Archive Compressor
Optimize poorly compressed ZIP files. This tool unpacks the archive in your browser's RAM and aggressively repacks it using the maximum DEFLATE algorithm.
Click or drag a ZIP archive here
Maximum recommended size: 500MBReality Check: If the original ZIP was already created using maximum compression, repacking it will yield zero size reduction. This tool is for uncompressed ("Store") or fast-compressed archives.
Archive Rebuilding Standards
In-Memory Extraction
The uploaded ZIP is parsed and extracted directly into your browser's RAM array buffers. The files never touch a hard drive or external server.
DEFLATE Level 9
By forcing the algorithm to Level 9, the compressor spends maximum CPU cycles searching for redundancies across the file binaries, minimizing the output footprint.
Solid Compression Limits
Standard ZIP files compress items individually. If you have an archive containing highly repetitive files, rebuilding it will still be limited by the ZIP format's lack of solid block compression (unlike 7z/RAR).