Reference
Look up invisible Unicode characters: name, code, category and compatibility notes.
Filler
A blank braille pattern. It often leaves a gap, but it is not the space-bar character.
Often looks like a gap. Some apps show it; others trim it or replace it with a box.
10 characters
From 1 to 2000. 0 leaves the field empty.
Preview
10 characters invisible
If you need a block that looks empty, start with Braille Blank. If the field trims it, try Hangul Filler. Zero-width codes insert something without a gap; ZWNJ prevents joining and ZWJ causes it, including in emoji. They are not generic spaces.
Help
What each code does and why ZWJ is not a space.
No. The joiner joins characters, including emoji. The non-joiner stops them merging.
It is the official standard name, for example BRAILLE PATTERN BLANK.
No. Fillers usually take space. Zero-width codes barely move the cursor.
Tools
The generator is the starting point. The detector and guides help you see which character you are using.