Characters that exist but can’t be seen
Sounds weird, right? But Unicode includes several characters that take up zero visible space, zero-width spaces, zero-width joiners, zero-width non-joiners, word joiners, and other non-printing code points. They’re real characters. They count toward character limits. Applications process them. But your eyes can’t see them.
This tool does two things. First, it lets you copy these invisible characters with one click so you can paste them wherever you want. Second, it has a detector mode: paste any text in, and it’ll reveal hidden invisible characters lurking inside, showing you their exact Unicode code point and position.
What’s included
- One-click copy for zero-width space (U+200B), zero-width joiner (U+200D), zero-width non-joiner (U+200C), word joiner (U+2060), and several others
- A detection scanner that identifies hidden characters in pasted text
- Each detected character shows its Unicode name and position
- Characters produce zero visible output when pasted
- All processing happens in your browser
How to use it
To generate: find the invisible character you want in the list and click Copy. Paste it wherever.
To detect: paste suspicious text into the detection area. The scanner runs instantly and reveals any hidden characters, showing what they are and where they sit in the string.
Here’s a fun one: copy a zero-width space and paste it into a social media username field. It counts as a character (so the field accepts it), but it displays as… nothing. The detector would then catch it if someone pasted that username back in.
Why these exist (and who cares)
Blank posts on social media: some people want to post “nothing.” An invisible character lets you submit a post that looks empty.
Display names: platforms that don’t allow blank usernames will accept a zero-width space. It looks empty but technically isn’t.
Text watermarking: this is the clever one. Embed a unique pattern of invisible characters into a document. If someone leaks it, you can trace which copy they had. Like a digital fingerprint that’s invisible to the naked eye.
Debugging: ever had a comparison that should match but doesn’t? Or a string that behaves strangely when parsed? There might be invisible characters hiding in it. The detector finds them. I’ve spent hours debugging issues that turned out to be a zero-width space hiding in copied text.
Soft word breaks: zero-width spaces create line-break opportunities in long strings without adding visible spacing. Useful for long URLs or unbroken text in narrow containers.
Fair warning: some platforms strip invisible characters, and some applications choke on them. Always test on your target platform before relying on this in anything important. You can also verify invisible characters are being counted by running your text through the Character Counter.
FAQ
What’s a zero-width space exactly?
It’s Unicode character U+200B. It takes up no visible space but acts as a word-break opportunity. Browsers can break a line at that point in long text, but nothing appears on screen.
Can the detector find everything?
It catches the common ones: zero-width spaces, joiners, non-joiners, word joiners, directional marks. Extremely rare Unicode control characters might not be named specifically but will still get flagged as non-printable.
Do they affect word counts?
Depends on the tool. Toolsvu’s Word Counter splits on whitespace. Since zero-width spaces aren’t technically whitespace, they don’t create word boundaries. But they are counted by the Character Counter.
Is this private?
Yes. All generation and detection happens in your browser. Nothing leaves your device.