What is a CDG file?
A .CDG file typically contains karaoke graphics and lyrics. This format follows the Compact Disc+Graphics (CD+G) standard originally developed by Philips and Sony. The file stores low-resolution graphics, such as lyrics that change color in sync with music. A karaoke .CDG file does not contain audio itself. It must be paired with an audio file, usually an .MP3, to work properly.
Alternatively, a .CDG file can be a UML Class Diagram. Software developers use this XML-based format to map out program structures. These files are often created using the NetBeans Class Diagrammer plugin or StarUML.
How to open CDG files?
If your file is a karaoke graphic, you need dedicated playback software. Popular options include KaraFun Player and Power CD+G Player. If the file is a UML Class Diagram, you can open it with StarUML or any standard code editor.
Because .CDG has multiple possible meanings, viewer.online/cdg analyzes .CDG files to identify their exact format and creator software, shows which programs can open the file, and usually previews it.
Best practices and troubleshooting
A common issue with karaoke .CDG files is missing audio. For a karaoke player to work, the .CDG file and the audio file must share the exact same name and sit in the exact same folder (for example, `track1.cdg` and `track1.mp3`). If you open the file and see XML text, your file is a developer diagram, not a karaoke track.
File Conversion
If you want to play karaoke files on standard devices, you should convert the .CDG and its audio pair into a single video format. We recommend file conversion to sensible target formats on convert.guru. Converting to .MP4 or .AVI makes the file playable on almost any device.
Summary
viewer.online/cdg directly opens and previews .CDG files in the browser, eliminating the need to install software or troubleshoot compatibility issues.