What is the best png to jpg converter without losing quality?

Native PowerShell is a viable option, you can use it as a png to jpg converter for Windows. The approach relies on Windows' built-in .NET System.Drawing library, which means no third-party software is needed .

1. Open PowerShell as Administrator.
2. Allow scripts (first time only): Set-ExecutionPolicy RemoteSigned -Scope CurrentUser .
3. Navigate to your folder: cd "D:\Your\PNG\Folder".
4. Run a batch conversion using a script like this, which sets the JPEG quality to 90 :

powershell
$files = Get-ChildItem *.png
foreach ($file in $files) {
    $img = [System.Drawing.Image]::FromFile($file.FullName)
    $newPath = [System.IO.Path]::ChangeExtension($file.FullName, ".jpg")
    $img.Save($newPath, [System.Drawing.Imaging.ImageFormat]::Jpeg)
    $img.Dispose()
}

To specify a higher quality explicitly, you can use the encoder parameters approach .

Here is the part that is often misunderstood. Converting a PNG to a JPEG is inherently lossy. The JPEG format uses a compression algorithm that permanently discards some image data to reduce file size .

• PNG is a lossless format. It preserves every pixel exactly.
• JPEG is a lossy format. Even at "100% quality," it still applies compression that can alter the image slightly 

So, while PowerShell can act as a png to jpg converter for Windows, it cannot create a JPEG that is bit-for-bit identical to the original PNG. What you can do is set the JPEG quality high enough (like 90–95%) that the loss is visually imperceptible for most photos and screenshots .