This document is the user manual for CodeVisionAVR version 1.25.8. It begins with an introduction and overview of the CodeVisionAVR integrated development environment. It then describes how to work with files, projects, and tools within the IDE. The next sections provide a reference for the CodeVisionAVR C compiler and included library functions. The final sections describe the CodeWizardAVR automatic program generator and include licensing information, technical support details, and contact information.