PowerShell Tutorials

How to Compress Image File Sizes With PowerShell

Learn to how compress image file sizes using PowerShell! Optimize your website’s content for faster loading times. Automate the process, reduce file sizes without compromising quality. Let’s dive in and compress images with PowerShell!


In today’s digital age, images play a crucial role in web design, marketing, and various other domains. However, large image file sizes can negatively impact website performance, leading to slower load times and a poor user experience. Compressing image file sizes is an effective solution to optimize your website and enhance its performance.

PowerShell, a powerful scripting language developed by Microsoft, offers a convenient and efficient way to automate tasks, including image compression. By utilizing PowerShell, you can reduce image file sizes without sacrificing their quality, resulting in faster website loading times and improved user satisfaction.


Using PowerShell to Compress Image File Sizes

PowerShell is a powerful scripting language developed by Microsoft that allows you to automate administrative tasks and perform various operations on your computer system. By leveraging its capabilities, you can efficiently compress image file sizes with just a few lines of code. Let’s walk through the process step by step.

  1. It sets the folder path where the original images are located (variable: $folderPath).
  2. It sets the output folder path where the compressed images will be saved (variable: $outputFolderPath).
  3. It checks if the output folder exists. If it doesn’t exist, it creates it using the New-Item cmdlet.
  4. It retrieves all the JPEG image files in the specified folder using the Get-ChildItem cmdlet and stores them in the $imageFiles variable.
  5. It sets the desired compression quality (variable: $compressionQuality). The value ranges from 1 to 100, where 100 represents the highest quality.
# Explicitly load the System.Drawing assembly
Add-Type -AssemblyName System.Drawing

# Set the folder path where the images are located
$folderPath = "C:\Image-Source"

# Set the output folder path where the compressed images will be saved
$outputFolderPath = "C:\Image-Destination"

# Check if the output folder exists, if not, create it
if (-not (Test-Path -Path $outputFolderPath)) {
    New-Item -ItemType Directory -Path $outputFolderPath | Out-Null

# Get all the image files in the folder
$imageFiles = Get-ChildItem -Path $folderPath -Filter *.jpg -File

# Set the desired compression quality (from 1 to 100, where 100 is the highest quality)
$compressionQuality = 60

# Get the JPEG codec info for saving the compressed images
$jpegCodec = [System.Drawing.Imaging.ImageCodecInfo]::GetImageEncoders() | Where-Object { $_.MimeType -eq "image/jpeg" }

# Compress each image file and save it in the output folder
foreach ($file in $imageFiles) {
    $outputFilePath = Join-Path -Path $outputFolderPath -ChildPath $file.Name
    Write-Host "Compressing $($file.Name)..."
    try {
        $image = [System.Drawing.Image]::FromFile($file.FullName)
        $encoderParams = New-Object System.Drawing.Imaging.EncoderParameters
        $encoder = [System.Drawing.Imaging.Encoder]::Quality
        $encoderParam = New-Object System.Drawing.Imaging.EncoderParameter($encoder, $compressionQuality)
        $encoderParams.Param[0] = $encoderParam
        $image.Save($outputFilePath, $jpegCodec, $encoderParams)
        Write-Host "Compression complete."
    catch {
        Write-Host "Failed to compress $($file.Name): $_"

If any errors occur during the compression process, it outputs a message indicating the failure to compress the specific file.

Overall, this script allows you to compress multiple JPEG images in a folder and save the compressed versions to a different folder, providing control over the compression quality.

How to Compress Image File Size With PowerShell – FAQs

Here are some frequently asked questions related to compressing image file size with PowerShell:

Q1: Can I compress image file sizes of different formats using PowerShell?

A1: While the code provided in this guide specifically targets JPEG images, you can modify it to support other image formats such as PNG or GIF. You’ll need to update the file filter, codec information, and save method accordingly.

Q2: What happens if I set the compression quality to 100?

A2: Setting the compression quality to 100 ensures the highest image quality but may result in larger file sizes. It’s a trade-off between quality and file size. You can experiment with different quality values to find the right balance for your needs.

Q3: Can I automate the image compression process with a script?

A3: Absolutely! PowerShell is designed for automation and scripting. You can encapsulate the image compression code within a script, allowing you to compress images in bulk or as part of a larger automation workflow.

Q4: Are there any risks of image quality degradation during compression?

A4: When compressing images, there is a possibility of slight quality degradation. However, by carefully choosing the compression quality value, you can minimize the loss while achieving significant file size reduction. It’s recommended to test and evaluate the results to ensure the compressed images meet your expectations.

Q5: Are there any alternative tools or methods for compressing image file sizes?

A5: Yes, there are various tools and software available for image compression, both online and offline. However, PowerShell provides a flexible and scriptable approach, making it an excellent choice for automating the image compression process, especially for large batches of images.

Q6: Can I run the PowerShell script on different operating systems?

A6: PowerShell is primarily designed for Windows systems. However, with the introduction of PowerShell Core, it is now cross-platform and supports major operating systems such as Windows, macOS, and Linux. Ensure that you have the appropriate version of PowerShell installed for your operating system.


Optimizing image file sizes is crucial for improving website performance and user experience. With the help of PowerShell, you can easily compress image file sizes without compromising quality. In this guide, we walked through the process of compressing image file size with PowerShell, from setting the folder paths to automating the compression process. By following these steps, you can efficiently optimize your website.

I hope this article was helpful! You can find more here: PowerShell Articles

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Patrick Domingues

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