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I have a canvas that you can paint on. I need to save it's contents to the server so it can be resumed later. To do this, I xMLHttpReq.send(*) the encodeURIComponent(canvasP.toDataURL())* via a xMLHttpReq.open("POST", url, false); In my php script, I take the $_POST and base64_decode(json_decode($_POST[data])) and I save it to a .png file on the server. NOW, this works fine and dandy if the canvas has a small doodle on it. BUT if the 1600x1200px canvas has a lot of stuff drawn on it, and it's like 600kB in size, my script fails, and I get a 0kB png on my server. How do I fix this? How can I send a large canvas to the server? Is the problem a limitation to _POST size? Because, no matter how large the canvas is, I can always download it via a window.open(canvasP.toDataURL(), "blabla"); . This is quite the dilemma for me. Any help will be much appreciated! [EDIT] The PHP simply receives empty $_POST[data] for anything over ~50-something kB... So the problem has to occur between canvasP.toDataURL() and the POST-ing... [EDIT2] Browser says "Uploading...(xx%)" until it's "done". SO WHERE DOES THE DATA GO? :C [EDIT3] Here's the app, try it for yourself (use google chrome): http://students.info.uaic.ro/~tudor.berechet/ [EDIT4] Mike's answer seems to be right about suhosin

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