Use an AI image upscaler
Resize with bicubic or Lanczos interpolation
Increase resolution in Photoshop or similar editor
Sharpen after upscaling
Reduce noise before enlarging
Start from the highest-quality original file
Use vector graphics if the image is a logo or illustration
Re-export at a higher DPI for print
Avoid repeated saving in lossy formats
Retake or rescan the image at a higher resolution