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6 Best Batch Image Converters in 2026

Converting a folder of photos one at a time gets old quickly. I’ve rounded up six apps that can do a batch, including free options and my own. Here’s how to get started in each.

1. How to Convert

Mac, Windows, Linux · $29 once

This is my app. It handles almost any file, so you can use it for photos as well as video, audio and documents. Drop in your files and choose the output; it finds and runs the conversion tools for you.

  1. 1. Add your files. Drag your images into How to Convert.

  2. 2. Choose the output and convert. Pick the format you need, such as JPG or PNG, and click Convert.

    How to Convert with photo.heic loaded and JPG selected as the output.
    HEIC to JPG shown here. The same format menu handles other image conversions. Example photo: NASA.

Other options

2. XnConvert

Mac, Windows, Linux · Free for private/educational use; business license available

Choose this for repeat batches that also need resizing or renaming. Company use requires a licence.

  1. Open XnConvert’s Input tab and add your files or folder.
  2. Leave Actions empty for a format change only. If you need smaller dimensions, add Resize and keep the aspect ratio to avoid stretching.
  3. Select JPEG for ordinary photos or PNG for transparency. Save to a new folder, then click Convert. Check a few results before processing the rest.
XnConvert Output tab with destination folder, filename and format controls.
Set the output format and destination here. Windows version shown. XnSoft.

JPG cannot keep a transparent background. Use PNG for a logo that needs to stay transparent.

3. IrfanView

Windows · Free for non-commercial use

A Windows image viewer with batch tools. Some formats need its plugin pack.

  1. Choose File → Batch Conversion/Rename and add your images.
  2. Select the output format and folder, then Start Batch.
Choose Batch conversion, an Output format and a destination, then Start Batch.
Choose Batch conversion, an Output format and a destination, then Start Batch. IrfanView tutorial.

4. FastStone Image Viewer

Windows · Free for personal/educational use

Good for browsing photos and converting a selection. Commercial use needs a licence.

  1. Select images in FastStone Image Viewer, then Tools → Batch Convert Selected Images.
  2. Choose an output format and folder, then Convert.
Add images to the Input List, set Output Format and Output Folder, then Convert. Older interface shown.
Add images to the Input List, set Output Format and Output Folder, then Convert. Older interface shown. FastStone tutorial, page 85.

5. Retrobatch

Mac · Paid; trial available

Useful when you repeat the same image job regularly.

  1. Add Read Folder and Write Images blocks, then connect them.
  2. Choose the source folder, output format and destination in those blocks. Click Run and save the workflow to reuse it.
Open Write Images to choose the destination folder and Convert to format.
Open Write Images to choose the destination folder and Convert to format. Retrobatch.

6. GraphicConverter

Mac · Paid; trial available

A Mac option for older image formats and batch jobs.

  1. Open File → Convert & Modify and select the source images.
  2. Set the destination and output format, then start the conversion.
Choose Destination Format and the source images, then Start selected Function.
Choose Destination Format and the source images, then Start selected Function. GraphicConverter guide.