Data Compression & Decompression Portal

Compress or decompress any file losslessly using DEFLATE (industry standard) or LZ77 algorithms. Upload a file below, choose an action, then confirm before download.

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Supports any file type (Max: 60MB)

File Name

0 KB

Type

DEFLATE Algorithm

Industry standard (used in ZIP, PNG)

LZ77 Algorithm

Dictionary-based sliding window

Processing time: 0ms

Compression Algorithms Explained

DEFLATE Algorithm

DEFLATE is the industry-standard compression algorithm used in ZIP files, PNG images, and GZIP. It combines two techniques:

  • LZ77 Compression: Replaces repeated sequences with references
  • Huffman Coding: Encodes data using variable-length codes

This implementation uses the browser's native Compression API for maximum reliability and performance.

LZ77 Algorithm

LZ77 is a foundational algorithm that uses a sliding window technique:

  • Scans data for repeated patterns
  • Replaces duplicates with (distance, length) pointers
  • Works well for text, binary files, and images

This custom implementation provides a good balance between compression ratio and processing speed.