Start with the highest-resolution original file available
Use a photo editor with AI upscaling or super-resolution
Increase image size gradually instead of all at once
Preserve aspect ratio while resizing
Use a high-quality resampling method such as Lanczos or bicubic smoother
Sharpen the image after resizing
Reduce noise before upscaling
Export in a lossless or high-quality format such as TIFF or PNG
Avoid repeated saving in compressed formats
Use RAW files when possible
Retake the photo with a higher-resolution camera if the original is too small
Improve lighting and focus before capturing a new image
Use a tripod to reduce blur
Keep the subject well framed to allow cropping without losing detail