Convert image byte to base64 javascript

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Convert image byte to base64 javascript

Comments: 21 | Rating: 4.1/5 Convert image to Base64 online and use the result string as data URI, img src, CSS background-url, and others. Sometimes you have to send or output an image within a text document (for example, HTML, CSS, JSON, XML), but you cannot do this because binary characters will damage the syntax of the text document. To prevent this, for example, you can encode image to Base64 and embed it using the data URI. Please note that the image to Base64 encoder accepts any images types with a size of up to 50 MB. If you are looking for the reverse process, check Base64 to Image. Additional image encoders The Image to Base64 converter generates ready-made examples, depending on the selected output format. It automatically detects the content type of the uploaded image, so that you simply copy the complete result. If you need to encode specific image formats, please follow the links below. Output formats If you do not know what output format you need, check the following examples to see how will look the result of the same Base64-encoded image formatted in each of the available formats (as an example image I use a one-pixel red dot GIF file):? Plain text:R0lGODdhAQABAPAAAP8AAAAAACwAAAAAAQABAAACAkQBADs=? Data URI:data:image/gif;base64,R0lGODdhAQABAPAAAP8AAAAAACwAAAAAAQABAAACAkQBADs=? CSS Background Image:.base64 { background-image: url("data:image/gif;base64,R0lGODdhAQABAPAAAP8AAAAAACwAAAAAAQABAAACAkQBADs=") }? HTML Favicon:? HTML Hyperlink:? HTML Image:? HTML Iframe: The "iframe" tag is not supported by your browser. ? JavaScript Image:var img = new Image(); img.src = "data:image/gif;base64,R0lGODdhAQABAPAAAP8AAAAAACwAAAAAAQABAAACAkQBADs="; document.body.appendChild(img);? JavaScript Popup:window.onclick = function () { this.open("data:image/gif;base64,R0lGODdhAQABAPAAAP8AAAAAACwAAAAAAQABAAACAkQBADs="); };? JSON:{ "image": { "mime": "image/gif", "data": "R0lGODdhAQABAPAAAP8AAAAAACwAAAAAAQABAAACAkQBADs=" } }? XML: R0lGODdhAQABAPAAAP8AAAAAACwAAAAAAQABAAACAkQBADs= If I missed an important output format for Base64-encoded images, please let me know -- I would love to implement it. A few days ago I was looking for a way to quickly put an image as a string to send it in a message. I remembered that it was possible to use base64 for that but I did not remember the exact procedure. I had to get bits from different stackoverflow answers to get it working. I decided to write this article to save you a few minutes. function imgToBase64(img) { const canvas = document.createElement('canvas'); const ctx = canvas.getContext('2d'); canvas.width = img.width; canvas.height = img.height; // I think this won't work inside the function from the console img.crossOrigin = 'anonymous'; ctx.drawImage(img, 0, 0); return canvas.toDataURL(); } Let's try it: Here is a beautiful photo of Xochimilco, in Mexico City, Mexico taken by Jeremy Lishner on Unsplash. You can follow the link, if you want, but I included the image so you don't have to leave this page. Open the console (Ctrl + Shift + I). Paste the code. We will have imgToBase64 available as a function. Click the pick icon on the top left (Ctrl + Shift + C) and select the image. Now you will have a reference to the DOMElement with $0. Type copy(imgToBase64($0)). Now you have the image string in the clipboard, ready to paste somewhere else. Sometimes you get an error SecurityError: The operation is insecure., this is related to the crossOrigin attribute, you can manually change the value to anonymous $0.crossOrigin = 'anonymous' and repeat step 4. Tip: You can test the base64 image string you just created by pasting it in the url of a browser tab. Like this: That's it... I hope you find it useful. Mwenda Harun Mbaabu - Aug 16 Base64 is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation. The term Base64 originates from a specific MIME content transfer encoding. Base64 encoding schemes are commonly used when there is a need to encode binary data that needs to be stored and transferred over media that are designed to deal with ASCII. This is to ensure that the data remain intact without modification during transport. Base64 is commonly used in a number of applications including email via MIME, and storing complex data in XML. One common application of Base64 encoding on the web is to encode binary data so it can be included in a data: URL. In JavaScript there are two functions respectively for decoding and encoding Base64 strings: btoa(): creates a Base64-encoded ASCII string from a "string" of binary data ("btoa" should be read as "binary to ASCII"). atob(): decodes a Base64-encoded string("atob" should be read as "ASCII to binary"). The algorithm used by atob() and btoa() is specified in RFC 4648, section 4. Note that btoa() expects to be passed binary data, and will throw an exception if the given string contains any characters whose UTF16 representation occupies more than one byte. For more details, see the documentation for btoa().Each Base64 digit