B1 Archiver vs lrzip

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.

lrzip is a free GPL-2.0 command-line utility for compressing large files, usually above 10–50 MB. It first applies an extended rzip pass to reduce long-distance redundancy, then uses a backend such as LZMA, ZPAQ, LZO, GZIP, or BZIP2. Users can favor speed or smaller output, but not both simultaneously. Compression and decompression are heavily multithreaded, with CPU detection, and compression windows can use available RAM. Sliding mmap can exceed physical RAM but may be extremely slow. Encryption uses AES-256-GCM with PBKDF2-HMAC-SHA512 and HKDF; forgotten passwords cannot be recovered. The main program handles single files, while lrztar packages directories. It targets 64-bit Unix-like systems and supports macOS 10.5 or later from version 0.43. Building uses configure and make. Archive output is LRZ or TAR-compressed LRZ, with stable source releases on GitHub.