Enhance the contrast and brightness of scanned PDF documents for better display and readability
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What is Contrast PDF ?
Contrast PDF is a free online tool that adjusts the contrast and brightness of scanned PDF documents. If you want to increase the contrast or brightness of a PDF to darken text relative to background color, then this is your tool. With this free service, you can quickly and easily darken page text with respect to background for better viewing. Notice that the service converts PDF pages into images, contrast them, then convert images back to non-editable PDF.