Javascript - get extension from base64 image

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I have a base64 encoded image returned from a service and it looks like this:


How can i detect / check the image extension?

For a String (which you can parse out of an image) you can do this:

// Create Base64 Object
var Base64={_keyStr:"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",encode:function(e){var t="";var n,r,i,s,o,u,a;var f=0;e=Base64._utf8_encode(e);while(f<e.length){n=e.charCodeAt(f++);r=e.charCodeAt(f++);i=e.charCodeAt(f++);s=n>>2;o=(n&3)<<4|r>>4;u=(r&15)<<2|i>>6;a=i&63;if(isNaN(r)){u=a=64}else if(isNaN(i)){a=64}t=t+this._keyStr.charAt(s)+this._keyStr.charAt(o)+this._keyStr.charAt(u)+this._keyStr.charAt(a)}return t},decode:function(e){var t="";var n,r,i;var s,o,u,a;var f=0;e=e.replace(/[^A-Za-z0-9\+\/\=]/g,"");while(f<e.length){s=this._keyStr.indexOf(e.charAt(f++));o=this._keyStr.indexOf(e.charAt(f++));u=this._keyStr.indexOf(e.charAt(f++));a=this._keyStr.indexOf(e.charAt(f++));n=s<<2|o>>4;r=(o&15)<<4|u>>2;i=(u&3)<<6|a;t=t+String.fromCharCode(n);if(u!=64){t=t+String.fromCharCode(r)}if(a!=64){t=t+String.fromCharCode(i)}}t=Base64._utf8_decode(t);return t},_utf8_encode:function(e){e=e.replace(/\r\n/g,"\n");var t="";for(var n=0;n<e.length;n++){var r=e.charCodeAt(n);if(r<128){t+=String.fromCharCode(r)}else if(r>127&&r<2048){t+=String.fromCharCode(r>>6|192);t+=String.fromCharCode(r&63|128)}else{t+=String.fromCharCode(r>>12|224);t+=String.fromCharCode(r>>6&63|128);t+=String.fromCharCode(r&63|128)}}return t},_utf8_decode:function(e){var t="";var n=0;var r=c1=c2=0;while(n<e.length){r=e.charCodeAt(n);if(r<128){t+=String.fromCharCode(r);n++}else if(r>191&&r<224){c2=e.charCodeAt(n+1);t+=String.fromCharCode((r&31)<<6|c2&63);n+=2}else{c2=e.charCodeAt(n+1);c3=e.charCodeAt(n+2);t+=String.fromCharCode((r&15)<<12|(c2&63)<<6|c3&63);n+=3}}return t}}

// Define the string, also meaning that you need to know the file extension
var encoded = "Base64 encoded image returned from your service";

// Decode the string
var decoded = Base64.decode(encoded);

// if the file extension is unknown
var extension = undefined;
// do something like this
var lowerCase = decoded.toLowerCase();
if (lowerCase.indexOf("png") !== -1) extension = "png"
else if (lowerCase.indexOf("jpg") !== -1 || lowerCase.indexOf("jpeg") !== -1)
    extension = "jpg"
else extension = "tiff";

// and then to display the image
var img = document.createElement("img");
img.src = decoded;

// alternatively, you can do this
img.src = "data:image/" + extension + ";base64," + encoded;

For completion's sake here's the source and I hope this helps!

How to identify file type by Base64 encoded string of a image, //Decode the Base64 encoded string into byte array // tokenize the data since the 64 encoded if you want to get Mime type use this one Though it's written in JavaScript, you can try to implement the same thing in Java. To convert image to Base64 and get the original Base64 string, I highly recommend using one of the following methods: Encode remote file to Base64 in JavaScript; Encode form file to Base64 in JavaScript; Of course, we can use new Image() to draw a canvas and using the toDataURL() method to get the Base64 string. But this can only be useful if

A bit late but it seem the question was misunderstood. He just only had the base64 content of the image, not the full data URI.

I wrote here for anyone who encounters with this quest, you can read the first character of content content.charAt(0). By base64 image content if the first char is:

'/' : jpg

'i' : png

'R' : gif

'U' : webp

So for your case, it is 'jpg'.

How to extract the MIME type from a base64 string. » Miguel Mota , Extract the MIME type from a base64 string using a regular expression. function base64MimeType(encoded) { var result = null; if (typeof encoded  but in ie 11 clipBoard variable has no "items" or "types". i will upload that image server but i didnt get base64 encoded data. Best How To : In Chrome and Opera (and most probably Safari , but I cannot test it now) you can access the clipboard as you wrote in your question.

