Try out BumpMesh.com!

BumpMesh is a free, open-source, browser-based tool for applying custom displacement textures to your 3D models - no account, no software install, and no expensive licenses required. Simply load your STL, OBJ, or 3MF file, choose or upload a texture, adjust projection, depth, and masking to your liking, and export a print-ready mesh in minutes. Whether you want to hide Z-seams, add grip, stiffen vase mode prints, or just make your parts look stunning, BumpMesh gives you professional-quality surface texturing completely for free at BumpMesh.com.

Please don't break it ;-)