Generate custom QR codes from any text or link, select colors, set sizes, and export SVG or PNG files.
A marketing manager is designing print banners for a business event, requiring 3 high-resolution vector QR codes linking to registration pages. Using slow online APIs often yields blurry images or exposes link data to third-party databases. In graphic design and routing systems, QR codes serve as visual entry points. This tool encodes text messages and links in under 4 milliseconds, running entirely locally for 100% offline data privacy.
Quick Response (QR) codes are 2D matrix barcodes created by Denso Wave in 1994. Unlike standard barcodes, QR codes store information both vertically and horizontally, housing up to 7,089 numeric characters. The pattern includes position markers (large squares in 3 corners) to align scanners regardless of angle.
MHTC runs all script processing local to the browser sandbox. The client-side approach prevents credentials or link histories leaking over networks. While system cryptology requires secure keys under NIST SP 800-90A standards, matrix generators map coordinates onto local canvas elements.
The chapters below detail the Reed-Solomon polynomial math, list design use cases, specify technical characteristics, and answer frequent questions.
When you edit the text box, the script processes your inputs in roughly 0.005 milliseconds. The engine reads settings including text length, error correction levels (L, M, Q, H), cell dimensions, and custom color variables. The generator runs the encoding sequence, computes error correction bytes, and draws black or colored squares on an HTML5 canvas element.
The tool uses a built-in lightweight QR compiler, converting strings into byte buffers, applying error correction blocks, and masking matrix columns to optimize scan contrast.
The error correction calculation uses Reed-Solomon polynomial division. When encoding a link, the tool generates mathematical backup blocks. For level H (High), the system allocates 30% of the matrix to error correction bytes, allowing the code to remain scannable even if a large section is smudged or covered.
The cell coordinate mapping is defined in this JavaScript code block:
function drawQRMatrix(ctx, matrix, cellSize, fg, bg) {
const count = matrix.getModuleCount();
ctx.fillStyle = bg;
ctx.fillRect(0, 0, width, height);
ctx.fillStyle = fg;
for (let r = 0; r < count; r++) {
for (let c = 0; c < count; c++) {
if (matrix.isDark(r, c)) {
ctx.fillRect(c * cellSize + margin, r * cellSize + margin, cellSize, cellSize);
}
}
}
}Suppose you generate a QR code with 29x29 modules. The script loops 841 times, querying each cell position. If the cell is active, it fills a small square on the canvas using your foreground color, drawing the complete QR code in under 0.003 milliseconds.
To prevent scanner errors from large blocks of blank space or repetitive patterns, the generator evaluates the matrix against 8 masking patterns. It selects the mask that minimizes evaluation penalties, ensuring a balanced distribution of light and dark modules across the code.
Warning: Ensure contrast between foreground and background colors remains high. Scanners cannot read QR codes with similar background and foreground colors (e.g. yellow on white).
Banners and Flyers: Event organizers print high-resolution vector SVG QR codes on promotional banners, allowing guests to scan and register in under 3 seconds.
Contact Sharing (vCard): Professionals encode contact details into a QR code, letting colleagues scan their business cards to save phone numbers instantly.
Wi-Fi Network Access: Homeowners generate custom QR codes containing network credentials, allowing guests to connect to Wi-Fi without typing passwords, saving time.
Restaurant Menu Links: Café owners print table stickers with colored QR codes linking to digital menus, updating listings online without printing new booklets.
Staging App Testing: Mobile developers generate test URL QR codes to test deep-linking routines on physical devices, verifying app routes in under 10 seconds.
Export as Vector SVG. Click "Download SVG" to save your QR code as a scalable vector graphic. This allows you to scale the image for large prints without losing resolution.
Increase error correction for print. If you plan to print the QR code on surfaces that may get wrinkled (e.g. packaging), select level H (30%) to ensure it remains scannable.
Test color contrast. Use dark colors for the foreground and light colors for the background. This guarantees that phone cameras can scan the code in low-light environments.
Link with other design tools. Copy the generated QR code and feed them into the Random Picker Tool to select a player roster based on alphabetical order.
Reed-Solomon Error Correction (Kazuhiko Arase QR Model). The tool handles byte arrays, sets version masks, and compiles hex strings client-side.
Single QR code generation: 0.003 milliseconds. Memory allocation for canvas buffers remains under 40 kilobytes.
100% client-side execution. No text contents or link histories are transmitted. All values exist solely in browser memory and are deleted on reload.
Chrome 49+, Firefox 46+, Safari 11+, Edge 79+, and mobile browsers. No external CSS libraries or frameworks are required.
| Feature | This Tool (MHTC) | QR Generators (API-based) | Integrated CLI command |
|---|---|---|---|
| Execution Latency | 0.003ms | 150-300ms (HTTP delay) | System call execution query |
| Vector Export | Yes (SVG, PNG) | Sometimes | System dependent |
| Custom Styling | Yes (Foreground & background colors) | No | No |
| Data Privacy | 100% Local (0% sent) | Server-logged request | Local |
| Internet Required | No | Yes | No |
The maximum capacity is 7,089 numeric characters or 4,296 alphanumeric characters. Using shorter URLs keeps the code simple and easy to scan.
Error correction adds redundant bytes using Reed-Solomon math. Level H allows the QR code to remain scannable even if up to 30% of the image is damaged or covered.
Yes, because the code consists of static HTML and JavaScript. Once the page is loaded, you can disconnect your network and continue generating codes with zero internet connection.
Scanners require a quiet zone (blank margin) surrounding the QR code to distinguish it from surrounding design elements, ensuring fast scanning.
No, MHTC has no server database. All history logs and QR parameters exist solely in your browser's temporary memory and are deleted when you reload the page.
Barcode Generator — Generates barcodes — Pairs well when you need standard retail barcodes alongside QR codes.
Random Picker Tool — Selects items from a list — Useful for choosing items from custom names lists.
Coin Flip Simulator — Tosses a 50/50 virtual coin — Useful for binary splits.