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I built a QR code phishing scanner for our free API — and ended up writing a PNG decoder from scratch to make it work.

** ** The problem QR code phishing ("quishing") is one of the fastest-growing phishing vectors right now — Microsoft's 2026 report puts the year-over-year growth at 146% in Q1 alone, and QR codes now…

  • Developed QR code scanner for Presend's free API to combat quishing
  • Custom PNG decoder implemented from scratch due to lack of built-in support
  • Added 1-bit pixel packing support to handle real-world QR code images

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