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    <p><em>Note</em>: This is using the anonymous imgur uploader with my anonymous key. The imgur site restricts uploads to 50 uploads/hour which should be fine normally, but this may cause a problem if a lot of people try this simultaneously. So please get your own anonymous key here: </p> <p><a href="http://imgur.com/register/api_anon" rel="nofollow noreferrer">http://imgur.com/register/api_anon</a></p> <p>And then replace the key in the code below with your own key (<em>thanks!</em>).</p> <p>The trickiest part to code was the conversion from a Mathematica expression to PNG image to Base64 encoding to URL encoding. There are about a 1,000 ways to do it wrong and I think I managed to try them all.</p> <p>The code breaks down into a few pieces: </p> <ul> <li>Construct the POST url</li> <li>Make the HTTP connection</li> <li>Send the POST url</li> <li>Read back the result, which is XML</li> <li>Extract the imgur url from the XML</li> <li>Format the imgur url as markdown (or as a <em>Mathematica</em> <code>Hyperlink</code> function).</li> </ul> <p>Here is the code:</p> <pre><code>imgur[expr_] := Module[{url, key, image, data, jUrl, jConn, jWriter, jInput, buffer, byte, xml, imgurUrl}, Needs["JLink`"]; JLink`JavaBlock[ JLink`LoadJavaClass["java.net.URLEncoder"]; url = "http://api.imgur.com/2/upload"; key = "c07bc3fb59ef878d5e23a0c4972fbb29"; image = ExportString[ExportString[expr, "PNG"], "Base64"]; data = URLEncoder`encode["key" , "UTF-8"] &lt;&gt; "=" &lt;&gt; URLEncoder`encode[ key , "UTF-8"] &lt;&gt; "&amp;" &lt;&gt; URLEncoder`encode["image" , "UTF-8"] &lt;&gt; "=" &lt;&gt; URLEncoder`encode[ image , "UTF-8"] ; jUrl = JLink`JavaNew["java.net.URL", url]; jConn = jUrl@openConnection[]; jConn@setDoOutput[True]; jWriter = JLink`JavaNew["java.io.OutputStreamWriter", jConn@getOutputStream[]]; jWriter@write[data]; jWriter@flush[]; jInput = jConn@getInputStream[]; buffer = {}; While[(byte = jInput@read[]; byte &gt;= 0), AppendTo[buffer, byte]]; ]; xml = ImportString[FromCharacterCode[buffer], "XML"]; imgurUrl = Cases[xml, XMLElement["original", {}, {string_}] :&gt; string, \[Infinity]][[1]]; "![Mathematica graphic](" &lt;&gt; imgurUrl &lt;&gt; ")" ] </code></pre> <p>Testing:</p> <pre><code>In[]:= g = Graphics[{Blue, Disk[]}, PlotRange -&gt; 1.2, ImageSize -&gt; Small]; pic = Overlay[{Blur[Binarize@g, 10], g}]; imgur[pic] Out[]= ![Mathematica graphic](http://i.imgur.com/eGOlL.png) </code></pre> <p>And the actual image:</p> <p><img src="https://i.imgur.com/eGOlL.png" alt="Mathematica graphic"></p>
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    1. POUpload images to Imgur from Mathematica
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    1. COIs there a way to do the encoding and the uploading within Mathematica itself, without resorting to `JLink`? +1, btw.
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    2. CO@rcollyer -- Not in V8, to the best of my knowledge. Is encoding and uploading something you would like to see as a built-in feature of Mathematica?
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    3. COI got errors: ``Java::excptn: A Java exception occurred: java.io.IOException: Server returned HTTP response code: 400 for URL: http://api.imgur.com/2/upload at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1290). XML`Parser`XMLGetString::string: String expected at position 1 in XML`Parser`XMLGetString[EndOfFile].``
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