Invisible Character & Zero-Width Detector

The Invisible Character and Zero-Width Detector finds hidden Unicode characters in text that you cannot see but that can change how text behaves: zero-width spaces, zero-width non-joiners, non-breaking spaces and similar characters. These can sneak in from copied web pages, documents or messages, and they can break searches, passwords, code and comparisons that look identical on screen.

To use it, paste the suspect text and run the detection. The tool highlights the hidden characters and shows where they sit, then lets you strip them out. Use it when a password, a code snippet or a copied value fails for no visible reason, or before publishing text that was copied from elsewhere. After cleaning, paste the result back and test it in place, because the hidden character may have been the only thing making two apparently identical strings different.

Be careful with text you clean for other people. Removing invisible characters changes the underlying bytes even though the visible text looks the same, so keep the original until you have confirmed the cleaned version works.

One honest limitation: the tool can only find characters in the text you paste. It cannot scan files on your device or pages on the web by itself, and it cannot judge whether a hidden character was placed there deliberately or arrived by accident.