• Normally generate QR code across version 1 to version 40.
• Automatically analyze QR version by source text.
• Specifying cell shape allowably with WithCustomShape, WithCircleShape (default is rectangle)
• Specifying output file's format with WithBuiltinImageEncoder, WithCustomImageEncoder (default is JPEG)
• Not only shape of cell, but also color of QR Code background and foreground color.
• WithLogoImage, WithLogoImageFilePNG, WithLogoImageFileJPEG help you add an icon at the central of QR Code.
• WithBorderWidth allows to specify any width of 4 sides around the qrcode.
• WebAssembly support, check out the Example and README for more detail.
• support Halftone QR Codes, check out the Example.

go get -u github.com/yeqown/go-qrcode/v2

link to CODE

package main import ( "github.com/yeqown/go-qrcode/v2" "github.com/yeqown/go-qrcode/writer/standard" ) func main() { qrc, err := qrcode.New("https://github.com/yeqown/go-qrcode") if err != nil { fmt.Printf("could not generate QRCode: %v", err) return	} w, err := standard.New("../assets/repo-qrcode.jpeg") if err != nil { fmt.Printf("standard.New failed: %v", err) return	} // save file if err = qrc.Save(w); err != nil { fmt.Printf("could not save image: %v", err)	} }

const ( // EncModeNone mode ... EncModeNone encMode = 1 << iota // EncModeNumeric mode ... EncModeNumeric // EncModeAlphanumeric mode ... EncModeAlphanumeric // EncModeByte mode ... EncModeByte // EncModeKanji mode ... EncModeKanji ) // WithEncodingMode sets the encoding mode. func WithEncodingMode(mode encMode) EncodeOption {} const ( // ErrorCorrectionLow :Level L: 7% error recovery. ErrorCorrectionLow ecLevel = iota + 1 // ErrorCorrectionMedium :Level M: 15% error recovery. Good default choice. ErrorCorrectionMedium // ErrorCorrectionQuart :Level Q: 25% error recovery. ErrorCorrectionQuart // ErrorCorrectionHighest :Level H: 30% error recovery. ErrorCorrectionHighest ) // WithErrorCorrectionLevel sets the error correction level. func WithErrorCorrectionLevel(ecLevel ecLevel) EncodeOption {}

These samples are generated with standard writer, check out Example for more details.

A	B	C	D
bg-fg color	transparent	border padding	circle shape
fg gradient	using halftone	set logo image	block width
custom shape

• Standard Writer, prints QRCode into file and stream
• Terminal Writer, prints QRCode into terminal
• File Writer, prints QRCode into files
• Compressed Writer, It's generated on a very small scale

Of course, you can also code your own writer, just implement Writer interface.

go-qrcode.v2 is a major upgrade from v1, and it is not backward compatible. v2 redesigned the API, and it is more flexible and powerful. Features are split into different modules (according to functionality).

• github.com/yeqown/go-qrcode/v2 core
• github.com/yeqown/go-qrcode/writer/standard writer/imageFile
• github.com/yeqown/go-qrcode/writer/terminal writer/terminal

Check example/migrating-from-v1 for more details.

• QRCode Tourist
• QRCode Wiki
• 二维码详解 (QRCode analysis in CN-zh)
• 数据编码 (How to encode data payload in QRCode in CN-zh)