Custom QR Code Generator with Colors & Center Logo
Generate high-resolution PNG/SVG QR codes with custom foreground/background colors, dot patterns, corner squares, and center logos. All rendering and cryptographic operations run 100% locally in your browser.
1. Content & Data Format
2. Colors & Gradient Palette
3. Dot Patterns & Corner Squares
4. Center Logo & Branding
5. Error Correction (ECC) & Quiet Zone
Live Vector Preview
Your Wi-Fi passwords, contact cards, private links, and uploaded logo files never touch any external server. All QR computations and image rasterizations run inside your browser.
How Custom QR Code Styling Works Without Breaking Scannability
1. Finder Pattern Anchors
The three 7×7 module squares in the corners allow phone cameras to detect orientation and grid skew. Styling them with rounded corners preserves their distinctive 1:1:3:1:1 geometric ratio.
2. Reed-Solomon Redundancy
QR codes use Reed-Solomon error correction. With Level H (High), up to 30% of the surface area can be covered by a center brand logo without losing any encoded data.
3. Contrast & Luminance
Camera sensors convert the image to binary black-and-white pixels. Maintaining a contrast ratio above 4.5:1 ensures instant decoding even in dim lighting or glare.
Frequently Asked Questions (FAQ)
Can custom colored QR codes with dots and logos be scanned by any smartphone?
Yes. All modern iOS and Android native camera apps, as well as third-party barcode scanners, follow the standard ISO/IEC 18004 QR specification. As long as you maintain sufficient color contrast and use Error Correction Level H when adding a logo, your styled QR code will scan seamlessly.
Should I download PNG or SVG for printing on packaging, flyers, or banners?
For print media (signage, business cards, billboards, t-shirts, packaging), SVG is strongly recommended because it is a vector format that scales infinitely without pixelation or blurriness. For digital use on websites, social media, or slide decks, a 1024px or 2048px PNG is ideal.
Why is Level H (30%) Error Correction necessary when adding a center logo?
Placing a logo in the center physically covers data modules in that area. Level H provides up to 30% data recovery capacity through Reed-Solomon algebraic codes. This allows the scanner to reconstruct any obscured bits effortlessly.
Are my input data, passwords, or uploaded logos stored on your server?
No. ToolsAA is built on a strict privacy-first architecture. All cryptographic and matrix transformations, SVG generation, and canvas downloads run 100% on the client side in your web browser. Zero bytes are ever transmitted to any external server.
How does transparent background work with QR codes?
When you export a QR code with a transparent background, the white background modules are replaced with transparent pixels. Make sure the surface or background color you place the QR code on provides high contrast against the QR foreground dots.