RAR Archive (RAR) compresses files with the proprietary RAR algorithm, typically achieving better ratios than ZIP for mixed-content archives. ZST file (ZST) stores data in the ZST 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. The result is a standard ZST file readable by any compatible application. 1converter handles RAR-to-ZST conversion server-side: files are uploaded over HTTPS, processed on isolated cloud infrastructure, and the converted output is available for download for 24 hours before automatic deletion. No account is required for standard conversions.