How to Batch Convert Images

Step-by-step instructions

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   Method 1: FFmpeg (all platforms, command line)

   Linux/Mac: for f in *.jpg; do ffmpeg -i "$f" "${f%.jpg}.webp"; done. Windows Command Prompt: for %f in (*.jpg) do ffmpeg -i "%f" "%~nf.webp". Windows PowerShell: Get-ChildItem *.jpg | ForEach-Object { ffmpeg -i $_.FullName "$($_.BaseName).webp" }. FFmpeg handles JPEG, PNG, WebP, TIFF, BMP, GIF, and more.

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   Method 2: ImageMagick (all platforms)

   Install ImageMagick (imagemagick.org, free). Convert all JPGs to WebP: magick mogrify -format webp -quality 85 *.jpg. Convert all PNGs to JPG with 90% quality: magick mogrify -format jpg -quality 90 *.png. Process recursively: find . -name '*.png' -exec magick convert {} {}.jpg \;. ImageMagick is the most powerful command-line image processor.

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   Method 3: IrfanView (Windows, free GUI)

   Download IrfanView (irfanview.com, free). File → Batch Conversion/Rename. Add all your image files or point to a folder. Select output format (JPG, PNG, WebP, TIFF, etc.). Set quality and options. Choose output folder. Click Start Batch. IrfanView processes hundreds of images in seconds.

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   Method 4: Automator or Shortcuts (Mac)

   Mac's built-in Automator: create an Automator workflow → add 'Change Type of Images' action → set output type → run on a folder. Or use Shortcuts.app: create a shortcut with 'Get Files from Folder' + 'Convert Image' + 'Save File'. Both are free and require no additional installs.