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 02 May 2007
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Compression Comparison Guide Rev. 2.0
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E-Books

Compression Rate

Data Compressors
Original Size (bytes)
Compressed Size (bytes)
Space Saved (bytes)
WinRK
200,009,231
171,589,752
28,419,479
7-Zip
200,009,231
174,660,146
25,349,085
WinRAR
200,009,231
174,765,360
25,243,871
Squeez
200,009,231
175,161,770
24,847,461
WinAce
200,009,231
175,255,989
24,753,242
SBC Archiver
200,009,231
175,259,830
24,749,401
StuffIt
200,009,231
175,814,368
24,194,863
WinZip
200,009,231
176,998,548
23,010,683
bzip2
200,009,231
177,020,566
22,988,665
gzip
200,009,231
177,651,708
22,357,523
ARJ32
200,009,231
177,724,449
22,284,782

Even when it comes to PDF files, WinRK was the best at compression. It was ahead of the rest of the pack by reducing the fileset size to under 172MB, which is a size reduction of 14.2%. The runner-up, 7-Zip, managed to reduce the fileset size by over 25MB or 12.7%.

WinRAR, Squeez, WinAce and SBC Archiver were all close behind 7-Zip. The other compressors generated slightly larger archives, but they were all generally good at compressing this fileset. Even the worse compressor, ARJ32, managed to achieve a size reduction of over 22.2MB.

 

Compression Speed

Data Compressors
Original Size (bytes)
Time (s)
Speed (KB/s)
gzip
200,009,231
13.13
15233.0
WinZip
200,009,231
19.99
10005.5
ARJ32
200,009,231
20.11
9945.8
bzip2
200,009,231
49.51
4039.8
7-Zip
200,009,231
59.49
3362.1
StuffIt
200,009,231
86.72
2306.4
SBC Archiver
200,009,231
89.24
2241.3
Squeez
200,009,231
91.48
2186.4
WinRAR
200,009,231
109.83
1821.1
WinAce
200,009,231
170.00
1176.5
WinRK
200,009,231
411.88
485.6

When it came to compression speed, however, gzip was king. It only took 13 seconds to compress the 200MB fileset. It was over 50% faster than its nearest competitors, WinZip and ARJ32.

WinRK was, again, the slowest compressor tested. This time, it was especially long. It actually took over 6 minutes to complete the test! However, this is actually faster than the 8 minutes it took when it was set to its fastest compression setting.

 

Compression Efficiency

The compression efficiency rating is a simple way to evaluate the efficiency of each data compressor. This way, we can see which compressor can save the most space in the least time.

Please note that a higher efficiency rating does not mean the compressor is better. It just means the compressor has a better compression-to-speed ratio. A more efficient compressor is, of course, always more desirable than a less efficient one.

The most efficient data compressor when it comes to this bunch of PDF files was gzip. Its tremendously fast compression speed with its good compression rate allowed it to become the undisputed efficiency champion for PDF files.

The PDF compression king, WinRK, ended up as the most inefficient compressor in this comparison due entirely to its slow performance. The extremely long time it took to compress the fileset completely offset the amount of space saved.



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