Bigfile

Bigfile is a free, browser-based tool for exploring large data files without uploading them to a server. Open CSV, TSV, TXT, JSON, JSONL, and Parquet files, then browse, filter, sort, run SQL queries, and build charts — all processed locally with DuckDB WebAssembly.

Your data never leaves your device. There is no account, no cloud sync, and no server-side processing. Use it for a quick look at a spreadsheet export, a Parquet dump, or nested JSON without installing desktop software.

Drag and drop a file here, or choose one to load. Accepts CSV, TSV, TXT, JSON, JSONL, and Parquet. Data is processed locally and never leaves your browser.