Choose a version:
36% The original file has 56993 bytes (55.7k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 20525 bytes (20.0k, 36%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  10546 bytes (10.3k)
local copy
gzip -9
  10545 bytes (10.3k)
local copy
libdeflate -12
  10331 bytes (10.1k)
local copy
7zip -mx=9 -tgzip
  10224 bytes (10.0k)
local copy
kzip -s0 -rn -b2
  10159 bytes (9.9k)
local copy
pigz -11 -n
  10149 bytes (9.9k)
local copy
Zopfli
  10123 bytes (9.9k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-1.1.pack.js (or via HTTPS)

You will automatically get the smallest jQuery 1.1 file, ETag caching is available and
if your browser doesn't support GZIP decompression then the uncompressed version will be sent.

Currently best Zopfli settings

You can use my super-compressed files for whatever purpose you like as long as you respect the library's original license agreement.
There are no restrictions from my side - but please avoid hot-linking if you run a high-traffic website.

These command-line settings yielded the best compression ratio so far (Linux version of zopfli-krzymod):
zopfli --i100000 --mb8 --mls128 --bsr12 --lazy --ohh

(found January 4, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 128  --mls128
block splitting recursion 12  --bsr12
lazy matching in LZ77 yes  --lazy
optimized Huffman headers yes  --ohh
initial random W for iterations 1  --rw1
initial random Z for iterations 2  --rz2

Verify file integrity

After decompression, my uncompressed files are identical to the original ones:

MD5:
curl --silent --compressed https://code.jquery.com/jquery-1.1.pack.js --location | md5sum
3733a2e19f38047f96b0cf8313ce92b8  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.1.pack.zopfli.js.gz | md5sum
3733a2e19f38047f96b0cf8313ce92b8  -

SHA1:
curl --silent --compressed https://code.jquery.com/jquery-1.1.pack.js --location | sha1sum
16306f8187df578589821e6eb6b807ac4d467d1f  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.1.pack.zopfli.js.gz | sha1sum
16306f8187df578589821e6eb6b807ac4d467d1f  -

Other Versions

Available jQuery versions at minime.stephan-brumme.com:

3.3.1, 3.3.0,
3.2.1, 3.2.0,
3.1.1, 3.1.0,
3.0.0,
2.2.4, 2.2.3, 2.2.2, 2.2.1, 2.2.0,
2.1.4, 2.1.3, 2.1.2, 2.1.1, 2.1.0,
2.0.3, 2.0.2, 2.0.1, 2.0.0,
1.12.4, 1.12.3, 1.12.2, 1.12.1, 1.12.0,
1.11.3, 1.11.2, 1.11.1, 1.11.0,
1.10.2, 1.10.1, 1.10.0,
1.9.1, 1.9.0,
1.8.3, 1.8.2, 1.8.1, 1.8.0,
1.7.2, 1.7.1, 1.7.0,
1.6.4, 1.6.3, 1.6.2, 1.6.1, 1.6,
1.5.2, 1.5.1, 1.5,
1.4.4, 1.4.3, 1.4.2, 1.4.1, 1.4,
1.3.2, 1.3.1, 1.3,
1.2.6, 1.2.5, 1.2.4, 1.2.3, 1.2.2, 1.2.1, 1.2,
1.1.4, 1.1.3, 1.1.2, 1.1.1, 1.1,
1.0.4, 1.0.3, 1.0.2, 1.0.1, 1.0

The project site contains an overview how well these versions were compressed.
Other interesting projects are AngularJS, BackboneJS, Bootstrap, D3, Dojo, Ember, Knockout, lodash, React, Socket.IO, ThreeJS, UnderscoreJS and Vue.

Changelog

Best Zopfli parameters so far:
Size Improvement Parameters Found
10123 bytes -1 byte zopfli --i100000 --mls128 --bsr12 --lazy --ohh January 4, 2016 @ 15:43
10124 bytes -1 byte zopfli --i100000 --mls32 --bsr8 --lazy --ohh November 23, 2015 @ 15:15
10125 bytes -1 byte zopfli --i100000 --mls4 --bsr23 --lazy --ohh November 23, 2015 @ 11:09
10126 bytes -1 byte zopfli --i10000 --mls8 --bsr11 --lazy --ohh November 23, 2015 @ 10:44
10127 bytes -1 byte zopfli --i10000 --mls4 --bsr7 --lazy --ohh November 23, 2015 @ 08:24
10128 bytes -1 byte zopfli --i1000 --mls4 --bsr7 --lazy --ohh September 22, 2015 @ 04:39
10129 bytes -1 byte zopfli --i1000 --mls8 --bsr11 --lazy --ohh September 20, 2015 @ 15:08
10130 bytes -1 byte zopfli --i1000 --mls128 --bsr6 --lazy --ohh September 16, 2015 @ 18:34
10131 bytes -2 bytes zopfli --i1000 --mls128 --bsr7 --lazy --ohh September 16, 2015 @ 18:32
10133 bytes zopfli --i100 --mls64 --bsr16 --lazy --ohh September 11, 2015 @ 16:48

If there are multiple parameter sets yielding the same compressed size, only the first one found is shown.

Most recent activity on June 16, 2016 @ 14:41.

Heatmaps

This Zopfli heatmap visualizes how compression changes when modifying the --bsr and --mls parameter.
Cell's contents is the best filesize achieved (in bytes, hover with mouse over cells to see number of iterations).

