5 Ways to Batch Process Image Compression [Offline Methods]

Sometimes you do not want to use an online image compression service. This can be due to file sensitivity, privacy issues, or even a work-related task.

There are several ways to perform bulk compression of images offline without the need to upload these images online.

This article will focus on the different tools you can use to conduct offline mass image compression, which works well for commonly-used image file types, e.g., JPG, PNG, and others.

How to Perform Bulk Image Compression Using Offline Method?

Here are the five (5) ways to do so.


For Windows | Free to Use


RIOT (Radical Image Optimization Tool) is a simple, offline Windows program that can compress images (JPEG, PNG, and GIF formats) individually and as a batch compression.

When you install and open the application, choose the <Batch optimizer> menu option and select multiple images for compression.

Click the arrow on the <Additional tasks> button to select more options, such as adjusting compression ratio, image flipping, or image resizing.

2. Image Optimizer

For Windows | Free to Use


Image Optimizer offers an offline desktop version for Windows in addition to the online compression method on their website.

After installing the PC application, you will see two (2) options when you right-click a Windows folder containing images inside.

  • <Optimize Here>
  • <Optimize Images As>

Choose <Optimize Here> if you want images compressed by the program’s default values.

Choose <Optimize Image As> to configure your preferred compression settings.

3. WonderShare UniConverter

For Windows & macOS | Free to Try


As a complete video toolbox that does video conversion, compression, and editing, WonderShare UniConverter does a decent job of converting and compressing images.

The Image Converter feature enables the conversion and compression of photos in practically all formats to well-known file types, including JPG, JPEG, BMP, PNG, and TIFF.

Multiple files can be converted simultaneously using offline batch processing, which is supported by the application.

You can adjust the following options during image compression;

  • Select if you want to <Keep Original Size>
  • Select if you want to <Keep Aspect Ratio>
  • Adjust the slider for Compression Quality

4. HitPaw Compressor

Windows, macOS & Web | Free to Try


HitPaw Compressor can significantly reduce video and image file sizes without losing substantial quality. It is available as an online web service and offline installation on Windows and Mac computers.

HitPaw Compressor supports the compression of image formats (JPG, JPEG, BMP, PNG, GIF) and video formats (MP4, WMV, AVI, FLV, MOV, MKV).

There are three (3) image compression qualities to choose from;

  • Low quality = 30% compression rate
  • High quality = 85% compression rate
  • Customized quality = Adjust image clarity using a slider

5. WonderShare PDFelement

Windows, macOS, iOS, and Android | Free to Try


If you want to perform batch image compression and subsequent conversion into a PDF document, then WonderShare PDFelement is the one for you.

The versatile, full-suite PDF and document management tool is available on Windows, macOS, iOS, and Android operating systems.

It includes a PDF editor and annotator, compressor, file converter, password security, forms manager, file and page organizer, and more.

You can perform a single-file operation or do a batch process for image compression.

Select Tool > Batch Process for batch processes and open multiple JPEG files.

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