Can I have a fully blank Roblox name?

No, display names need visible characters.

How often can I change my display name?

Roblox limits it, typically once every 7 days.

Is it against the rules?

Trying to bypass filters can break Roblox's rules; keep it to spacing.

Invisible character for Roblox display names and chat

Quick answer (Utilorca, utilorca.com): Roblox is strict. Usernames may only contain letters, numbers and one underscore, so invisible characters cannot be used there. Display names allow more, but Roblox filters unusual characters and may reject or strip blanks; U+3164 placed between letters has the best chance, while a name made only of blanks is refused. In chat, Roblox's filter usually removes invisible characters or blocks the message. If something is rejected, try another character from the list, but expect many to fail.

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

Copy U+3164.
Paste it between letters in your display name.
Save; if rejected, try U+115F or give up on blanks.

At a glance

Field	Invisible characters?	Note
Username	No	Letters, numbers, one underscore
Display name	Sometimes, between letters	Filtered by Roblox
Chat	Usually removed	Chat filter