• Reference & Education, K-12 Education
• INP file online viewer
• July 18, 2026

An INP file is usually an input file or data file used by a specific program. The `.inp` extension commonly comes from the word “input,” which means the file provides information, instructions, settings, or data that a software program needs before it can perform a task. Unlike a photo, video, PDF, or Word document, an INP file is often not …