Invisible Character Detector

The Invisible Character Detector is a utility that scans input text for hidden, non-printing, or visually indistinguishable Unicode characters. These include zero-width spaces, zero-width joiners, non-breaking spaces, directionality marks, and other formatting characters that can silently alter the behavior or appearance of text without being visibly noticeable to the user.

The tool analyzes each character in a string and identifies whether it is a standard visible character or an invisible control/formatting character. It is commonly used for debugging text-related issues, detecting hidden payloads in copied content, and ensuring clean data in programming, messaging systems, and content pipelines where invisible characters may cause unexpected bugs or inconsistencies.

For example, a string like "hello​world" may appear as a normal word visually, but the detector can reveal that a zero-width space (U+200B) exists between the words. Similarly, non-breaking spaces or bidirectional override characters can be flagged so developers and users can understand exactly what is present in the input.

By exposing otherwise hidden Unicode behavior, the Invisible Character Detector helps improve data integrity, prevents formatting-related bugs, and ensures that text is exactly what it appears to be.