Copied text often brings repeated spaces, irregular line endings or duplicate list items. Cleaning is easier when you separate formatting problems from editorial decisions. Keep the original, make one mechanical change at a time and compare the result.
Start with spacing
The Text Cleaner trims line edges and replaces runs of horizontal spaces and tabs with one ordinary space. If you enable the blank-line option, long runs of empty lines become a normal paragraph gap. The tool does not rewrite sentences or decide which words should be removed.
Protect structure that matters
Spacing can carry meaning in source code, poetry and columns aligned with spaces. Do not run an aggressive cleanup over these formats without checking the result. For ordinary prose, line trimming is often useful; for a table, it can destroy the visual alignment.
Remove duplicates only when they are duplicates
Put one item per line in Remove Duplicate Lines. The first occurrence is preserved. Ignoring surrounding spaces or case changes the matching rule, while the original retained line remains available in the output. The tool does not sort the list or detect sentences that merely mean the same thing.
Review case separately
A case converter can standardize an all-uppercase draft, but the mechanical result needs an editorial review. Sentence case lowercases names and acronyms before capitalizing sentence starts. Restore names such as Madrid and abbreviations such as URL where appropriate.
Finish with a comparison
Check the first and last lines, any headings and several examples from the middle. Copy the final result or download it as plain text. A download happens only when you request it, and the source document should remain your reference copy.