Check whether a PDF contains RGB, CMYK, grayscale, ICC-based, or spot-color signals. Quicklio analyzes page drawing operations and readable PDF color-space declarations locally in your browser—your file is not uploaded.
| Page | Direct paint signals | RGB ops | CMYK ops | Gray ops |
|---|
This is a diagnostic checker, not a color conversion or press-ready certification. PDFs can mix color spaces object by object, and some profiles or image color information may be encoded in ways a lightweight browser scan cannot identify exhaustively. Follow the requirements of the printer or publishing service that will actually output the file.
A PDF does not have to use one global color mode. Text, vector artwork, images, gradients, and spot inks can use different color spaces in the same file. That is why this checker reports the signals it finds instead of forcing the entire PDF into a single label.
If both RGB and CMYK are detected, the result says Mixed RGB + CMYK signals. That is useful evidence, but it is not automatically an error: the correct requirement depends on the print workflow.
It does not convert RGB artwork to CMYK, assign ICC profiles, simulate a press, calculate ink coverage, or guarantee that a file satisfies a printer's complete preflight specification. A correct CMYK conversion needs a target output condition, not a generic one-click replacement.
For geometry problems, use the PDF Page Box Editor to inspect TrimBox, BleedBox, CropBox, MediaBox, and ArtBox.
Color space is only one part of print preparation. Page boxes, bleed, crop marks, and effective image resolution can matter independently.
Yes. Different objects inside a PDF can use different color spaces, so mixed files are possible.
No. It means RGB signals were found. Whether they are acceptable depends on the printer, RIP, output profile, and production requirements.
No. It is intentionally a checker. It does not rewrite colors or silently change profiles.
Your PDF is read by JavaScript running in your browser. Quicklio does not need to upload the document to a conversion server for this check. Large or unusually complex PDFs can still take longer because every page's drawing operations need to be inspected on your device.
PDF spot colors are commonly represented by named Separation or DeviceN color spaces. This checker surfaces those names when they are exposed in readable PDF structure.
