Loamstack

Open, explore and edit CSV, TSV, JSON and Parquet files locally. Your browser workspace for Loamstack.

Loamstack gives your data files a clear, spacious workspace in a browser tab. Open a local file, search and sort its rows, inspect columns, edit supported values, undo changes and download a new copy. • CSV and TSV editing, with quoted values and Unicode support. • JSON and JSONL record tables, with nested values available for inspection. • Parquet inspection and supported flat-field editing with typed export. • Light and dark appearance, adjustable density and responsive tools. • Optional link import: right-click an HTTP or HTTPS file link, review its address and explicitly grant access to that host before import. Local file editing works offline. No account or payment is needed. There is no telemetry or automatic upload. All executable code and fonts are bundled. Optional link imports omit cookies and authentication credentials and reject redirects. Optional website links do not send file contents, names or table state. Downloads contain the complete edited document, including rows hidden by search. Original files are never overwritten. Input limit:32MiB;100,000rows;1,000columns;1million cells. Parquet also has decoded-data limits. Unsupported nested JSON and Parquet fields are inspection-only.