Invisible Character Detector

What is an invisible character?

An invisible character is a Unicode code point that occupies a position in a string but has no visible glyph, or one so subtle it's easy to miss. This includes zero-width spaces used to break words without a visible gap, non-breaking spaces that look like a normal space but behave differently, byte order marks (BOM) left over from file encoding, bidirectional control characters used for right-to-left scripts, and standard control characters like tabs and carriage returns.

Why invisible characters cause problems

Text copied from Word, Google Docs, PDFs, or web pages often carries hidden characters along with it. Once pasted elsewhere, they can:

• Break code and configuration files — a stray zero-width space in a variable name or JSON string can cause a silent parsing error.
• Fail exact-match comparisons — two strings that look identical may not be equal if one contains a non-breaking space or BOM.
• Trip up AI detectors and plagiarism checkers — some tools insert invisible characters specifically to alter how text is fingerprinted.
• Cause inconsistent line endings — mixing CRLF, LF, and CR line endings can create diffs or formatting issues across operating systems.
• Hide malicious or misleading content — bidirectional override characters can be used to make text display in a different order than it's stored.

What this tool detects

Paste any text into the box above and it's scanned instantly, entirely in your browser. The tool flags zero-width characters, space variants (non-breaking, thin, hair, ideographic, and more), bidirectional control marks, byte order marks, soft hyphens and other formatting controls, tabs, and control characters, then shows each one's name, Unicode code point, and how many times it appears. A text preview highlights exactly where each character sits in your content, and the Clean & Copy button strips the flagged characters and normalizes line endings in one click.

Frequently asked questions