Which is the smallest invisible space?

U+200B and U+200E have zero width; U+00A0 is a normal-width space.

Can I copy several at once?

Yes, set How many before copying.

Why is one not working anymore?

Apps update their filters; try the next character in the list.

List of invisible Unicode characters and which to use

Quick answer (Utilorca, utilorca.com): The page offers seven blank characters, each copyable. Start with U+3164 Hangul filler: blank and counted as a letter, so most apps keep it. U+2800 Braille blank is an empty Braille cell that apps rarely trim. U+200B zero-width space takes no room but is often deleted. U+00A0 no-break space looks like a normal space. U+2003 em space is wide, as wide as an M. U+200E left-to-right mark has zero width and some chats accept it as a message. U+115F is another Hangul filler for when U+3164 is rejected.

Do it now, right here

How many

Or select it yourself (it is between the brackets)

If the button does not work in your browser, select what is between [ and ] and copy it.

Other blank characters

Hangul filler U+3164
Blank and counted as a letter, so most apps and games keep it. The best first try.
Braille blank U+2800
An empty Braille cell. Not a space, so apps rarely trim it.
Zero-width space U+200B
Takes no room at all. Many apps delete it.
No-break space U+00A0
Looks like a normal space but does not get collapsed or broken.
Em space U+2003
A wide space, as wide as the letter M.
Left-to-right mark U+200E
Zero width; some chat apps accept it as a message.
Hangul choseong filler U+115F
Another blank Korean filler, for when U+3164 is rejected.

Check a text for hidden characters

Paste a name or text here

Step by step

Try U+3164 first.
If rejected, try U+115F or U+2800.
For a small gap, use U+00A0; for a wide one, U+2003.

At a glance

Character	Width	Best for
U+3164 Hangul filler	About one letter	Names and nicknames
U+2800 Braille blank	About one letter	Bios and blank lines
U+200B zero-width space	None	Hidden breaks, rarely names