Byte limit (App Store keyword field)

A byte is the unit of storage. In UTF-8 the number of bytes per character depends on the script:

Plain English letters, digits and commas cost one byte each. Accented Latin letters usually cost two, Cyrillic two per letter and Japanese typically three per character. See UTF-8.

A field of 100 bytes holds about 100 English letters, but only about 50 Cyrillic letters or about 33 Japanese characters including commas. A Japanese keyword list therefore holds roughly a third as many characters as an English one. This is why keyword localization must pack each language separately.

• Separate terms with commas and no spaces. Each comma costs a byte.
• Each keyword must be longer than two characters.
• App Review Notes also count in bytes, up to 4000.

A hypothetical Japanese habit app lists 習慣化,タスク管理,目標設定 (14 characters). The count is 38 bytes, leaving 62 bytes for more terms.

• Using a character counter on the keyword field.
• Adding spaces after commas.

Check your list with the keyword field checker and the quick answer keywords in 100 bytes. See also CJK characters.