ToolVault

Plain black-and-white QR squares look out of place in a poster or business card. You think: can I add a logo, change colors, make it on-brand?

You can. Here's what you can and can't change in a QR code, and how to make a good-looking one step by step.

How far can QR design go

A QR works via its three finder patterns and error correction. As long as you don't break those, you can safely beautify:

| Changeable | Not changeable (won't scan) | |---|---| | Foreground/background color (keep contrast) | The three finder-pattern squares | | Center logo (needs margin + tolerance) | The quiet zone around finders | | Rounded corners / dot style | Too much data-module occlusion | | Gradient (if contrast holds) | Colors too light for scanners |

Key parameter: Error Correction Level

| Level | Recoverable | Use | |---|---|---| | L | ~7% | Clean screen display | | M | ~15% | Normal printing | | Q | ~25% | With logo | | H | ~30% | Larger logo / outdoor |

Pick Q or H when adding a logo, or the center occlusion breaks scanning.

Step-by-step design

Use this site's QR Code Generator (local, no image host):

1. Open the QR generator.
2. Enter content: URL, text, WiFi, vCard, etc.
3. Select error correction H (room for a logo).
4. Customize:
   • Foreground/background color (keep contrast—e.g. dark blue on white);
   • Rounded corners or dot style;
   • Upload a center logo (transparent PNG, ≤20% of size).
5. Preview scan result live; export PNG/SVG once it scans.

Start from a standard code? The QR generator default config works; to scan an existing QR, use the QR decoder.

Design principles (avoid fails)

1. Contrast first: light foreground + light background = dead. Foreground must be clearly darker.
2. Keep quiet zone: at least 4 modules of blank around the QR—don't bleed to the edge.
3. Logo not too big: ≤15–20% of area, with high error correction.
4. Scan before publishing: real-scan once with a phone before printing.
5. Gradients carefully: solid colors are safest; gradients only if contrast holds.

Common use cases

• WiFi QR: guests connect without typing the password. Format: WIFI:T:WPA;S:name;P:password;;.
• vCard: scan to save a contact.
• Payment / follow: WeChat official account, payment codes.
• Event materials: posters, banners with a jump link.

FAQ

Q: Why won't my colored QR scan? 99% low contrast or occluded finders. Switch to high-contrast solid colors first; beautify after it scans.

Q: Scannable with a logo? Yes—if error correction is Q/H and logo ≤20%. Always verify by real scan.

Q: SVG or PNG? Print/enlarge → SVG (lossless vector); web/chat → PNG (better compatibility).

Q: Capacity limit? Yes. Version 40-H holds ~1700 Chinese chars or ~7000+ digits. Don't stuff long documents in—use a short link instead.

Summary

A good-looking QR = high error correction (H) + high-contrast colors + modest logo + real-scan verify. Use this site's QR generator to design locally—no third-party image host, logo and style under your control. Scan it before you ship.