Your print provider does not accept RGB images? You have to deliver images in the CMYK color space but you don't have access to a professional tool to convert an image from RGB to CMYK? With this free online tool you can convert your images (JPG, PNG, TIFF, GIF) from RGB to the CMYK color space using a professional ICC profile.
Images in TIFF format give the best results for printing. Choose PDF if your print shop asks for PDF files. Best: ask your print shop which profile to use. If you can't: in Europe, PSO Coated v3 for coated (glossy or matte) paper, PSO Uncoated v3 for uncoated paper, Standard newsprint for newspapers; in the USA, GRACoL 2013.
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