二维码生成器

纯本地生成 · 不上传服务器 · PNG / SVG 可下载
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输入内容后点「生成二维码」

怎么生成二维码

  1. 1输入内容粘贴网址链接或任意文字
  2. 2选参数挑输出尺寸与纠错等级
  3. 3即时生成点一下按钮，右侧立刻出码
  4. 4下载保存PNG 适合分享，SVG 无限放大

什么场景会用到

个人名片把手机号/微信/主页链接做成码，扫码即存
菜单/海报印刷 1200px 高清出图，扫码直达点单页
活动签到报名表单链接变成码，现场扫码即填

常见问题

生成的二维码会过期吗？

不会。二维码本身只是内容的图形编码，不经过任何中间服务器，只要被编码的网址/文字还在，码就永远有效。

纠错等级怎么选？

M 是日常推荐；如果二维码要印在可能被磨损、遮挡的地方（包装、户外海报），选 Q 或 H——纠错越高越容易扫出来，但码会更密。

内容太长会失败吗？

二维码有容量上限（约 4000 个数字 / 1800 个拉丁字符 / 900 多个汉字），过长会提示无法生成；网址建议用短链接，码更简洁好扫。

PNG 和 SVG 有什么区别？

PNG 是位图，适合微信/朋友圈分享和网页使用；SVG 是矢量，放多大都不糊，适合印刷和后期编辑。都在浏览器本地生成，内容不上传。

相关工具：图片批量压缩批量改图片尺寸图片格式转换证件照换底色九宫格切图长图切分图片转PDF

: return 37; case '%' : return 38; case '*' : return 39; case '+' : return 40; case '-' : return 41; case '.' : return 42; case '/' : return 43; case ':' : return 44; default : throw 'illegal char :' + c; } } }; return _this; }; //--------------------------------------------------------------------- // qr8BitByte //--------------------------------------------------------------------- var qr8BitByte = function(data) { var _mode = QRMode.MODE_8BIT_BYTE; var _data = data; var _bytes = qrcode.stringToBytes(data); var _this = {}; _this.getMode = function() { return _mode; }; _this.getLength = function(buffer) { return _bytes.length; }; _this.write = function(buffer) { for (var i = 0; i < _bytes.length; i += 1) { buffer.put(_bytes[i], 8); } }; return _this; }; //--------------------------------------------------------------------- // qrKanji //--------------------------------------------------------------------- var qrKanji = function(data) { var _mode = QRMode.MODE_KANJI; var _data = data; var stringToBytes = qrcode.stringToBytesFuncs['SJIS']; if (!stringToBytes) { throw 'sjis not supported.'; } !function(c, code) { // self test for sjis support. var test = stringToBytes(c); if (test.length != 2 || ( (test[0] << 8) | test[1]) != code) { throw 'sjis not supported.'; } }('\u53cb', 0x9746); var _bytes = stringToBytes(data); var _this = {}; _this.getMode = function() { return _mode; }; _this.getLength = function(buffer) { return ~~(_bytes.length / 2); }; _this.write = function(buffer) { var data = _bytes; var i = 0; while (i + 1 < data.length) { var c = ( (0xff & data[i]) << 8) | (0xff & data[i + 1]); if (0x8140 <= c && c <= 0x9FFC) { c -= 0x8140; } else if (0xE040 <= c && c <= 0xEBBF) { c -= 0xC140; } else { throw 'illegal char at ' + (i + 1) + '/' + c; } c = ( (c >>> 8) & 0xff) * 0xC0 + (c & 0xff); buffer.put(c, 13); i += 2; } if (i < data.length) { throw 'illegal char at ' + (i + 1); } }; return _this; }; //===================================================================== // GIF Support etc. // //--------------------------------------------------------------------- // byteArrayOutputStream //--------------------------------------------------------------------- var byteArrayOutputStream = function() { var _bytes = []; var _this = {}; _this.writeByte = function(b) { _bytes.push(b & 0xff); }; _this.writeShort = function(i) { _this.writeByte(i); _this.writeByte(i >>> 8); }; _this.writeBytes = function(b, off, len) { off = off || 0; len = len || b.length; for (var i = 0; i < len; i += 1) { _this.writeByte(b[i + off]); } }; _this.writeString = function(s) { for (var i = 0; i < s.length; i += 1) { _this.writeByte(s.charCodeAt(i) ); } }; _this.toByteArray = function() { return _bytes; }; _this.toString = function() { var s = ''; s += '['; for (var i = 0; i < _bytes.length; i += 1) { if (i > 0) { s += ','; } s += _bytes[i]; } s += ']'; return s; }; return _this; }; //--------------------------------------------------------------------- // base64EncodeOutputStream //--------------------------------------------------------------------- var base64EncodeOutputStream = function() { var _buffer = 0; var _buflen = 0; var _length = 0; var _base64 = ''; var _this = {}; var writeEncoded = function(b) { _base64 += String.fromCharCode(encode(b & 0x3f) ); }; var encode = function(n) { if (n < 0) { // error. } else if (n < 26) { return 0x41 + n; } else if (n < 52) { return 0x61 + (n - 26); } else if (n < 62) { return 0x30 + (n - 52); } else if (n == 62) { return 0x2b; } else if (n == 63) { return 0x2f; } throw 'n:' + n; }; _this.writeByte = function(n) { _buffer = (_buffer << 8) | (n & 0xff); _buflen += 8; _length += 1; while (_buflen >= 6) { writeEncoded(_buffer >>> (_buflen - 6) ); _buflen -= 6; } }; _this.flush = function() { if (_buflen > 0) { writeEncoded(_buffer << (6 - _buflen) ); _buffer = 0; _buflen = 0; } if (_length % 3 != 0) { // padding var padlen = 3 - _length % 3; for (var i = 0; i < padlen; i += 1) { _base64 += '='; } } }; _this.toString = function() { return _base64; }; return _this; }; //--------------------------------------------------------------------- // base64DecodeInputStream //--------------------------------------------------------------------- var base64DecodeInputStream = function(str) { var _str = str; var _pos = 0; var _buffer = 0; var _buflen = 0; var _this = {}; _this.read = function() { while (_buflen < 8) { if (_pos >= _str.length) { if (_buflen == 0) { return -1; } throw 'unexpected end of file./' + _buflen; } var c = _str.charAt(_pos); _pos += 1; if (c == '=') { _buflen = 0; return -1; } else if (c.match(/^\s$/) ) { // ignore if whitespace. continue; } _buffer = (_buffer << 6) | decode(c.charCodeAt(0) ); _buflen += 6; } var n = (_buffer >>> (_buflen - 8) ) & 0xff; _buflen -= 8; return n; }; var decode = function(c) { if (0x41 <= c && c <= 0x5a) { return c - 0x41; } else if (0x61 <= c && c <= 0x7a) { return c - 0x61 + 26; } else if (0x30 <= c && c <= 0x39) { return c - 0x30 + 52; } else if (c == 0x2b) { return 62; } else if (c == 0x2f) { return 63; } else { throw 'c:' + c; } }; return _this; }; //--------------------------------------------------------------------- // gifImage (B/W) //--------------------------------------------------------------------- var gifImage = function(width, height) { var _width = width; var _height = height; var _data = new Array(width * height); var _this = {}; _this.setPixel = function(x, y, pixel) { _data[y * _width + x] = pixel; }; _this.write = function(out) { //--------------------------------- // GIF Signature out.writeString('GIF87a'); //--------------------------------- // Screen Descriptor out.writeShort(_width); out.writeShort(_height); out.writeByte(0x80); // 2bit out.writeByte(0); out.writeByte(0); //--------------------------------- // Global Color Map // black out.writeByte(0x00); out.writeByte(0x00); out.writeByte(0x00); // white out.writeByte(0xff); out.writeByte(0xff); out.writeByte(0xff); //--------------------------------- // Image Descriptor out.writeString(','); out.writeShort(0); out.writeShort(0); out.writeShort(_width); out.writeShort(_height); out.writeByte(0); //--------------------------------- // Local Color Map //--------------------------------- // Raster Data var lzwMinCodeSize = 2; var raster = getLZWRaster(lzwMinCodeSize); out.writeByte(lzwMinCodeSize); var offset = 0; while (raster.length - offset > 255) { out.writeByte(255); out.writeBytes(raster, offset, 255); offset += 255; } out.writeByte(raster.length - offset); out.writeBytes(raster, offset, raster.length - offset); out.writeByte(0x00); //--------------------------------- // GIF Terminator out.writeString(';'); }; var bitOutputStream = function(out) { var _out = out; var _bitLength = 0; var _bitBuffer = 0; var _this = {}; _this.write = function(data, length) { if ( (data >>> length) != 0) { throw 'length over'; } while (_bitLength + length >= 8) { _out.writeByte(0xff & ( (data << _bitLength) | _bitBuffer) ); length -= (8 - _bitLength); data >>>= (8 - _bitLength); _bitBuffer = 0; _bitLength = 0; } _bitBuffer = (data << _bitLength) | _bitBuffer; _bitLength = _bitLength + length; }; _this.flush = function() { if (_bitLength > 0) { _out.writeByte(_bitBuffer); } }; return _this; }; var getLZWRaster = function(lzwMinCodeSize) { var clearCode = 1 << lzwMinCodeSize; var endCode = (1 << lzwMinCodeSize) + 1; var bitLength = lzwMinCodeSize + 1; // Setup LZWTable var table = lzwTable(); for (var i = 0; i < clearCode; i += 1) { table.add(String.fromCharCode(i) ); } table.add(String.fromCharCode(clearCode) ); table.add(String.fromCharCode(endCode) ); var byteOut = byteArrayOutputStream(); var bitOut = bitOutputStream(byteOut); // clear code bitOut.write(clearCode, bitLength); var dataIndex = 0; var s = String.fromCharCode(_data[dataIndex]); dataIndex += 1; while (dataIndex < _data.length) { var c = String.fromCharCode(_data[dataIndex]); dataIndex += 1; if (table.contains(s + c) ) { s = s + c; } else { bitOut.write(table.indexOf(s), bitLength); if (table.size() < 0xfff) { if (table.size() == (1 << bitLength) ) { bitLength += 1; } table.add(s + c); } s = c; } } bitOut.write(table.indexOf(s), bitLength); // end code bitOut.write(endCode, bitLength); bitOut.flush(); return byteOut.toByteArray(); }; var lzwTable = function() { var _map = {}; var _size = 0; var _this = {}; _this.add = function(key) { if (_this.contains(key) ) { throw 'dup key:' + key; } _map[key] = _size; _size += 1; }; _this.size = function() { return _size; }; _this.indexOf = function(key) { return _map[key]; }; _this.contains = function(key) { return typeof _map[key] != 'undefined'; }; return _this; }; return _this; }; var createDataURL = function(width, height, getPixel) { var gif = gifImage(width, height); for (var y = 0; y < height; y += 1) { for (var x = 0; x < width; x += 1) { gif.setPixel(x, y, getPixel(x, y) ); } } var b = byteArrayOutputStream(); gif.write(b); var base64 = base64EncodeOutputStream(); var bytes = b.toByteArray(); for (var i = 0; i < bytes.length; i += 1) { base64.writeByte(bytes[i]); } base64.flush(); return 'data:image/gif;base64,' + base64; }; //--------------------------------------------------------------------- // returns qrcode function. return qrcode; }(); // multibyte support !function() { qrcode.stringToBytesFuncs['UTF-8'] = function(s) { // http://stackoverflow.com/questions/18729405/how-to-convert-utf8-string-to-byte-array function toUTF8Array(str) { var utf8 = []; for (var i=0; i < str.length; i++) { var charcode = str.charCodeAt(i); if (charcode < 0x80) utf8.push(charcode); else if (charcode < 0x800) { utf8.push(0xc0 | (charcode >> 6), 0x80 | (charcode & 0x3f)); } else if (charcode < 0xd800 || charcode >= 0xe000) { utf8.push(0xe0 | (charcode >> 12), 0x80 | ((charcode>>6) & 0x3f), 0x80 | (charcode & 0x3f)); } // surrogate pair else { i++; // UTF-16 encodes 0x10000-0x10FFFF by // subtracting 0x10000 and splitting the // 20 bits of 0x0-0xFFFFF into two halves charcode = 0x10000 + (((charcode & 0x3ff)<<10) | (str.charCodeAt(i) & 0x3ff)); utf8.push(0xf0 | (charcode >>18), 0x80 | ((charcode>>12) & 0x3f), 0x80 | ((charcode>>6) & 0x3f), 0x80 | (charcode & 0x3f)); } } return utf8; } return toUTF8Array(s); }; }(); (function (factory) { if (typeof define === 'function' && define.amd) { define([], factory); } else if (typeof exports === 'object') { module.exports = factory(); } }(function () { return qrcode; }));

