To achieve the absolute maximum compression ratio using the FreeArc console (arc.exe), you must go beyond the basic built-in presets and manually chain specialized pre-processors with ultra-level compression algorithms. This is the foundational technique used by famous internet software repackers to shrink massive datasets and game files. The Ultimate Maximum Compression Commands
Open your terminal or command prompt inside the FreeArc folder and use one of the following configurations. 1. Extreme Compression Chaining (Recommended)
This command disables automatic selection (-ma-), enforces solid archiving (-s), and chains a 2GB repetition filter, multimedia detection, delta filtering, binary executable pre-processing, and an ultra-tuned LZMA dictionary:
arc a -s -ma- -m=rep:2048mb+mm+delta+dispack+lzma:ultra:170mb archive_name.arc “C:\path\to\your\files” Use code with caution. 2. The Absolute Maximum (Requires Precomp and SREP)
If your dataset contains pre-compressed data (like .caf, .pdf, .png) and massive duplicate chunks across gigabytes of data, you can chain external tools like Precomp and SREP inside FreeArc. Note that this takes a massive amount of time and RAM:
arc a -s -ma- -m=precomp042:c-:intense+srep:m3f:mem256mb+mm+dispack070+delta+lzma:max:512mb archive_name.arc “C:\path\to\your\files” Use code with caution. 3. High-Asymmetric Compression (Fast Extraction)
If you need maximum compression but want the file to extract 8 times faster using very little memory on the end-user’s machine, use the -m9x switch: arc a -m9x -s archive_name.arc “C:\path\to\your\files” Use code with caution. Key Switches Breakdown
How to achieve maximum compression with FreeArc! : r/compression
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