Photo CMYK to RGB

It converts images saved in CMYK, the color model used for commercial printing, into RGB, the standard for screens. Photographers and designers often receive CMYK files from a print project or export one by accident, and those files can display with wrong or dull colors online, or fail to open at all in some apps and platforms. The tool decodes each file, converts its colors to sRGB, and saves a new RGB copy as a JPEG or PNG.

Screens make color by mixing red, green, and blue light, while CMYK describes amounts of cyan, magenta, yellow, and black ink on paper. A CMYK file has to be converted every time it is displayed, and browsers and apps do that inconsistently: some use the embedded profile, some ignore it, and some cannot show the file at all, which leads to muted, shifted, or even inverted colors. Converting to RGB once removes the guesswork, so every viewer shows the same colors.

Drag your CMYK files onto the drop area or click it to browse; you can add several at once and more later. Choose JPEG (RGB) or PNG (RGB) as the output, and for JPEG set the quality slider, which starts at 90. Click Convert to RGB and each file is processed in turn, its status moving to Done, and each converted copy downloads automatically with RGB_ added to the start of its name. Clear All empties the list.

Whenever the image is headed for a screen rather than a printing press: your portfolio website, social media, an emailed proof, a client gallery, or online publication. Files prepared in CMYK for a magazine, brochure, or catalog should be converted back to RGB before being reused for digital marketing. If you still have the original RGB edit, exporting from that is even better, since every conversion between color spaces costs a little color.

Some shift is normal, because CMYK and RGB cover different ranges of color. CMYK JPEGs are converted by your browser's own color management, which uses the embedded color profile when the file has one. CMYK TIFFs are converted with a standard formula that does not read a profile, so colors can differ from a profile-based conversion in an editor. If accuracy matters, compare the result with the original and make small saturation or color balance corrections in your editor.

RGB is additive: screens combine red, green, and blue light, and adding all three at full strength gives white. CMYK is subtractive: printers lay down cyan, magenta, yellow, and black inks, which absorb light reflected from the paper, and adding ink makes things darker. Each model suits its medium, so files should be in the color space of their final destination for the colors to appear as you intended.

That depends on the output you choose. PNG is lossless, so the converted pixels are stored without any compression loss, at the cost of larger files. JPEG applies compression set by the quality slider, from 10 to 100; at the default of 90 the difference is hard to see, and 100 gives the highest quality. Either way the image keeps its original pixel dimensions. Any transparent areas are filled with white.

CMYK JPEG and TIFF files are the main inputs, and RGB JPEG, PNG, and WebP files are accepted too. TIFFs, including multi-page files, where the first image is used, are decoded by a TIFF library built into the tool, because most browsers cannot read TIFF on their own. PSD and raw files are not supported; export them from your editor as a CMYK TIFF or JPEG first. Output is always an sRGB JPEG or PNG.

Commercial presses print with four inks, cyan, magenta, yellow, and black, so a CMYK file tells the printer exactly how much of each ink to lay down. Monitors, phones, and televisions instead build every pixel from red, green, and blue light, and web browsers are designed around RGB data. Supplying each medium with the color model it uses prevents devices from guessing at conversions, which keeps your photography looking consistent wherever it appears.

If a file's status shows Can't read this file, its contents could not be decoded. Common causes are an unusual TIFF variant, such as one with layers, unusual compression, or a bit depth the decoder does not handle, or a format that is not supported at all, such as PSD. Re-save the image from your editor as a flattened 8-bit CMYK TIFF or a CMYK JPEG and try again. Very large TIFFs are decoded in your browser's memory, so a modest computer may need more time.