Decode base64 javascript online11/29/2023 We converted a File, Blob,, and to DataURLs and we looked at how to convert a DataURL to a Base64 string. complete ) toDataURL (image ) // Wait for the image to load before converting else image. then ( ( blob ) => // If the image has already loaded, let's go! if (image. getElementById ( 'my-image' ) // Get the remote image as a Blob with the fetch API fetch (image. If the MIME type is incorrect the DataURL will be incorrect as well. Note that the MIME type returned by remote server in the Content-Type response header is reflected in the DataURL. If the image is located on a remote server the CORS configuration of the remote server must allow our local script to access the image. If our image is an element we can fetch the image src and convert that to a Base64 string.Īlternatively we can draw the image to a canvas and then convert the canvas to an image element, this would be useful if we’re looking for a specific image format. Convert to Base64 string const base64 = getBase64StringFromDataURL (dataURL ) Ĭonsole. log (dataURL ) // Logs data:image/jpeg base64,wL2dvYWwgbW9yZ. toDataURL ( 'image/jpeg', 0.5 ) Ĭonsole. getElementById ( 'my-canvas' ) // Convert canvas to dataURL and log to console const dataURL = canvas. When using 'image/jpeg' or 'image/webp' we can pass the image compression as the last argument, 0 means a lot of compression, 1 means no compression. īy default the canvas outputs to a lossless PNG, we can pass 'image/png', 'image/jpeg' or 'image/webp' to the toDataURL method to get a different format. log (dataURL ) // Logs data:image/png base64,wL2dvYWwgbW9yZ. If we have a that we want to turn into a Base64 string we can use toDataURL on the Canvas element. We’ll also use the FileReader API when converting an image tag to a Base64 string. When the image is a File object or Blob we can use the FileReader API please see this article on converting a file to base64 string or dataURL. const getBase64StringFromDataURL = ( dataURL ) =>ĭataURL. We’ll be converting images to DataURLs, we can use the function below to convert a DataURL to a Base64 string. In all examples below we assume we already have a, , File, or Blob object available. We look at converting a File object or Blob, a canvas element, and an image tag. In this short tutorial we explore 3 different JavaScript methods to convert an image into a Base64 string.
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