RAR is a archive format: it compresses files with the proprietary RAR algorithm, typically achieving better ratios than ZIP for mixed-content archives. JAR is a document format that stores data in the JAR format. This extracts the document from the archive so it can be opened directly. Metadata such as creation date and embedded colour profiles is preserved where the target format supports it. Converting between these two formats is common when the source application does not support JAR natively or when the target platform only accepts JAR. 1converter processes this conversion server-side using open-source tools. Files are transferred over HTTPS, converted on secure cloud servers, and automatically deleted after 24 hours.