With vs without spaces
“With spaces” counts every character including spaces and line breaks; “without spaces” drops spaces, tabs and line breaks. Korean text typically has a space every 4–5 characters, so the no-space count is 15–20% lower.
Two kinds of bytes
Legacy Korean systems (EUC-KR / CP949) store ASCII in 1 byte and Hangul in 2 bytes, so a 1,000-byte limit fits about 500 Hangul characters; Windows line breaks (CR+LF) take 2 bytes. UTF-8 stores Hangul in 3 bytes and emoji in 4. Match whichever scheme the form you are filling in uses.
