QR forever (designer QR codes that never expire) - fotojockovic.com/qr
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Makes static QR codes (and Micro QR codes) in the browser. Nothing is uploaded; no server, no tracking.

1. Our own work, written for this tool (MIT licence):
   - src-rs/ -> qr.wasm: the whole QR engine in Rust, with no third-party crates:
       * encoder for QR Code Model 2, versions 1-40, levels L/M/Q/H, and Micro QR M1-M4: optimal
         segmentation into numeric / alphanumeric / byte / kanji segments by dynamic programming, ECI 26
         (UTF-8) for non-ASCII text, Reed-Solomon over GF(256), block interleaving, module placement,
         all 8 (Micro: 4) masks scored by the ISO/IEC 18004 penalty rules
       * decoder: adaptive binarisation, finder search by 1:1:3:1:1 run ratios with vertical / horizontal /
         diagonal cross-checks, triple selection, version estimate and version-information BCH decoding,
         orientation-aware alignment-pattern search, least-squares homography refined with every alignment
         pattern, module sampling, format information (BCH), Berlekamp-Massey / Chien / Forney Reed-Solomon
         correction with per-block error counts, bit-stream parsing (incl. ECI, kanji, structured append)
       * scan simulation (distance, focus blur, dim light and noise, glare, perspective) for the scan check
       * halftone blending for photo QR codes
   - app.js, render.js (vector renderer: contour tracing, rounded / liquid / classy outlines, module glyphs,
     eyes, frames), export.js (PDF writer with shadings and CMYK, EPS level 3 writer, PNG pHYs, ZIP, CSV),
     font.js (TrueType outline reader), payload.js (content standards), icons.js (our own logo glyphs and an
     SVG path parser), engine.js, worker.js, i18n.js, lang/*.js, index.html, style.css, og.jpg.

2. Standards and published methods used (ideas and specifications only; no code copied):
   - ISO/IEC 18004:2015, QR Code bar code symbology specification (incl. Micro QR).
   - Optimal segmentation idea as described publicly by Project Nayuki ("Optimal text segmentation for QR
     Codes"); our implementation is our own.
   - H.-K. Chu, C.-S. Chang, R.-R. Lee, N. J. Mitra, "Halftone QR Codes", ACM SIGGRAPH Asia 2013 (core
     sub-module idea for photo QR codes).
   - Finder-pattern search in the spirit of the public ZXing description (1:1:3:1:1 ratios, cross-checks).
   - EPC069-12 v2 "Quick Response Code: Guidelines to Enable Data Capture for the Initiation of a SEPA
     Credit Transfer" (European Payments Council).
   - NBS IPS QR code: National Bank of Serbia, "Generator / Validator NBS IPS QR kodova - API" guidelines and
     "Preporuke" (ips.nbs.rs, read 2026-10-16): tags K, V, C, R, N, I, P, SF, S, RO; account and model-97
     checks (ISO 7064 MOD 97-10).
   - SPAYD (Short Payment Descriptor), Czech Banking Association.
   - Wi-Fi network config format (WIFI:T:...;S:...;P:...;;), MeCard, vCard 3.0 (RFC 2426), iCalendar
     VEVENT (RFC 5545), mailto (RFC 6068), tel (RFC 3966), geo (RFC 5870).
   - PDF 1.5 and PostScript Level 3 reference manuals (Adobe), PNG specification (pHYs), ZIP APPNOTE (PKWARE).

3. Fonts (fonts/), SIL Open Font License 1.1 (https://openfontlicense.org), taken from the same subsets used
   by /stars (instanced at one weight, subset to Latin, Latin Extended, Greek and Cyrillic where the family
   has them; renamed files only). Text in exported files is converted to outlines.
      Manrope - Copyright 2018 The Manrope Project Authors (github.com/googlefonts/manrope)
      Montserrat - Copyright 2024 The Montserrat.Git Project Authors (github.com/JulietaUla/Montserrat.git)
      Jost - Copyright 2020 The Jost Project Authors (github.com/indestructible-type)
      Cinzel - Copyright 2020 The Cinzel Project Authors (github.com/NDISCOVER/Cinzel)
      EB Garamond - Copyright 2017 The EB Garamond Project Authors (github.com/octaviopardo/EBGaramond12)
      Great Vibes - Copyright 2015 The Great Vibes Pro Project Authors (github.com/googlefonts/great-vibes)
      DM Mono - Copyright 2020 The DM Mono Project Authors (github.com/googlefonts/dm-mono)
   None of these fonts has a Reserved Font Name.
   Interface fonts Inter Tight and Instrument Serif are loaded from Google Fonts (SIL OFL 1.1).

4. Brand icons in the logo picker (icons.js, BRAND): Simple Icons 13.21.0 (https://simpleicons.org),
   CC0 1.0 Universal. The logos are trademarks of their respective owners; they are offered only so people
   can mark codes that link to their own profiles on those services. No endorsement is implied.

5. Sample pictures for photo QR (samples/*.jpg: square crops, resized). The Metropolitan Museum of Art,
   Open Access, CC0 1.0 (same files as /wall):
     samples/vangogh.jpg - Vincent van Gogh, Wheat Field with Cypresses, 1889, object 436535
     samples/vermeer.jpg - Johannes Vermeer, Young Woman with a Water Pitcher, ca. 1662, object 437881
     samples/legray.jpg  - Gustave Le Gray, Mediterranean Sea - Sete, 1857, object 283124

6. Language flags in the language picker (/static/tools/common/i18n.js): our own drawings.

Build tools (not shipped): Rust / cargo (MIT/Apache-2.0), binaryen wasm optimiser via npm "binaryen"
(Apache-2.0). Testing only (not shipped): zxing-cpp (Apache-2.0) was used to cross-check our encoder and
decoder; Puppeteer (Apache-2.0) for browser tests.

Self-hosted web fonts (2026-10-19): Inter Tight, Instrument Serif. SIL Open Font License 1.1. The woff2 files are the ones Google Fonts
serves (latin, latin-ext, cyrillic, greek subsets where the family has them), stored on our own server under
/static/tools/common/fonts/<family>/ with each family's licence text (OFL.txt) next to them; stylesheet
/static/tools/common/fonts/ui.css. No font request goes to Google.