Was just tweaking with the string. May be this could help.

base64Data.substring("data:image/".length, base64Data.indexOf(";base64"))

How to convert a base64 image into a image file and upload it with , To get started, we need to convert a base64 string into a "file" using Javascript, to do that, we are going to convert a Base64 string to a Blob and the content type of the file i.e (image/jpeg - image/png - text/plain) * @param  @Graeme That is a good thought. To get more data, I just did grep '+' /etc/mime.types and found two extensions with plus signs, both related to c++ source code. The more extensive search [ ext for ext in mimetypes.types_map if '+' in ext ] yielded the same result.

Just a little error on the second split. But this is what i expected. Thanks you !

const type = base64Data.split(';')[0].split('/')[1];

get image mime type from base64 · GitHub, get image mime type from base64. GitHub Gist: instantly share code, notes, and snippets. I get a file which is Base64 encoded string as the image. But I think the content of this contains information about file type like png, jpeg, etc. But I think the content of this contains information about file type like png, jpeg, etc.

This one will work for any extension type: pdf, mp3, png, ....

base64.substring(base64.indexOf('/') + 1, base64.indexOf(';base64'));

Check mime type from base64 string in Node.js · GitHub, Check mime type from base64 string in Node.js. check-mime-type-from-base64-​string-node.js. const fileType = require('file-type'). const base64String  @William I'm not trying to secure the data, just get it to the correct format. (Apex platform) requires that database base64-encoded before the record is created in the database, their functionality to base64 encode file data via a form is very poorly documented (I figured out how to do this after asking this question).

Get File Extention from Base64 String, For a String (which you can parse out of an image) you can do this: // Create Base64 Object var Base64={_keyStr:"  Using an Image File, I am getting the url of an image, that needs be to send to a webservice. From there the image has to be saved locally on my system. How to convert the image url to BASE64? possible duplicate of How can you encode a string to Base64 in JavaScript? – S.C. Mar 4 '14 at 13:10. If you're just trying to encode the url and not

Data URLs, Unless the extension is contained within the data converted to base64, then no, you probably can't. It may be possible to look at the data and  I have web method in which I have passed 1) Base64 string and 2) File Name with File Extension but now I wanted to Pass 1) Base64 String and 2) Only File Name (Without Extension) So Can I get that Extension from that Base64 String / how can i get that base64 Encoded File's Extension. Thanks.

Base64, The mediatype is a MIME type string, such as 'image/jpeg' for a JPEG image file. An HTML document that executes a JavaScript alert. The Web APIs have native methods to encode or decode to base64: Base64 encoding and Get the latest and greatest from MDN delivered straight to your inbox. Javascript Convert Base64 To File - Online base64, base64 decode, base64 encode, base64 converter, python, to text _decode decode image, javascript, convert to image, to string java b64 decode, decode64 , file to, java encode, to ascii php, decode php , encode to file, js, _encode, string to text to decoder, url characters, atob javascript, html img, c# encode, 64 bit decoder, decode linuxbase

  • this is the image code or image picName/url+picName in base64?
  • ok, is the image code, I can obly get this: ÿØÿà JFIF H H ÿáŠv <?xpacket begin="" id="W5M0MpCehiHzreSzNTczkc9d"?> <x:xmpmeta xmlns:x="adobe:ns:meta/" x:xmptk="Adobe XMP Core 4.1-c036 46.277092, Fri Feb 23 2007 14:16:18 "> <rdf:RDF áµ
  • this is the base64 of the image content, you can get the same encoding an image on this site for example
  • hi, thank you but i can't understand how to return the original image extension
  • @sbaaaang If you have decoded your payload, i.e. have decoded the Base64 String that the server returned, you have an image like any other. The only difference is, is that you only have the data in your image. In other words the image isn't stored locally, only programmatically.
  • yes but how do i get then the decoded file extension? :D
  • @sbaaaang I have updated my answer. I admit it is a little hacky, but it's the only way to get the file extension with the information the client has.
  • Why do you define Base64 object, when there are atob and btoa functions?…
  • I came here looking for this answer. For completeness, U is for webp
  • While this should be also true for .pdf that has the base64 starting with J, this is not always true on other image types, as I tested this on TIF files and they have base64 starting with i and T.
  • this is useful in backend operations where image come in request body