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Article 192

MODE Z / zlib

On-the-Fly Compression

Faster data transfers

Mode Z compression compresses files-on-the-fly as they are being transferred from the local computer to the remote computer and remote to local, saving bandwidth and improving transfer time.

Webmasters and server administrators will see an increase in productivity. Transfers of html, scripts or large logfiles (which are text) no longer need to be zipped before being sent via ftp and should generally experience a 3-4 times gain in data transfer time.

For example, a 60MB log file can turn into a 5MB data exchange when transferred with MODE Z enabled.

Depending on the file content, you will see different results.

Typical gains :
- Text files : ~15-20% of original size
- HTML files : ~25-30% of original size
- Media, Video, Sound : ~90-95% of original size

Note : Already compressed documents with Zip, Rar, Ace etc. will not see a noticeable gain.

How To

  1. Select the Tools tab
  2. Click on Favorite Properties
  3. Go to Transfer - Compression
  4. Configure the Mode Z settings

Server Support
ProFTPD (mod_deflate), Serv-U, FileZilla Server


  1. Draft: Deflate transmission mode for FTP
  2. zlib

slow transfer zlib mode z compression

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