Vector graphics

• How to Use Xfig Graphics and LaTeX Together
  Use Xfig's combined graphic-and-LaTeX export to keep labels in TeX; understand the limits when importing arbitrary TeX into editable Xfig objects.
• How to Create a Vector QR Code in LaTeX
  Create a scalable QR code directly in LaTeX with the qrcode package, or use PSTricks for other barcode types and vector output.
• Why Are Vector Images Rasterized in XeLaTeX PDFs?
  Keep figures sharp in XeLaTeX by including vector PDFs, converting SVG or EPS appropriately, and checking whether the final PDF contains bitmap images.