An SNB file is a note created by S Note, an advanced note-taking application developed by Samsung for use with Samsung mobile devices, such as Galaxy S and Galaxy Note. It contains a note, which may include text, video, audio, sketches, and images. SNB files were replaced by .SPD files.

Notes created with S Note can be synced across devices including a PC. SNB files can be exported to .JPG or .PDF files from the S Note app. You can also back up SNB files by syncing them to Google Drive by tapping the the three-line icon in the top right-hand corner, selecting "Sync", choosing "Google". You can open SNB files in the Samsung Notes app on your Samsung device. In Windows, you can convert SNB files to PDF files on your computer using snbopen. You can also open SNB files in Windows or macOS by replacing the ".snb" extension with ".zip" to create a .ZIP file. You can then extract the contents with a Zip decompression program, such as Microsoft File Explorer, Corel WinZip, or Apple Archive Utility.