Modern tools go beyond simple file conversion, offering features like batch processing, image compression, and layout customization—all while keeping your data offline. Below is a comprehensive guide to the best free software available for Windows, Mac, and online use in 2026.

This is a top-tier choice for macOS users. You can simply drag and drop multiple images into the app, hold the "Ctrl" button to select several files, and convert them instantly.

For Windows users, the Microsoft Store offers several lightweight, specialized tools designed for high-speed offline conversion.

While online converters like Smallpdf and iLovePDF are convenient for one-off tasks, dedicated offline software offers significant advantages:

This tool is specifically built for merging multiple image formats —including HEIC, WEBP, and PNG—into a single document. It features customizable page sizes, margins, and preview options.