Text Cleanup Workbench

Add cleanup operations to a pipeline, reorder them however you like, and see the result update live. Order matters — sorting before deduplicating gives a different result than deduplicating before sorting — so the pipeline is explicit and always visible. Text is only ever treated as plain text: nothing here is rendered as HTML, evaluated, or executed. Runs entirely in your browser — your file is not uploaded.

Regex safety

Regex-based steps (find/replace, extract/remove matching lines) run per line and are checked against a heuristic for common catastrophic-backtracking shapes (like (x+)+) before running — if flagged, you'll see a warning, but the step still runs since the heuristic isn't perfect and can be wrong in both directions. There's no way for a page running in the main browser thread to forcibly interrupt a single regex call that's actually hung, so the honest advice is: test an unfamiliar pattern on a small sample first. Everything else in this tool — trimming, sorting, case conversion, and so on — runs on capped input sizes and finishes fast enough that no progress/cancel UI is needed.