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jQuery.base64.js (feel free to write a bit about it) You can check for btoa and atob support and refer to jQuery.base64 if (!window.btoa) window.btoa = $.base64.btoa if (!window.atob) window.atob = $.base64.atob Options You can define some options per default, set them globally use the following syntax: $.base64.utf8encode = true; Utf8 encoding and decoding as global option, possibilities: option description default raw If false it encodes/decodes both, the input and output. true utf8encode To encode only the input you can set encodung to true. false utf8decode Same as above but for the output and decoding. false You can override the global options by passing an extra parameter: $.base64[property](<value>, options); / $.base64(<property>, <value>, options); To enable UTF8-encoding pass true as the last paramter: $.base64.atob(<value>, true); $.base64('atob', <value>, true);