Open Large CSV Files Instantly

Large CSV Viewer opens large CSV files of any size directly in your browser — no Excel, no install, no file size limit. Files are streamed in chunks using DuckDB, so even multi-gigabyte CSVs with hundreds of millions of rows open without crashing your browser. It is completely free with no account required.

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Open any large CSV file in your browser — no install, no size limit, no crashes. Filter, sort and search millions of rows for free.

Struggling to open a multi-gigabyte CSV that freezes Excel or crashes LibreOffice? Large CSV Viewer streams your file in chunks so your browser stays fast regardless of row count — whether it's 1 million rows or 100 million.

Key features

  • No file size limit — tested on files over 10 GB
  • Chunked streaming so your tab never crashes
  • Instant column detection and data-type inference
  • Filter, sort, and search without waiting for the full file to load

How it works

  1. Upload your CSV. Drag and drop your file onto the viewer or click to browse. Files are uploaded in chunks so even multi-gigabyte files start immediately.
  2. Explore your data. Your data appears in a clean, sortable table instantly. Use the search bar, column filters, and sorting to find exactly what you need.
  3. Export your results. Download your filtered or edited dataset as CSV, JSON, or Excel with one click — no row limits on export.

Ready to try it?

Free, instant — no account or install needed.

Open CSV Viewer →

Frequently asked questions

What is the maximum CSV file size I can open?

There is no hard limit. Files are uploaded in chunks and processed with DuckDB on the server, so even multi-gigabyte files open without freezing your browser.

Does the file stay on the server?

No. Your file is processed in memory for your session only and purged automatically when you close the tab or upload a new file.

Why does Excel fail to open large CSV files?

Microsoft Excel has a hard limit of 1,048,576 rows per worksheet. Files larger than this are simply truncated or fail to open. Large CSV Viewer has no such limit.

Can I sort and filter a large CSV file?

Yes. Sorting and filtering run server-side using DuckDB, so they operate on the full dataset regardless of size — not just the visible page.

Is it free to open large CSV files?

Yes, completely free. No account, no credit card, and no file size paywall.