fixed-length

[ fikst-lengkth, -length ]
/ ˈfɪkstˌlɛŋkθ, -ˌlɛŋθ /

adjective Computers.

referring to a field, record, computer word, or other entity whose length does not vary.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019