Invisible Character Detector

An invisible character is a Unicode code point that takes up space in a string but renders as nothing visible on screen. Common examples include the zero-width space (U+200B), zero-width joiner (U+200D), non-breaking space (U+00A0), directional marks (U+200E, U+200F), and the byte-order mark (U+FEFF). They often enter text through copy-paste from websites, word processors, AI-generated content, or messaging apps.

The most common sources are: copy-pasting from web pages or PDFs (which embed non-breaking spaces and soft hyphens), AI writing tools like ChatGPT (which frequently insert zero-width spaces between words), importing from Word or Google Docs, and bidirectional text editing in apps that add directional marks automatically.

Yes. They can break string comparisons and search queries (two strings look identical but aren't), cause unexpected behavior in code and databases, trigger grammar checkers and plagiarism detectors, interfere with word counts, and in some cases (like the right-to-left override U+202E) be used maliciously to spoof filenames or URLs.

Yes, frequently. ChatGPT, Claude, and other LLMs are known to insert zero-width spaces (U+200B) and other invisible Unicode characters throughout generated text. This is one reason AI detectors can sometimes identify AI-written content — the pattern of invisible characters can be a tell. Cleaning the text with this tool removes those markers.

Paste your text into the detector above. It will highlight all invisible characters with color-coded labels. Click 'Remove All' to strip every detected invisible character at once, or copy the cleaned text directly from the output area.

Yes, completely free with no account required. All detection and removal runs entirely in your browser — your text is never uploaded to any server.

The tool detects 35+ Unicode invisible characters across four categories: zero-width characters (zero-width space, zero-width joiner, word joiner, BOM, and invisible math operators), directional marks (LTR mark, RTL mark, LTR/RTL embedding and override, isolate controls), format characters (soft hyphen, combining grapheme joiner, line/paragraph separators), and whitespace variants (non-breaking space, thin space, hair space, narrow no-break space, and several others).

The zero-width space (U+200B) is the most common invisible character. It has no visible width but breaks a word for line-wrapping purposes. It is widely used on the web, frequently appears in AI-generated text, and can cause hard-to-debug string-matching issues because it makes two strings that look identical actually differ.

Yes. Switch to the 'Copy & Paste' tab to access a list of commonly used invisible characters with one-click copy buttons. The Hangul Filler (U+3164) and Zero-Width Joiner (U+200D) are popular for blank Discord names and invisible usernames on many platforms.

Yes. Detection runs entirely in your browser using fast character-by-character scanning with no server round-trip, so it handles very large texts (100,000+ characters) without any issues.

A blank character is any Unicode character that appears empty or invisible when rendered — including the zero-width space (U+200B), Hangul Filler (U+3164), ideographic space (U+3000), and non-breaking space (U+00A0). The term 'blank character' is commonly used when people want an invisible placeholder for usernames, nicknames, or form fields. This tool detects all of them.

The easiest way is to copy one from this tool's 'Copy & Paste' tab. Alternatively, on Windows you can use the Character Map app (search for it in Start), on Mac use the Special Characters menu (Edit → Emoji & Symbols), or type the Unicode codepoint directly in many apps by entering the hex code followed by Alt+X (Windows Word) or using a Unicode input method.

To make text invisible (blank), use an invisible Unicode character like the zero-width space (U+200B) or Hangul Filler (U+3164) in place of visible text. These characters render as empty space on most platforms. Use the 'Copy & Paste' tab above to copy the character you need. Note that invisible text can still be selected, copied, and detected by tools like this one.