Gzip Encode Decode

About Gzip Encode Decode

This gzip tool compresses text to gzip format and decompresses gzip data back to text. The compressed output is Base64-encoded for easy copy and paste. Uses the pako library in the browser.

Gzip Compression Algorithm

// Gzip compression using pako (DEFLATE algorithm)
function compress(text) {
  const encoder = new TextEncoder();
  const data = encoder.encode(text);
  const compressed = pako.gzip(data);
  // Convert to Base64 for safe text representation
  return btoa(String.fromCharCode.apply(null, compressed));
}

// Gzip decompression
function decompress(base64) {
  const binary = atob(base64);
  const bytes = new Uint8Array(binary.length);
  for (let i = 0; i < binary.length; i++) {
    bytes[i] = binary.charCodeAt(i);
  }
  const decompressed = pako.ungzip(bytes);
  return new TextDecoder().decode(decompressed);
}

Compression Ratio Examples

Common Use Cases

• HTTP Compression: Enable gzip on web servers to reduce bandwidth (Content-Encoding: gzip)
• Log Compression: Compress log files for archival and storage efficiency
• Data Transmission: Reduce payload size for API requests and responses
• Frontend Optimization: Compress static assets (CSS, JS, HTML) for faster page loads