B1 Archiver vs FileOptimizer

B1 Free Archiver creates and extracts archives, with desktop software, an Android app and an online archiver. The desktop application creates B1 and ZIP archives and supports almost 40 formats, including RAR, RAR5 and 7z. The online tool extracts files from B1, ZIP, RAR, 7z and other archive types. On Android, B1 also works as a file manager. The B1 format supports password protection using 256-bit AES encryption, and the desktop archiver checks archive integrity with Adler-32 before unpacking. B1 says files uploaded to its online archiver are deleted a few minutes after the page is closed. Its privacy policy says it does not knowingly collect identifying personal data, though it may collect non-personally identifiable server information such as IP address and browser type. The policy also says app and device usage data, including location and network performance, may be collected for anonymous ad-related use in B1 apps. Support is by email and in English only. B1 is free for personal and commercial use, with no registration.

FileOptimizer is a free Windows program that recompresses already-compressed files to reduce their size while retaining their format and behavior. It supports batch processing and accepts files through its interface or command line; optimization replaces them with optimized versions. The maker says it handles more than 600 file extensions and identifies types by examining file contents, regardless of extension. Listed formats include APNG, AVIF, BMP, BPG, DDS, DNG, GIF, HEIC, HEIF, ICO, J2C, J2K, JP2, JPEG, JPG, JXL, MNG, MPO, PCX, PNG, PSD, SVG, TGA, TIF, TIFF, and WEBP. By default, it removes extra metadata and keeps originals in the recycle bin. The program includes more than 90 third-party tools as plugins and supports command-line automation. It is provided under the GNU Affero General Public License, free for personal and commercial use without feature limits. The maker lists Windows XP through Windows 11 and Server 2022 among its requirements. Lossy options are also documented for PNG, JPEG, and GIF.