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QR code renderer in a TrueType font

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In the "Libre Barcode Project" discussion yesterday, 1bpp asked: "Is anyone willing to sacrifice their sanity for the sake of implementing a QR renderer as TTF hinting code?"Yes. I had some tokens to burn and was curious... turns out, it's possible. This was put together by a mix of Gemini, GPT, and Claude (depending on which usage limits kept running out).

HN · launched Jun 28, 2026 · 118 upvotes (top 7%) · 0 views

Niche: typography and font tools · 123 launches, 7 in the last 7 days · Explore this niche →

Category and tags
  • Horizontal
  • Dev tools
  • Developer
  • Not AI
  • Hobby / open-source project

Visit website ↗ Source listing ↗

More like this: all 123 launches in typography and font tools →

Could you build this?

No Implementing a full QR code generation engine inside a TrueType font's hinting bytecode (assembly executed by the rasterizer) is an extreme, highly specialized low-level bytecode hack.

What it would actually take: This requires programming directly in TrueType bytecode instructions (TTF hinting language) to perform bit manipulation, Reed-Solomon error correction, and pixel positioning during font rasterization. Tools involve specialized TrueType table editors (FontTools/ttx) and intimate knowledge of font engine virtual machines (FreeType, Windows DirectWrite). This is an esoteric systems feat requiring rare expertise in vector font VMs and specification-level typography bytecode.

Discussion

18 comments analyzed.

Competitors mentioned: JavaScript QR code renderers, Browser/OS screenshot scanning interfaces

Concerns raised: Security risk from Turing-complete font rendering (remote execution vulnerabilities), File size much larger than JavaScript alternatives, Font rendering complexity creates CVE surface (legacy of Type 1 fonts), Kernel-level font rendering vulnerabilities on Windows

Feature requests: Use reserved characters instead of brackets for QR encoding, Different control sequences to specify QR code sizes, Make QR codes on web pages clickable with URL scheme support, Browser/OS native on-screen QR code scanning interface

Competitors

Other products that read as similar to this one : 178 launches clear the similarity bar, closest 8 shown.

Attention rank: #9 of 179 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).

Launched 233 days after the earliest competitor.

Related data

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