The best free desktop tools for batch-converting multiple JPG files to TIFF files are XnConvert, IrfanView, and reaConverter Lite, which offer robust offline processing without file size restrictions. While online converters exist, desktop software is significantly faster for processing large groups of files and safer for data privacy. Top Free Desktop Batch Converters
XnConvert: This is arguably the most powerful free cross-platform batch image converter available.
It supports over 500 image formats and allows you to apply over 80 different editing actions (like resizing, rotating, and color adjustments) during the conversion process.
It is entirely free for personal use and is compatible with Windows, Mac, and Linux.
IrfanView: A lightweight, lightning-fast Windows classic that handles bulk image conversion through its built-in batch processing engine.
You can load hundreds of JPG files, set advanced TIFF compression options (like LZW or PackBits), and convert them instantly.
reaConverter Lite: A highly reliable free edition of a professional tool specifically designed for bulk image transformations on Windows.
It features a clean, simple interface and integrates directly into the Windows Explorer right-click context menu, allowing you to convert files without even opening the main program window. Built-in Operating System Solutions
If you do not want to download third-party software, your operating system already contains tools capable of image conversion.
Microsoft PowerToys (Windows): This official utility suite from Microsoft includes an “Image Resizer” tool. By highlighting multiple JPGs in File Explorer, right-clicking, and selecting the tool, you can rapidly change formats.
Apple Preview (macOS): Mac users can batch-convert natively. Open all your JPG images at once in the Apple Preview app, highlight them all in the sidebar using Command + A, go to File > Export Selected Images, and select TIFF from the options dropdown menu.