Choose a version:
39% The original file has 236202 bytes (230.7k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 91556 bytes (89.4k, 39%).

After GZIP compression these minified files vary in size:
Microsoft
  40885 bytes (39.9k)
CDN
Boot
  37139 bytes (36.3k)
CDN
cdnjs
  33191 bytes (32.4k)
CDN
Baidu
  32360 bytes (31.6k)
CDN
gzip -6 (default)
  32131 bytes (31.4k)
local copy
Google
  32111 bytes (31.4k)
CDN
cdnhttps
  32107 bytes (31.4k)
CDN
gzip -9
  32069 bytes (31.3k)
local copy
kzip -s0 -rn -b1
  30995 bytes (30.3k)
local copy
7zip -mx=9 -tgzip
  30972 bytes (30.2k)
local copy
libdeflate -12
  30924 bytes (30.2k)
local copy
Yandex
  30916 bytes (30.2k)
CDN
pigz -11 -n
  30908 bytes (30.2k)
local copy
Zopfli
  30873 bytes (30.1k)
local copy
Zopfli (defluff)
  30872 bytes (30.1k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-1.6.2.min.js

You will automatically get the smallest jQuery 1.6.2 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

Save 43 bytes by using my jQuery 1.6.2 Zopfli version instead of the best available CDN (0.14% smaller than Yandex, 30873 vs. 30916 bytes):
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 --mls16384 --bsr22 --lazy --ohh

(found January 8, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 16384  --mls16384
block splitting recursion 22  --bsr22
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

Even Smaller Files Thanks To Defluff

Zopfli's output can be further optimized by the defluff tool.
In this particular case, defluff saves 1 more byte (30872 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://code.jquery.com/jquery-1.6.2.min.js --location | md5sum
a1a8cb16a060f6280a767187fd22e037  -
curl --silent --compressed http://minime.stephan-brumme.com/files/jquery/jquery-1.6.2.min.zopfli.js.gz | md5sum
a1a8cb16a060f6280a767187fd22e037  -

SHA1:
curl --silent --compressed http://code.jquery.com/jquery-1.6.2.min.js --location | sha1sum
7622c9ac2335be6dcd3ab8b47132e94089cef931  -
curl --silent --compressed http://minime.stephan-brumme.com/files/jquery/jquery-1.6.2.min.zopfli.js.gz | sha1sum
7622c9ac2335be6dcd3ab8b47132e94089cef931  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Microsoft 40885 bytes a1a8cb16a060f6280a767187fd22e037 (invalid)
Google 32111 bytes a1a8cb16a060f6280a767187fd22e037 (invalid)
Yandex 30916 bytes a1a8cb16a060f6280a767187fd22e037 June 15, 2015 @ 21:17

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
Boot 37139 bytes 47c34b6cb8fed2e47d845003e2aaaddc < (function(a,b){function cv(a){return f.isWindow(a)?a:a.nod [...]
> (function(a,b){function cv(a){return f.isWindow(a)?a:a.nod [...]
March 18, 2015 @ 09:42
cdnjs 33191 bytes 47c34b6cb8fed2e47d845003e2aaaddc < (function(a,b){function cv(a){return f.isWindow(a)?a:a.nod [...]
> (function(a,b){function cv(a){return f.isWindow(a)?a:a.nod [...]
(invalid)
Baidu 32360 bytes 523374ede30cc244f8873725032ef75c only whitespaces differ January 7, 2015 @ 10:16
cdnhttps 32107 bytes 47c34b6cb8fed2e47d845003e2aaaddc < (function(a,b){function cv(a){return f.isWindow(a)?a:a.nod [...]
> (function(a,b){function cv(a){return f.isWindow(a)?a:a.nod [...]
December 24, 2015 @ 07:33

Note: only the MD5 hashes are shown to keep things simple.

Other Versions

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

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
30873 bytes -1 byte zopfli --i100000 --mls16384 --bsr22 --lazy --ohh January 8, 2016 @ 12:37
30874 bytes -1 byte zopfli --i100000 --mls16384 --bsr40 --lazy --ohh January 8, 2016 @ 10:19
30875 bytes -1 byte zopfli --i100000 --mls16384 --bsr14 --lazy --ohh January 8, 2016 @ 09:50
30876 bytes -3 bytes zopfli --i100000 --mls8192 --bsr9 --lazy --ohh September 2, 2015 @ 02:34
30879 bytes -3 bytes zopfli --i10000 --mls8192 --bsr9 --lazy --ohh September 1, 2015 @ 21:12
30882 bytes -11 bytes zopfli --i1000 --mls8192 --bsr9 --lazy --ohh September 1, 2015 @ 20:39
30893 bytes zopfli --i100 --mls8192 --bsr9 --lazy --ohh September 1, 2015 @ 20:22

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 @ 14:34.

