GZIP compressor/decompressor

Encoding/decoding

Compresses and decompresses Zlib- or GZIP-encoded data stream (RFC 1950/1952).

Compress Decompress
Data to process:	Max size of the input data is 10 MiB. ▲ clear By file upload: ▼ clear From URL (http[s], ftp[s]): ▼ clear By direct input: (UTF-8) Enter one or more wrappers (comma-separated): If necessary, enter initial data here: (UTF-8) Wrappers are executed in sequence on shared data string. For example, to supply base64-encoded stream of GZIP-compressed data enter wrappers: base64, gzip and fill the data input with the base64 stream. ¶ If data is not entered information from other tabs (upload, by URL and direct) is used to replace data on this page. This lets you enter gzip as a wrapper here and upload a file using upload tab while leaving data on this page empty. ¶ Currently supported wrappers are: base64, bzip, cslashes, datauri, direct, ftp, ftps, gzip, hex2bin, http, https, qprintable, upload, url, urlencoding, zlib. ¶ Upload By URL Direct input Custom Ctrl+Shift+E
Download result?	Yes, download.
GZIP-compatible encoding?	Yes

GZIP compression is a widely used method of compressing web pages and other text data – sometimes it can reduce the size of source document by 70-80% at the same time requiring little CPU processing. 

On this page you can encode or decode GZ data online. You can do so by direct imput, by file upload or by URL. Also, different variants of GZ compression are supported: 

• GZIP-compatible encoding means that your data (being compressed or uncompressed) is compatible with RFC 1952 and 3^rd party libraries like these. The stream has all the necessary headers so it'll be larger by a dozen of bytes. This is implemented using PHP gzencode / gzdecode functions.
  • Note: you can use this mode to extract GZ archives – simply select the checkbox «GZIP-compatible encoding», select your .gz file in upload, press «Decompress» and you'll get its contents.
• raw Zlib stream – this is just that bare compressed data essential for decompressing the source string back. This is implemented using PHP gzcompress / gzdecompress functions.

Getting gzdecode() work in PHP 4 and above 

As explained in this article, PHP has gzencode function to encode GZIP data but no gzdecode counterpart. However, it can be rewritten using readgzfile that will work in PHP 4+. 

// taken from http://proger.i-forge.net/gzdecode_doesnt_work_in_PHP_pre-6/OQB
function gzdecode($data) {
  do {
    $tempName = uniqid('temp ');
  } while (file_exists($tempName));

  if (file_put_contents($tempName, $data)) {
    try {
      ob_start();
        @readgzfile($tempName);
      $uncompressed = ob_get_clean();
    } catch (Exception $e) {
      $ex = $e;
    }

      unlink($tempName);

    if (isset($ex)) {
      throw $ex;
    }

    return $uncompressed;
  }
}