represents exactly 6 bits of data. So, three 8-bits bytes of the input string/binary file (3?8 bits = 24 bits) can be represented by four 6-bit Base64 digits (4?6 = 24 bits). This means that the Base64 version of a string or file will be at least 133% the size of its source (a ~33% increase). The increase may be larger if the encoded data is small. For example, the string "a" with length === 1 gets encoded to "YQ==" with length === 4 -- a 300% increase.Since DOMStrings are 16-bit-encoded strings, in most browsers calling window.btoa on a Unicode string will cause a Character Out Of Range exception if a character exceeds the range of a 8-bit ASCII-encoded character. There are two possible methods to solve this problem: the first one is to escape the whole string and then encode it; the second one is to convert the UTF-16 DOMString to an UTF-8 array of characters and then encode it. Here are the two possible methods.function utf8_to_b64( str ) { return window.btoa(unescape(encodeURIComponent( str ))); } function b64_to_utf8( str ) { return decodeURIComponent(escape(window.atob( str ))); } utf8_to_b64(' ? la mode'); b64_to_utf8('4pyTIMOgIGxhIG1vZGU='); This solution has been proposed by Johan Sundstr?m. Another possible solution without utilizing the now deprecated 'unescape' and 'escape' functions. function b64EncodeUnicode(str) { return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g, function(match, p1) { return String.fromCharCode('0x' + p1); })); } b64EncodeUnicode(' ? la mode'); Note: The following code is also useful to get an ArrayBuffer from a Base64 string and/or viceversa (see below). "use strict"; function b64ToUint6 (nChr) { return nChr > 64 && nChr < 91 ? nChr - 65 : nChr > 96 && nChr < 123 ? nChr - 71 : nChr > 47 && nChr < 58 ? nChr + 4 : nChr === 43 ? 62 : nChr === 47 ? 63 : 0; } function base64DecToArr (sBase64, nBlocksSize) { var sB64Enc = sBase64.replace(/[^A-Za-z0-9\+\/]/g, ""), nInLen = sB64Enc.length, nOutLen = nBlocksSize ? Math.ceil((nInLen * 3 + 1 >> 2) / nBlocksSize) * nBlocksSize : nInLen * 3 + 1 >> 2, taBytes = new Uint8Array(nOutLen); for (var nMod3, nMod4, nUint24 = 0, nOutIdx = 0, nInIdx = 0; nInIdx < nInLen; nInIdx++) { nMod4 = nInIdx & 3; nUint24 |= b64ToUint6(sB64Enc.charCodeAt(nInIdx)) >> (16 >>> nMod3 & 24) & 255; } nUint24 = 0; } } return taBytes; } function uint6ToB64 (nUint6) { return nUint6 < 26 ? nUint6 + 65 : nUint6 < 52 ? nUint6 + 71 : nUint6 < 62 ? nUint6 - 4 : nUint6 === 62 ? 43 : nUint6 === 63 ? 47 : 65; } function base64EncArr (aBytes) { var nMod3 = 2, sB64Enc = ""; for (var nLen = aBytes.length, nUint24 = 0, nIdx = 0; nIdx < nLen; nIdx++) { nMod3 = nIdx % 3; if (nIdx > 0 && (nIdx * 4 / 3) % 76 === 0) { sB64Enc += "\r"; } nUint24 |= aBytes[nIdx] >> nMod3 & 24); if (nMod3 === 2 || aBytes.length - nIdx === 1) { sB64Enc += String.fromCharCode(uint6ToB64(nUint24 >>> 18 & 63), uint6ToB64(nUint24 >>> 12 & 63), uint6ToB64(nUint24 >>> 6 & 63), uint6ToB64(nUint24 & 63)); nUint24 = 0; } } return sB64Enc.substr(0, sB64Enc.length - 2 + nMod3) + (nMod3 === 2 ? '' : nMod3 === 1 ? '=' : '=='); } function UTF8ArrToStr (aBytes) { var sView = ""; for (var nPart, nLen = aBytes.length, nIdx = 0; nIdx < nLen; nIdx++) { nPart = aBytes[nIdx]; sView += String.fromCharCode( nPart > 251 && nPart < 254 && nIdx + 5 < nLen ? (nPart - 252) * 1073741824 + (aBytes[++nIdx] - 128 >> 18); aBytes[nIdx++] = 128 + (nChr >>> 12 & 63); aBytes[nIdx++] = 128 + (nChr >>> 6 & 63); aBytes[nIdx++] = 128 + (nChr & 63); } else if (nChr < 0x4000000) { aBytes[nIdx++] = 248 + (nChr >>> 24); aBytes[nIdx++] = 128 + (nChr >>> 18 & 63); aBytes[nIdx++] = 128 + (nChr >>> 12 & 63); aBytes[nIdx++] = 128 + (nChr >>> 6 & 63); aBytes[nIdx++] = 128 + (nChr & 63); } else { aBytes[nIdx++] = 252 + (nChr >>> 30); aBytes[nIdx++] = 128 + (nChr >>> 24 & 63); aBytes[nIdx++] = 128 + (nChr >>> 18 & 63); aBytes[nIdx++] = 128 + (nChr >>> 12 & 63); aBytes[nIdx++] = 128 + (nChr >>> 6 & 63); aBytes[nIdx++] = 128 + (nChr & 63); } } return aBytes; } var sMyInput = "Base 64 \u2014 Mozilla Developer Network"; var aMyUTF8Input = strToUTF8Arr(sMyInput); var sMyBase64 = base64EncArr(aMyUTF8Input); alert(sMyBase64); var aMyUTF8Output = base64DecToArr(sMyBase64); var sMyOutput = UTF8ArrToStr(aMyUTF8Output); alert(sMyOutput);These function let us to create also uint8Arrays or arrayBuffers from Base64-encoded strings: var myArray = base64DecToArr("QmFzZSA2NCDigJQgTW96aWxsYSBEZXZlbG9wZXIgTmV0d29yaw=="); var myBuffer = base64DecToArr("QmFzZSA2NCDigJQgTW96aWxsYSBEZXZlbG9wZXIgTmV0d29yaw==").buffer; alert(myBuffer.byteLength); Note: The function base64DecToArr(sBase64[, nBlocksSize]) returns an uint8Array of bytes. If your aim is to build a buffer of 16-bit / 32-bit / 64-bit raw data, use the nBlocksSize argument, which is the number of bytes of which the uint8Array.buffer.bytesLength property must result a multiple (1 or omitted for ASCII, binary strings or UTF-8-encoded strings, 2 for UTF-16 strings, 4 for UTF-32 strings). convert image byte array to base64 string javascript. convert base64 image to byte array javascript

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