(distributed with MAME), newer alternatives cater to different user needs: Recalbox Wiki Ultimate ROM File Compression Guide (CHD, PBP, and RVZ)
A CHD converter online is a web-based tool that allows you to convert your CHD files to other formats, such as PDF, CSV, or image files. These online tools are designed to be easy to use and accessible from any device with an internet connection. With a CHD converter online, you can convert your files quickly and efficiently, without the need for specialized software or technical expertise. chd converter online
RomVault not only converts to CHD but also verifies checksums and organizes your entire ROM collection. (distributed with MAME)