Column visibility toggling and color highlighting
- Infinite scroll and paginated view modes
- No account required. No file size limits.
Privacy
Your files are temporarily processed server-side to power fast queries. They are never stored permanently, never shared, and are purged automatically when your session ends. See our Privacy Policy for full details.