TeraZip-Setup.msi is inside the 7z

TeraZip — Extreme Folder Compression for Image-Heavy Archives

Turn massive folders into dramatically smaller archives — fast.

TeraZip is a Windows folder archiver designed for collections containing large amounts of images, graphics and mixed files. Instead of treating every file as generic binary data,TeraZip

uses a specialized image compression pipeline and then applies powerful final compression using ZPAQ or BZIP3.

In one of our real-world tests, an approximately 24 GB folder was reduced to around 9 GB in about one hour. Performance and final size depend on the files, selected quality, CPU and compression mode.

Unlike extremely slow general-purpose compressors such as CMIX or NNCP, TeraZip is designed to obtain very strong compression on image-heavy folders while remaining practical enough for everyday use.

Key Features

• Compress complete folders and all subfolders into one .lossyzippro archive
• Specialized compression for PNG, JPG, WebP, AVIF, JXL, BMP, TGA and other image formats
• Non-image files are preserved as original binary data
• Restore images back to their original file format
• ZPAQ compression modes: -m1s, -m2s, -m3s, -m4s, -m5s
• BZIP3 compression support
• Multi-core CPU processing
• Automatic worker count based on available CPU cores
• GB-based progress display
• Estimated remaining time
• Elapsed time display
• Automatic temporary-file cleanup
• Preserves folder and subfolder structure
• Simple graphical Windows interface
• Designed for very large folders and datasets

Why TeraZip?

Traditional compressors must preserve every byte exactly, which limits how much already-compressed images can shrink.

TeraZip

takes a different approach.

Images can be intelligently reduced and recompressed before the final archive compression stage, while normal documents, executables, data files and other non-image files remain stored without this lossy image transformation.

This makes WinLossyZip Pro particularly suitable for:

photo collections, image datasets, website backups, graphics folders, AI datasets, game graphics, large media archives and storage reduction.

Example

Original folder: ~24 GB

TeraZip archive: ~9 GB

Processing time: ~1 hour in our tested configuration

That represents a reduction of approximately 62.5% in that particular test.

For large image-heavy collections, this approach can deliver a much more useful compression ratio versus processing-time balance than ultra-slow compressors such as CMIX or NNCP.

Important: TeraZip uses lossy processing for supported images. It is therefore not a direct like-for-like replacement for fully lossless compressors. Compression ratio, speed and reconstructed image quality vary depending on source material, quality settings, CPU and selected compression profile.

BENCHMARKS : 1025GB regular Folder TeraZip zpaq -m5s -q80 209GB in 3 days 4 workers

BENCHMARKS : 1025GB regular Folder 7z -ultra LMZ2 621GB in 1 days 4 workers