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Message: [QUOTE="Sean Berry, post: 4910426"] JMB, The posts above are quite right about Base64 encoding and size fluctuations. However, in my case I had clients who wanted to have some sort of progress indicator. When someone has to upload a 50 magabyte file for instance they want to know that the upload is still in progress after 1 minute. My program works by using the CONTENT_LENGTH of the request as the total size. Then, using AJAX, it retrieves the current size of the file on the server and creates a progress bar based on the that. Is it 100% accurate? NO! Does it satisfy the customer by providing them with exactly what they wanted? YES! And does it actually work with a fair amount of accuracy? YES! [/QUOTE]