怎么生成二维码

  1. 1输入内容粘贴网址链接或任意文字
  2. 2选参数挑输出尺寸与纠错等级
  3. 3即时生成点一下按钮，右侧立刻出码
  4. 4下载保存PNG 适合分享，SVG 无限放大

什么场景会用到

个人名片把手机号/微信/主页链接做成码，扫码即存
菜单/海报印刷 1200px 高清出图，扫码直达点单页
活动签到报名表单链接变成码，现场扫码即填

常见问题

生成的二维码会过期吗？

不会。二维码本身只是内容的图形编码，不经过任何中间服务器，只要被编码的网址/文字还在，码就永远有效。

纠错等级怎么选？

M 是日常推荐；如果二维码要印在可能被磨损、遮挡的地方（包装、户外海报），选 Q 或 H——纠错越高越容易扫出来，但码会更密。

内容太长会失败吗？

二维码有容量上限（约 4000 个数字 / 1800 个拉丁字符 / 900 多个汉字），过长会提示无法生成；网址建议用短链接，码更简洁好扫。

PNG 和 SVG 有什么区别？

PNG 是位图，适合微信/朋友圈分享和网页使用；SVG 是矢量，放多大都不糊，适合印刷和后期编辑。都在浏览器本地生成，内容不上传。

相关工具：图片批量压缩批量改图片尺寸图片格式转换证件照换底色九宫格切图长图切分图片转PDF