Using PowerShell to Save a Base64 String as a File

I recently needed to save a base64 image string back as a file on my PC. Yes, I have all the code to do so here, and in demo databases, but I decided to go the PowerShell route as it is simpler for a the one off situation I was in. Don’t get me wrong, it can be done in VBA and I’ve provided the code to do so here already, but PowerShell, as you will see momentarily, makes it much simpler to accomplish.

As such, I thought I’d simply share the code should anyone else need to do so.

The basic concept is:

$base64 = '...'; #base64 string to save as a file
$saveAs = '...'; #fully qualified path and filename to save the base64 string as

[IO.File]::WriteAllBytes($saveAs, [Convert]::FromBase64String($base64));

a concrete example would be:

$base64 = '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';
$saveAs = 'C:\Temp\Logo.png';

[IO.File]::WriteAllBytes($saveAs, [Convert]::FromBase64String($base64));

after running, you will end up with an image named Logo.jpg in your C:\Temp folder.

If we want to create a reusable function we could easily do so by doing:

function SaveBase64ToFile {
    param (
        [string]$base64,
        [string]$saveAs
    )

    [IO.File]::WriteAllBytes($saveAs, [Convert]::FromBase64String($base64));
}

and we’d call it by doing:

SaveBase64ToFile -base64 'iVBORw0KGgoAAAANSUhEUgAAANgAAAAuCAYAAABK69fpAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAyhpVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuNi1jMTMyIDc5LjE1OTI4NCwgMjAxNi8wNC8xOS0xMzoxMzo0MCAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZXNjcmlwdGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wTU09Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9tbS8iIHhtbG5zOnN0UmVmPSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAvc1R5cGUvUmVzb3VyY2VSZWYjIiB4bWxuczp4bXA9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC8iIHhtcE1NOkRvY3VtZW50SUQ9InhtcC5kaWQ6QTAwQkM2Mzk4NDBBMTFFNjhDQkVCOTdDMjE1NkM3RkQiIHhtcE1NOkluc3RhbmNlSUQ9InhtcC5paWQ6QTAwQkM2Mzg4NDBBMTFFNjhDQkVCOTdDMjE1NkM3RkQiIHhtcDpDcmVhdG9yVG9vbD0iQWRvYmUgUGhvdG9zaG9wIENDIDIwMTUuNSAoV2luZG93cykiPiA8eG1wTU06RGVyaXZlZEZyb20gc3RSZWY6aW5zdGFuY2VJRD0ieG1wLmlpZDpBMkM5MzFBNDcwQTExMUU2QUVERkExNDU3ODU1M0I3QiIgc3RSZWY6ZG9jdW1lbnRJRD0ieG1wLmRpZDpBMkM5MzFBNTcwQTExMUU2QUVERkExNDU3ODU1M0I3QiIvPiA8L3JkZjpEZXNjcmlwdGlvbj4gPC9yZGY6UkRGPiA8L3g