How do I convert HEIC files to JPEGs in Windows?

Developer Option — Bulk Conversion Using PowerShell

If you need to convert multiple .heic files (for example, an export from an iPhone), you can do this using PowerShell and Windows’ built‑in imaging libraries.

Update the folder paths as required:

Add-Type -AssemblyName System.Runtime.WindowsRuntime
$null = [Windows.Storage.StorageFile, Windows.Storage, ContentType = WindowsRuntime]
$null = [Windows.Graphics.Imaging.BitmapDecoder, Windows.Graphics.Imaging, ContentType = WindowsRuntime]
$null = [Windows.Graphics.Imaging.BitmapEncoder, Windows.Graphics.Imaging, ContentType = WindowsRuntime]

$sourceFolder = "C:\Path\To\HEIC"
$destinationFolder = "C:\Path\To\Output"

Get-ChildItem $sourceFolder -Filter *.heic | ForEach-Object {

    $inputPath = $_.FullName
    $outputPath = Join-Path $destinationFolder ($_.BaseName + ".jpg")
}