You can download your QR Code in 5 different formats:
To download the QR Code in a custom size or change the error correction level, click on 'Custom'. You will see this pop-up
Size of the QR Code
To change the size, click on the arrow and you'll see 4 different size options - 515 x 512 px, 1024 x 1024 px, 2048 x 2048 px and 4096 x 4096 px:
Error Correction Level in the QR Code
To change the error correction, click on the arrow to reveal 4 different levels - Low, Medium, High, Highest
Make sure you choose the right file type - PNG, EPS, SVG, PDF or JPG and hit 'Download'