Text pasted from a word processor or a web page often carries invisible baggage: doubled spaces, tabs mixed in with spaces, non-breaking spaces, even zero-width characters that don't render at all. This collapses repeated spaces, trims each line, converts tabs, and strips invisible characters that look identical to a normal space while silently breaking exact-match comparisons.
When you'd use this
Cleaning up text before feeding it into something that treats whitespace literally, such as a diff, a search-and-replace, or a data import, where one invisible non-breaking space can make two identical-looking values fail to match.
Common errors
If a comparison elsewhere still fails after cleanup, check that the "remove invisible characters" option was enabled. Plain space-collapsing leaves non-breaking spaces (U+00A0) and zero-width characters untouched, since from a text-processing point of view those aren't regular spaces at all.
Frequently asked questions
What are "invisible characters" exactly, and where do they come from?
Mainly the non-breaking space, used in typography and web content so a line won't wrap at that point, plus zero-width space and joiner characters that turn up in some fonts and copy-paste pipelines for formatting reasons. All of them look identical to a normal space, or to nothing at all, yet they're different Unicode code points, so a value with one embedded won't exact-match the same-looking value without it.
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