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
30897 30895 30894 30897 30891 30897 30897 30888 30890 30888 30889 30886 30893 30894 30900
30885 30886 30883 30887 30884 30884 30884 30884 30886 30889 30886 30885 30883 30885 30882
30885 30885 30890 30885 30888 30887 30883 30885 30885 30884 30883 30886 30890 30881 30883
30886 30884 30884 30882 30886 30884 30886 30888 30886 30885 30884 30886 30883 30885 30884
30884 30884 30884 30885 30885 30888 30888 30887 30886 30885 30887 30889 30887 30874 30891
30884 30884 30885 30885 30883 30885 30886 30886 30886 30885 30887 30886 30876 30885 30895
30883 30886 30884 30884 30885 30885 30893 30887 30886 30884 30883 30885 30880 30875 30885
30886 30884 30883 30884 30886 30888 30883 30885 30886 30886 30883 30883 30884 30892 30885
30884 30885 30884 30883 30885 30884 30884 30886 30883 30888 30883 30883 30885 30884 30894
30888 30883 30890 30885 30887 30885 30884 30885 30882 30885 30883 30886 30885 30891 30884
30884 30884 30885 30883 30885 30884 30884 30884 30883 30885 30883 30886 30883 30875 30884
30883 30883 30884 30883 30884 30884 30884 30889 30892 30885 30883 30885 30886 30883 30885
30882 30885 30882 30881 30882 30886 30884 30887 30882 30885 30883 30886 30884 30884 30889
30883 30885 30884 30884 30884 30884 30883 30887 30886 30886 30885 30885 30887 30885 30884
30884 30885 30884 30883 30885 30888 30884 30885 30883 30891 30883 30886 30884 30878 30893
30885 30885 30887 30884 30886 30895 30884 30887 30883 30891 30883 30886 30883 30875 30886
30885 30885 30885 30885 30884 30885 30885 30886 30885 30886 30885 30888 30876 30880 30893
30887 30888 30885 30886 30886 30888 30885 30886 30886 30886 30883 30887 30881 30880 30885
30886 30885 30884 30885 30886 30883 30885 30885 30888 30886 30883 30887 30886 30873 30894
30885 30885 30883 30885 30887 30885 30884 30887 30886 30886 30883 30882 30886 30888 30895
30884 30885 30883 30883 30885 30886 30885 30886 30884 30886 30883 30886 30886 30883 30884
30887 30883 30883 30883 30883 30885 30884 30885 30880 30883 30883 30886 30884 30882 30895
30884 30884 30884 30886 30885 30883 30884 30887 30883 30885 30884 30887 30889 30874 30884

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 30891 bytes 100%
1,000 30882 bytes -9 bytes 100%
10,000 30878 bytes -4 bytes 100%
100,000 30873 bytes -5 bytes 2.61%
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
30996 bytes +123 bytes (+0.40%) +1 byte
30995 bytes +122 bytes (+0.40%)
31032 bytes +159 bytes (+0.52%) +37 bytes
31022 bytes +149 bytes (+0.48%) +27 bytes
31032 bytes +159 bytes (+0.52%) +37 bytes
31066 bytes +193 bytes (+0.63%) +71 bytes
31088 bytes +215 bytes (+0.70%) +93 bytes
31103 bytes +230 bytes (+0.74%) +108 bytes
31140 bytes +267 bytes (+0.86%) +145 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
ZPAQ (Wikipedia) zpaq zpaq -method 69 24820 bytes -6053 bytes (-19.61%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 25529 bytes -5344 bytes (-17.31%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 27099 bytes -3774 bytes (-12.22%)
Brotli (Wikipedia) brotli brotli -q 11 28422 bytes -2451 bytes (-7.94%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 28595 bytes -2278 bytes (-7.38%)
LZMA2 (Wikipedia) xz xz -9 29596 bytes -1277 bytes (-4.14%)
ZSTD (Wikipedia) zstd zstd -19 30234 bytes -639 bytes (-2.07%)

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