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    <p><strong>Note:</strong> Get an ready-made palette with this functionality <a href="http://ge.tt/9Ymx9qB?c" rel="nofollow noreferrer">here</a>.</p> <hr> <p>Arnoud's solution got me excited and impatient, so here's an improvement to it. I couldn't have done this without studying his code. This version seems to be somewhat more reliable and less prone to timeout errors, but to be honest, I know no Java at all, so any improvements are welcome.</p> <p>Most importantly: this version uploads to <code>stack.imgur.com</code> directly, so it's safe to use here on StackOverflow, without having to worry that uploaded images will disappear after a while.</p> <p>I provide three functions: </p> <ul> <li><code>stackImage</code> uploads the expression, exported as PNG, and returns the URL</li> <li><code>stackMarkdown</code> returns the markdown, ready to be copied</li> <li><code>stackCopyMarkdown</code> copies the markdown to the clipboard</li> </ul> <p>Next step: create a palette button that does this automatically for the selected graphic in the notebook. Improvements to the code are very welcome.</p> <hr> <pre><code>Needs["JLink`"] stackImage::httperr = "Server returned respose code: `1`"; stackImage::err = "Server returner error: `1`"; stackImage[g_] := Module[ {getVal, url, client, method, data, partSource, part, entity, code, response, error, result}, (* this function attempts to parse the response fro the SO server *) getVal[res_, key_String] := With[{k = "var " &lt;&gt; key &lt;&gt; " = "}, StringTrim[ First@StringCases[First@Select[res, StringMatchQ[#, k ~~ ___] &amp;], k ~~ v___ ~~ ";" :&gt; v], "'"] ]; data = ExportString[g, "PNG"]; JavaBlock[ url = "https://stackoverflow.com/upload/image"; client = JavaNew["org.apache.commons.httpclient.HttpClient"]; method = JavaNew["org.apache.commons.httpclient.methods.PostMethod", url]; partSource = JavaNew["org.apache.commons.httpclient.methods.multipart.ByteArrayPartSource", "mmagraphics.png", MakeJavaObject[data]@toCharArray[]]; part = JavaNew["org.apache.commons.httpclient.methods.multipart.FilePart", "name", partSource]; part@setContentType["image/png"]; entity = JavaNew["org.apache.commons.httpclient.methods.multipart.MultipartRequestEntity", {part}, method@getParams[]]; method@setRequestEntity[entity]; code = client@executeMethod[method]; response = method@getResponseBodyAsString[]; ] If[code =!= 200, Message[stackImage::httperr, code]; Return[$Failed]]; response = StringTrim /@ StringSplit[response, "\n"]; error = getVal[response, "error"]; result = getVal[response, "result"]; If[StringMatchQ[result, "http*"], result, Message[stackImage::err, error]; $Failed] ] stackMarkdown[g_] := "![Mathematica graphics](" &lt;&gt; stackImage[g] &lt;&gt; ")" stackCopyMarkdown[g_] := Module[{nb, markdown}, markdown = Check[stackMarkdown[g], $Failed]; If[markdown =!= $Failed, nb = NotebookCreate[Visible -&gt; False]; NotebookWrite[nb, Cell[markdown, "Text"]]; SelectionMove[nb, All, Notebook]; FrontEndTokenExecute[nb, "Copy"]; NotebookClose[nb]; ] ] </code></pre> <p><strong>Update:</strong></p> <p>Here's a button that will show a preview of the selection and will offer uploading (or cancelling). It requires the previous functions to be defined.</p> <pre><code>Button["Upload to SO", Module[{cell = NotebookRead@InputNotebook[], img}, If[cell =!= {}, img = Rasterize[cell]; MessageDialog[ Column[{"Upload image to StackExchange sites?", img}], {"Upload and copy MarkDown" :&gt; stackCopyMarkdown[img], "Cancel" :&gt; Null}, WindowTitle -&gt; "Upload to StackExchange"]]]] </code></pre> <p>Unfortunately I can't put the button in a palette (<code>CreatePalette</code>) because the palette dimensions will influence the rasterization. Solutions to this problem are welcome.</p> <p><strong>Update 2:</strong> </p> <p>Based on the answer to <a href="https://stackoverflow.com/questions/8353838/controlling-the-rasterize-width-for-notebook-related-expressions">this question</a>, here's a working Windows-only palette button:</p> <pre><code>button = Button["Upload to SO", Module[{sel}, FrontEndExecute[ FrontEndToken[FrontEnd`SelectedNotebook[], "CopySpecial", "MGF"]]; sel = Cases[NotebookGet@ClipboardNotebook[], RasterBox[data_, ___] :&gt; Image[data, "Byte", ColorSpace -&gt; "RGB", Magnification -&gt; 1], Infinity]; If[sel =!= {}, With[{img = First[sel]}, MessageDialog[ Column[{"Upload image to StackExchange sites?", img}], {"Upload and copy MarkDown" :&gt; stackCopyMarkdown[img], "Cancel" :&gt; Null}, WindowTitle -&gt; "Upload to StackExchange"] ] ] ] ] CreatePalette[button] </code></pre> <p>Warning: it destroys the clipboard contents even if you click cancel in the preview box.</p>
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    1. COI think the Rasterize palette issue is worth its own question.
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    2. COThat's fantastic! I was reserving my vote in hope of this. ***+1***
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    3. CO@Mr.Wizard check the chatroom for a packaged up solution
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