QR code generator browser extension — side panel UI, share links, embed snippets and offline preview.

• Side panel UI — always accessible, doesn't block the page
• Instant preview — QR generated locally via uqr, no network needed
• ~5 KB SVGs — run-length encoded, single <path>, integer coordinates
• Share links — canonical URLs at qr.qrcgen.com with CDN edge caching
• Embed snippets — HTML, Markdown, React, Vue formats
• History — recent QR codes stored locally
• Dark & light theme — with auto-detection
• 2 languages — English, Russian
• Fully local — no accounts, no tracking, no data leaves your browser

1. Click the extension icon — side panel opens with a QR code for the current page
2. QR matrix generated locally with uqr — instant, offline
3. SHA-256 hash computed locally (same algorithm as the API worker)
4. Canonical URL built deterministically — no API call needed
5. Background worker warms the CDN edge cache (fire-and-forget)
6. Copy share link, download SVG, or grab an embed snippet

git clone https://github.com/investblog/qrgen.git
cd qrgen
npm install

npm run dev            # Chrome dev build with HMR
npm run dev:edge       # Edge dev build
npm run build          # Chrome production
npm run build:all      # Chrome + Edge production
npm run zip:all        # Distribution archives
npm run check          # typecheck + lint + test

• WXT ^0.19 — web extension framework with HMR
• TypeScript ^5.7
• uqr — QR matrix generation (zero deps)
• Vanilla DOM — no React/Vue runtime
• Biome — linter & formatter
• Vitest — test runner (32 tests)
• Chrome MV3 + Edge MV3 builds

QRCGen runs entirely in your browser. QR codes are generated locally — no data is sent for preview. The only network request is an optional cache-warming fetch to qr.qrcgen.com so share links load instantly for recipients. No accounts, no tracking, no analytics.

• qr-generator — Cloudflare Worker API at qr.qrcgen.com
• qrcgen.com — web UI & documentation
• API docs — endpoint reference
• Extension guide — user documentation

MIT

Built by investblog with Claude