6eG1wbWV0YT4gPD94cGFja2V0IGVuZD0iciI/PgQJy/MAAAxESURBVHja7FwNlFVVFT6PN8MMM8AIjPxomEyggCYgajIaguCkaC5AEocif9CIiLLyp9IMC9NgVRqrGpMSwcFSIs3URHERJoJCSlIgMQk0YCS/MjAww8zrbO/36rz99rnvzpt3Z6Z551trL5hz3z3n3HPO/t/3Rg6NL6lXIeCWXhfk0r99Ji05Hkb/IxojI8vK6lfbrk+fPl05OLQ2OrglcHBwDObg4BjMwcHBMZiDg2MwBwfHYA4ODr7IaW8PNOfliNryeKnqpM50u+vQXJRoGqlpmKZiTUc0HdT0hKa1Wclg+9/urWqqe6pOPf8vpjtYU39Nb4Mc2g6+oukWTSdZLL/sZLDDu4tU/ZE82+VZmko1NQgL9oymymYMPUTT7ZoaWXtU0wuafmm00QS/p+kLmvIhGedpmu3OdauDCiR+gLNiw7GsNRE75DSqSIeY7fJYTVdarp2u6TeajqY5NDFXueXaUcZgozV91fi7QNNdml7U9Cd3xlsVs1IwV1xAZieDpYCf5DlD0wWaVqTRbz9Nl/hcr2N/jxJ+E8H4jsFaD700fVFo365pIfwvcu7/xq53hWV0tqalmrZkK4OlkkrXpMlgE+EEB8V6S/tf3Ta0KiiYcSpre1fT5WxvOkAgfkLTJAjG09D+sslgLkyfiAlNZJQ4Y05t4j2/1/QQa7tf0x/cFrQqBoFxTDwpCD7ysztqukfTNE0DwUs13L93GiwRPTRN0fTjJtxThgBHU1CraYamRzSdrOmfmtZoirktaFU0Cm1vNMH0z3ofLAhI5T+ogkeKbhA2KYhlQJLuFbfcbZ7B6n32L2ZpdwwG7NB0GKZBHOdqGqqC5TnINLiIta1IEfDgdnwcMcsGSyhSXn6mGHtI972vaZem3QHHihkHpLumPvh/NZx5G05AMID+LcAB3K/pPU3/TmMPOmk6BX1SSuM4xv9XE/ujQENvzKsQ/dC89qCvVPvQgPE5cvFvlK1frkWQJvw+2xmMwucLNX3faKO81OSADEZBkW7G3xs1PRuAwegw/QSMorDBFJn6cgozcQhMy3OUV2XQjUnarZr+oulhTc8bG/5d3BMzJPUEHJA7NV2K/mJ4bko37GVjj0H7UAQCehjXDoExyZz6tabfBVg7YuqZCBQMZP1RXnAb5vINi9CI43xN12oarrxorulD12BemzUtUV4FBmfue5UXGazHGnDcrLwgVg5jsCjmzfv7oaZ9uB7Jdgaj518OM+90ZibehQ2yoQAba4LyaDsDjFuIyFS+0XYiGC1mOYxzNF3P7uGScxCIDtpKmLnERBTlupD9/sOafqqSUwbn4qDEQZryATBk1DJ2F2PscgQGvqbpHcvvidkpL/hRn7UdDJpvYbBiY006WvrpDCYgGg/rgnJcm4z9vwhCw4b4PIIgivVLUI/ZDNqYKhwIE30htfxwhUoM6RIzPi5EoWy2PmfeI5bfUtHXUmiu/IDPFROCKnys+5Scj6s17ieN+RIETjTg2BEw43ImtOIgbbHMh7lMHLOYzb2wJtN9mEvCGGj2YQHWPSPIdgaL4OBUCs7sZJ9DRe3Xsbb1MPMKMqxhf6a8yg8J+2CWvpXCjJI0xJU+QqcePs3DFiZR0E5kjm63XKcaywWGGRxftzkQYDwa9xLM6xWGeZonCCxqe0TwfePYjnnZtGdfCMJijFsYtomU7cjHAaV6wXFG+2iYBm8J9wwTDv2CEOY2zaJJKaw/D1piHzQOOffnKa9ANa8JwvN5+Ey1eN5SaI3bmKSP42n4GVW4pwD+z23wh0xcCC0zF3+XwFzlUbcvwWSsh6lbAu06Q2CwuN/GQRHZu5VXNH0EZu5H4GOOEZifinnvgKDsargGvEyK5v6MRRA9wMzHWqz/xv8yWPzrT2Hh3aVT0mbiiopFTb6nIT0tpiCtxzGHdaKFwa5h5to2I6iQKXTHAeDYAH9iG2vfgyAHMcDFKlhObTYOJT84A5Rcj0fpi88L7Tvg8y0TzM6bNP1c0wFNH1LJify16NcM1sTfLljErIhuYEaOF2Bx7BcE0ToEOD7Jrt2AQNObzN/iIG24yrJ+fDyKXK42+2x3JmLj3/Ue5qb1pbiVKvmVkc+o5MLOIjCYid8qL0ydSVwmmFLkt00VmEuxiN5TKnXRMh2a7wjtdZD4XVn7VkT0lM9hmyH4NKQtzjKEGWf8bsJYpkYwfdUyBGdMvAdm2W/powbz4vvTG9qam5+ShSMhT3AhItxFyFkwcn5DGAf9xlWzPhi8YuKSurQ7Wb7EfklFRknfRbxiQLWav+vEdEbbA0b5utHWDwf9Saa9TmaOeGUIS3ip0PaQRaOmgwU+Wk7ybxb6HOI