When this tool is useful
Preparing monochrome drafts, neutral reference images, printable handouts, and reduced-color visual assets.
How local processing works
The browser decodes the image, converts each pixel's color channels to a luminance-based gray value while retaining alpha, then encodes a new file in the source format.
How to use it
- Choose the source files.
- Review the available settings and page order.
- Process locally, inspect the result, and download it.
Important limitations
Discarded color cannot be recovered from the output. Files are re-encoded, metadata and animation are not preserved, and this is not a calibrated prepress color-conversion workflow.
Private by design
Your files stay in this browser. The tool does not upload the source or output to our servers.
Questions and answers
Does this tool upload my files?
No. Processing happens in your browser; closing the page clears the working session.
Will the output always match the source exactly?
Discarded color cannot be recovered from the output. Files are re-encoded, metadata and animation are not preserved, and this is not a calibrated prepress color-conversion workflow.