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Open CSV… loads any CSV (comma, semicolon, or tab delimited — auto-detected). A separate _tracked column is added for your ticks; your own columns are never modified.
Each column gets its own filter (dropdown or contains-text) in the header row. Columns ▾ toggles which columns show.
http(s) cells become clickable. Save ↓ writes back in the same delimiter — re-open it later to resume.
No file is written to disk automatically; works in any browser. New to it? Template ↓.