4NkNQjWPtI8DQVNf3PvPLKPL4nPKitqnqQKWgDEVuq1PctxN7eBNrH4tgiQtyhGgimlikEstfSEhcbawTmU9T2D2vKnvxbrrIRbTNBDFDpmoV4/kuG3h+h3yyNQH7flVoiyfyqyzjlsLPIQYrhz8pYbBFEwfB60LbSWGfR1fsm4hNsOdNXG6YauT0f0xgykzjBJWYRI5r2OoM9d/oo41Iu3QRzMaDAfuWoopRo59vKa96RjK5Loa/RO/FfVYwvwqF5wgaPd0ltJ3iGKzlsUAl5l66woEmXMvs9G0qnAp4qWzqqErOZ4Wx95SczWnGWWmwPE8crykvT+b3ag5FJSkUP9dgziLBV2tUwcvLpJRLgWOwlgdJT/5C3VXKSypfleQKen5FphFRyeHpQhVyzgY4LvhmERW80r9TgN+QlUBpjtnKi/TZcKv6X9TwkEXzRZrxrNWOwVoeNYLjS5EwKisqZlL5FyHNoVbQBN1bwqRRXoHtQcF8C/qe3AChTSq2pagepQjoTfLPKS+cLoG+W9IT68EjlDkq+QVJG/oHNGcdg7UAHmXmGPlDl7H1WgVzJywmlzZ/Ugs8OwmOrUJ7WcDzJEU/1/ncQ5qJoqOUGpgnmHyUdD4N/98s3H9JwOcaK7S9FsLaxRyDpcY/lPfWsZ8ZsjjkOSwX2iiCWdoCwvNpoW1qAA1KTHiWwECvBJgThe+pGmSt8BwFhvnOQcUA56eY1wiBwSi9sroZa9QgCIMc7us5BrNLokofB3q7Cv/1/idUckEwmWqPQZsqi9P+aQRq8poxNvlIe1hbDwQeSnwO8YOCMHrU8FM/DvN7UAofkO9F3PeiMP47wprQ8w6z9EftVKWTKwiwjc30VQ8I/ucYznEO9kNGSd0hlms7Qx6ftCh9n+/brJ20yLNgNPrAShWk5lAwHh3iDSp4dE3CNuWVN32TtY/S9EeM/QYCFKdCg0xRyamFvczsy0OgiOZJCWIq8H0Tfh8l9amciadBdhhMRb+jOsj57DdngPkoxL8G8+8L5qJwfy/Bx71HNTttKqYIbgZf0ToNdAxmxxFosSGCRF3cQnOgV0rOVMnRS0I5qA5aI5cdoOaCXkQ8TzCtqJ7wVmONCnxMqFlM4zQamnYqiAIqlILoYumL8oxmDqsCQuRq9jti7pkgv3nR/t2hAn6ZNwWoOuR61kY5zDuxRnnORPTHYyo5okYSsqW+XUgH7zrllXDZ0FEwfzKR36mB9PcrYi7w8aemYf1MSLmoImgYqS8yw+cKphnVHv4qjXkdg4b5UYb25zkfRs1rlz5YLBbxS9h0FqSN3xqQGchfVahMYX5Jvk+h4LjzcqCuPgf9U8p7vSLI9+spqLBSJZZ8dREOepC9J9+JXiy9PeDYtfCxRsJf49inguUNyfSi98bGK/mt8sMwSamIN8i3JOuxJlSV4/fFsPyA+2n2e6NKrMhX7doH65jToKIRK4vRtykWMjNwb4pgB6n7pwyzJ1VBKkn8yaytSjhAk9jm7VX2ZC6Nez80Ah1ees+K6vK64x7SdFvge1HEbh07BMQgvdlz7Q+4pMehRYhhRiOYQS9h9oSgOYbno0O2WvnXLK5HH2fD9Ka3mvsY/WyEb0f+y6YAgagKBIOoxGo4668OPuKfsSarA/ily4Qgyusp7qE5U2piAnzUAUZgZkMkWnmg7VbT+8BWTd/wYgc1c/FYFcvv197N14hhcjWlZChTyDEOekMb6Ces/tId/4M9aXcmYjQaU+XnbM4G/zAG7XK8FZhLGWM3tJF+wuov3fEb26UPRss6vP9u5eDQFtD+GEzLjc6d69zOOjgGCw21bmMdHIM5ODgGc3BwcAzm4NAm8R8BBgAGrc+T79nGEQAAAABJRU5ErkJggg==' -saveAs 'C:\Temp\Logo.png'

This function would be useful if you wanted to automate a web scrapping process for instance.

But as you can see, with PowerShell we can save a base64 string as an image file with merely 3-4 lines of code! Heck, if you truly wanted to, you could combine it all into a single line:

[IO.File]::WriteAllBytes('C:\Temp\...', [Convert]::FromBase64String('iVBOR...'));

Not very complex once you know how it is done. Hopefully this will be useful to a couple people out there.