I don't see anything in the docs about limiting the size of blobs that can be uploaded. My guess (if it's helpful) is you have to check the size after it's uploaded (via BlobInfo) and delete a blob that's too large and return an error to the user. I don't think there's any reliable http/html/browser standard that would limit the size of a file upload and handle the UI to alert the user, so it's seems fair that the blobstore gives the basic building blocks up a file upload and you have to add your limit and code/UI to handle files over the limit. If you're interested, I did find the following discussion about a JavaScript approach to check and limit file sizes for uploads, but apparently it doesn't work in all browsers http://forums.digitalpoint.com/showthread.php?t=1461121
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