Image Colorspace Converter
Convert an image to another colorspace or bit depth. Choose 8-bit sRGB, 8-bit grayscale, 16-bit RGB or 16-bit grayscale PNG for web, archive and editing workflows, or CMYK TIFF with LZW compression for print preparation. The conversion uses color managed transforms, so grayscale follows perceived brightness and CMYK separations are calculated with a standard profile.
Frequently asked questions
Which colorspaces can I convert to?
You can choose sRGB (8-bit PNG), grayscale (8-bit PNG), RGB 16-bit (PNG), grayscale 16-bit (PNG) and CMYK (TIFF). sRGB is the default and matches the web standard. Lab output is not offered, because common file formats do not store it reliably.
Why is CMYK saved as TIFF?
PNG cannot store CMYK, and TIFF is the lossless standard that print workflows accept. The file uses LZW compression to stay compact without losing data. A JPEG would add compression artifacts to the separation.
How is the CMYK conversion calculated?
The image is converted from sRGB to CMYK with a color managed transform using the built in CMYK profile of libvips. This gives a usable generic separation. For a specific press or paper, convert again with the profile your printer provides.
What happens to transparency?
sRGB, grayscale and 16-bit outputs keep the alpha channel. CMYK output drops transparency, because print files are opaque, and transparent areas show the colors stored behind them. Flatten the image onto white first with Image Flatten if those areas should be white.
Does 16-bit output improve quality?
Uploads are decoded at 8 bits per channel, so converting to 16-bit does not add detail. It produces a 16-bit file that leaves headroom for later editing without banding and meets workflows that require 16-bit masters. The values are scaled precisely from the 8-bit source.
How is the grayscale conversion done?
Grayscale uses the libvips colorimetric conversion, which weights red, green and blue by how bright they appear to the eye. The result looks natural rather than flat. Choose 16-bit grayscale for smoother gradients in later edits.
Can I convert CMYK images to sRGB?
Yes, upload a CMYK JPEG or TIFF and choose sRGB. The image is converted to RGB when it is decoded and saved as an 8-bit sRGB PNG suitable for the web.
Which formats can I upload?
JPEG, PNG, GIF, WebP, TIFF and AVIF images up to 5 MB are supported. Animated files use their first frame and images over 4000 pixels on a side are scaled down to fit.
Will my CMYK file be print ready?
It will be a valid CMYK TIFF that layout programs and printers can open. Professional print jobs usually also need the right resolution, bleed and a press specific profile, so check the requirements of your printer.
What engine performs the conversion?
The tool uses the toColourspace operation of the sharp library, which relies on libvips and Little CMS for color management. The result is deterministic.