Good parameters are green, bad are red. The best and worst are bold as well.
The brightness of the blue background color indicates how many iterations were processed:
10,000 or 100,000.
bsr \ mls
2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768
bsr \ mls
2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 32768
10168 10163 10166 10163 10163 10165 10163 10170 10167 10164 10161 10176 10170 10169 10180
10170 10159 10144 10180 10160 10174 10160 10161 10139 10130 10131 10142 10141 10143 10136
10131 10128 10137 10137 10138 10136 10128 10140 10138 10129 10135 10133 10142 10138 10140
10130 10127 10125 10136 10133 10135 10127 10134 10134 10127 10133 10135 10141 10137 10134
10134 10137 10138 10138 10124 10136 10145 10137 10134 10128 10133 10134 10140 10134 10136
10132 10128 10135 10127 10129 10136 10127 10136 10127 10141 10132 10140 10135 10134 10137
10127 10128 10134 10135 10140 10136 10130 10134 10134 10130 10129 10138 10135 10132 10131
10135 10133 10125 10128 10132 10139 10135 10136 10133 10127 10130 10131 10134 10133 10132
10130 10127 10130 10133 10128 10136 10123 10135 10127 10127 10132 10139 10135 10134 10130
10128 10127 10140 10136 10137 10145 10139 10128 10128 10128 10132 10134 10130 10135 10134
10130 10144 10127 10139 10129 10139 10129 10134 10133 10125 10132 10136 10140 10131 10135
10128 10134 10136 10136 10134 10130 10128 10128 10134 10127 10132 10135 10134 10143 10138
10133 10125 10128 10131 10128 10131 10130 10128 10129 10129 10132 10136 10134 10136 10130
10132 10130 10127 10128 10132 10139 10130 10130 10128 10127 10130 10134 10133 10133 10132
10127 10129 10135 10130 10135 10134 10134 10134 10135 10129 10128 10131 10133 10138 10142
10134 10145 10132 10134 10129 10135 10138 10134 10128 10125 10133 10136 10133 10140 10141
10128 10128 10128 10127 10128 10128 10128 10134 10133 10127 10130 10133 10134 10136 10137
10133 10128 10136 10129 10133 10129 10127 10136 10136 10128 10130 10134 10134 10139 10137
10128 10128 10130 10127 10131 10132 10129 10128 10133 10128 10132 10134 10133 10135 10137
10135 10125 10136 10134 10127 10138 10127 10137 10133 10128 10135 10134 10134 10136 10136
10145 10127 10136 10133 10132 10135 10127 10134 10133 10127 10132 10130 10130 10138 10140
10131 10127 10134 10128 10129 10124 10128 10130 10134 10125 10132 10137 10133 10133 10136
10132 10131 10134 10135 10137 10135 10124 10135 10137 10128 10130 10137 10134 10135 10131

Due to the Monte Carlo design of my search algorithm, not all parameters have reached the same number of iterations yet:
Iterations Min. Bytes Reduction Coverage
100 10129 bytes 100%
1,000 10128 bytes -1 byte 100%
10,000 10125 bytes -3 bytes 100%
100,000 10123 bytes -2 bytes 3.19%
1,000,000
10,000,000

KZIP has far less options available for tuning/optimization. I only played around with the number of blocks (parameter -n):
Blocks Min. Bytes Compared To Best Zopfli Compared To Best KZIP
10159 bytes +36 bytes (+0.36%)
10324 bytes +201 bytes (+1.99%) +165 bytes
10159 bytes +36 bytes (+0.36%)
10160 bytes +37 bytes (+0.37%) +1 byte
10183 bytes +60 bytes (+0.59%) +24 bytes
10180 bytes +57 bytes (+0.56%) +21 bytes
10211 bytes +88 bytes (+0.87%) +52 bytes
10241 bytes +118 bytes (+1.17%) +82 bytes
10266 bytes +143 bytes (+1.41%) +107 bytes

Non-DEFLATE Algorithms

Archivers based on completely different compression algorithms often produce superior results.
Unfortunately, browsers only support gzip compression at the moment.
Algorithm Program Parameters Size Compared To Best Zopfli
Brotli (Wikipedia) brotli brotli -q 11 9377 bytes -746 bytes (-7.37%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 9738 bytes -385 bytes (-3.80%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 9818 bytes -305 bytes (-3.01%)
ZPAQ (Wikipedia) zpaq zpaq -method 69 9944 bytes -179 bytes (-1.77%)
LZMA2 (Wikipedia) xz xz -9 10004 bytes -119 bytes (-1.18%)
Zstandard (Wikipedia) zstd zstd -19 10313 bytes +190 bytes (+1.88%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 10612 bytes +489 bytes (+4.83%)

Detailled Analysis

I wrote a DEFLATE decoder in Javascript. Click the button below to start a client-side analysis of the smallest gzipped files (may take a second):


Notes: pigz is a fast open source multi-threaded implementation of gzip written by one of the original authors of gzip.
However, when using compression level 11, pigz actually switches to the slower Zopfli algorithm and isn't multi-threaded anymore.
KrzyMOD's extensions to Zopfli offer the highest level of configuration and is therefore used for my brute-force search.
Ken Silverman wrote the closed-source KZIP compression program and Jonathon Fowler ported it to Linux.
Defluff was created by Joachim Henke; DeflOpt is a tool by Ben Jos Walbeehm.

website made by Stephan Brumme in 2015 and still improving in 2018.
all timestamps are displayed in central european time. see my changelog.
no flash, not even images or external css files - and everything squeezed into a single html file.
which was handsomely compressed before releasing it into the wild internet - obviously.

please visit my homepage and my blog, too.
email: minime (at) stephan-brumme.com