CSV & Excel Toolkit

Files are parsed with a streaming RFC 4180 reader that handles quotes, escaped quotes, line breaks inside cells, BOMs, and detects the delimiter and encoding automatically. Eighteen operations share one engine: cleaning, deduplicating, filtering, sorting, splitting, merging, column edits and CSV/Excel conversion, chainable without re-uploading. Streaming operations (dedupe, filter, clean, replace) were measured at 250 MB in ~9 seconds; operations that must hold the whole table (sort, split, convert) get heavy above 50 MB, with ~100 MB as an approximate desktop maximum depending on browser and content.

Sorting, splitting, merging and Excel conversion load the whole table in memory; the interface labels each one with its measured practical limit. Excel reads take the first worksheet; formulas arrive as their cached values and date cells as Excel serial numbers unless stored as text. File contents are processed locally and never uploaded; the only telemetry is an aggregate operation counter with no file names, column names or contents.

The methodology and source notes were reviewed on 2026-07-25. Editable rates and inputs should still be checked against the provider or authority linked below.