XnConvert is described as 'Easy image converter for graphic files, photos and images available on Windows, MacOSX and Linux' and is a popular Image Optimizer in the photos & graphics category. There are more than 100 alternatives to XnConvert for a variety of platforms, including Windows, Mac, Web-based, Linux and GIMP apps. The best XnConvert alternative is ImageMagick, which is both free and Open Source. Other great apps like XnConvert are TinyFast, Converseen, RIOT - Radical Image Optimization Tool and Filestar.
ImageMagick is a software suite to create, edit, and compose bitmap images. It can read, convert and write images in a variety of formats (about 100) including GIF, JPEG, JPEG-2000, PNG, PDF, PhotoCD, TIFF, and DPX.
Compress images, videos, and PDFs directly on your Mac with local batch processing, no internet required, and full privacy. Features drag-and-drop workflow, smart quality preservation, on-device optimization, and subscription options for premium tools.
Converseen is a free cross-platform batch image processor for Windows and Linux that allows you to convert, resize, rotate and flip an infinite number of images with a mouse click.
Saving images for web/email/other media with the best compression ratio and quality is a difficult task if you don’t have the right tools. Choosing the right format then choosing the right parameters are the key factors of smaller files.
Lacks support for some modern image formats like WebP, also lacks HEIC.
With Filestar you can "do anything with any file". Get rid of repetitive tasks, save time and boost your productivity with over 30.000 file conversions available. Transform or convert hundreds of files, all at the same time with a few simple clicks.
Easier and do more formats/skills!
GraphicsMagick is the swiss army knife of image processing. Comprised of 282K physical lines (according to David A. Wheelers SLOCCount) of source code in the base package (or 952K including 3rd party libraries) it provides a robust and efficient collection of tools and libraries...
Switcheroo is designed to give you a simple, quick, and easy-to-use tool to convert and manipulate your images in whatever way you like. It is built on top of the most advanced image editing libraries, ImageMagick.
Batch process photos with resizing, cropping, color adjustments, text or watermark overlays, preview changes before saving, automate renaming with custom patterns, support for major formats, folder structures, preset settings, and drag-and-drop management.
Graphic Converter for Mac and Windows, can converts image formats BMP, JPG, GIF, ICO, PNG, TIF, TIFF, JPEG, WMF, EMF, PSP, PSD, PCM, SVG, RAW and more.
Create email-friendly images, resize in batches, convert formats, and compress using high-quality filters. Integrated in Windows Explorer, it offers high-res settings, watermarking, a profiles library, PDF creation, and supports devices like iPad and iPhone.
ReaConverter is time-saving batch image converter software that supports more than 700 source formats and over 60 output formats.
Using advanced lossy compression, TinyPNG reduces PNG file sizes by 50-80%, preserving full transparency and minimizing quality loss. Ideal for web designers, it increases website speed, saves bandwidth, and offers tools like a Photoshop plugin and API for seamless integration.
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It converts the type, and has less functions. But to me that's better. I already have decent image editors like Photoshop or GIMP, so those functions of xnconvert are more like a toy.
Converseen does one thing well, it batch converts images to many different types of images.
It's also open source.