Generate high-resolution custom QR codes instantly.
Create crisp, ready-to-scan QR codes for websites, Wi-Fi networks, vCards, SMS, and JSON payloads. Customize color palettes, error correction, and download vector SVG or HD PNG files.
Enter data to generate QR
https://jsonglow.com
JSONGlow's QR Code Generator is a free, privacy-first tool that creates vector SVG and high-resolution PNG QR codes for URLs, Wi-Fi passwords, vCards, and JSON directly in your browser.
Modern Matrix Generation
Vector-quality QR codes engineered in your browser.
Whether you need an instant Wi-Fi login placard for your office, a scannable contact card for a conference badge, or a vector SVG for print packaging, JSONGlow's QR Code Generator gives you pixel-perfect results.
Choose from high-contrast designer color palettes, adjust quiet zone margins, select error correction levels (up to 30% damage recovery), and download in vector SVG or high-res PNG up to 2048px.
Every byte is generated locally with zero network calls, ensuring your private credentials and payloads stay completely secure.
Workflow Guide
How to generate custom QR codes in 3 steps
Choose your payload type
Pick from URL / Website, Wi-Fi credentials, vCard contact card, Email, SMS, plain text, or JSON payload.
Colors & error correction
Select curated color palettes, customize foreground/background hex codes, adjust quiet margins, and set error correction levels.
Ready for print & digital
Download scalable vector SVG for print packaging or high-resolution PNG (up to 2048px) for digital displays.
Core Capabilities
High-performance matrix generator
Scalable Vector SVG
Download vector SVGs that scale infinitely to any print dimension without pixelation or blurriness.
Ultra-HD PNG Export
Export high-resolution raster images up to 2048x2048px at 300 DPI for digital displays and posters.
Multiple Data Presets
Built-in templates for Wi-Fi configurations, vCards, URLs, email templates, SMS, and JSON payloads.
Error Correction Control
Configure Reed-Solomon Error Correction from Low (7%) to High (30%) to resist smudges and damage.
Curated Designer Palettes
One-click color presets like Neon Cyber, Sunset Glow, Forest Emerald, and Minimal Slate.
100% Client-Side Privacy
No server uploads or external tracking. Your Wi-Fi passwords and personal contacts stay strictly local.
Frequently Asked Questions
Common questions answered.
Need more help? Our tools execute entirely in your browser without transmitting any payload to remote servers.
How does the QR Code Generator work?+
The generator creates standard ISO/IEC 18004 QR codes in your browser using pure JavaScript and HTML5 Canvas. It encodes data into a 2D matrix with Reed-Solomon error correction for maximum readability.
Can I download high-resolution QR codes for print?+
Yes! You can download crisp vector SVGs (infinitely scalable without pixelation) or ultra-high-definition PNGs up to 2048px (ideal for billboards, flyers, packaging, and business cards).
What data formats are supported?+
You can generate QR codes for website URLs, Wi-Fi auto-login credentials, contact vCards (address book), email mailto links, SMS/phone triggers, plain text, and JSON data structures.
What is Error Correction Level (ECC)?+
Error correction allows QR codes to be read even if partially dirty, damaged, or obscured. Levels range from Low (7% recovery) to High (30% recovery). Higher levels ensure reliable scanning in physical environments.
Are my QR codes or private Wi-Fi passwords sent to any server?+
Never. All encoding and image generation runs 100% locally in your browser. Zero data or credentials leave your device.
Explore More Tools & Guides
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Convert PNG, JPG, and WebP images to scalable SVG vectors with color quantization and contour tracing.
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Decode Base64URL header & payload, check expiration countdown, and verify HMAC/RSA signatures offline.