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I'm trying to read a binary file from the filesystem and then base64 encode it in JavaScript. I'm using the FileReader API to read the data and the base64 encoder found here . The code I have seems close to working, the problem is that the generated base64 data is wrong. Here's what I've got so far: function saveResource() { var file = $(".resourceFile")[0].files[0]; var reader = new FileReader(); reader.onload = function(evt) { var fileData = evt.target.result; var bytes = new Uint8Array(fileData); var binaryText = ''; for (var index = 0; index < bytes.byteLength; index++) { binaryText += String.fromCharCode( bytes[index] ); } console.log(Base64.encode(binaryText)); }; reader.readAsArrayBuffer(file); }; Here's the file I'm testing with (it's a 100x100 blue square): According to an online base64 decoder/encoder , this file should encode to: 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