Why invisible characters matter
Invisible Unicode characters are easy to miss because they do not look broken in a normal editor. The problem only shows up later: copy changes fail, identifiers stop matching, layout wraps oddly, or text starts behaving differently in RTL contexts.
What this tool catches
This checker looks for four common groups: zero-width marks, bidi controls, special spacing characters, and format controls. It tells you exactly where they appear, gives you an annotated preview, and prepares a cleaned version you can copy or export.
When to use it
Use it after copying text from docs, PDFs, spreadsheets, chat apps, CMS editors, or design tools. It is especially useful when a string looks normal but comparisons, rendering, or downstream processing keep behaving strangely.