Before you hit "convert," it is important to understand what these files actually do.
Online converters frequently strip out important header info: the input color space (Rec.709, Log, etc.), output range (full/video levels), and creator notes. The resulting .cube may technically work, but colors can shift because the converter assumes generic RGB.
Turn off "dynamic" settings like Grain, Vignette, Lens Correction, and Sharpening, as these break the LUT's color-mapping logic.
XMP files rely on Adobe’s specific rendering engine. Ten years from now, how will you apply today’s Lightroom edits? By converting them to open-standard CUBE files, you ensure your creative looks remain usable indefinitely.
Download a free offline tool like Lattice once, and save yourself the headache of re-converting files with altered color science.