Choose a version:
33% The original file has 294161 bytes (287.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 97362 bytes (95.1k, 33%).

After GZIP compression these minified files vary in size:
Microsoft
  43431 bytes (42.4k)
CDN, direct link
Boot
  39543 bytes (38.6k)
CDN, direct link
gzip -6 (default)
  33899 bytes (33.1k)
local copy
cdnhttps
  33871 bytes (33.1k)
CDN, direct link
cdnjs
  33871 bytes (33.1k)
CDN, direct link
jsdelivr
  33871 bytes (33.1k)
CDN, direct link
unpkg
  33871 bytes (33.1k)
CDN, direct link
Google
  33845 bytes (33.1k)
CDN, direct link
gzip -9
  33841 bytes (33.0k)
local copy
7zip -mx=9 -tgzip
  32724 bytes (32.0k)
local copy
libdeflate -12
  32709 bytes (31.9k)
local copy
Yandex
  32649 bytes (31.9k)
CDN, direct link
pigz -11 -n
  32648 bytes (31.9k)
local copy
kzip -s0 -rn -b4
  32647 bytes (31.9k)
local copy
Zopfli
  32626 bytes (31.9k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-1.12.0.min.js

You will automatically get the smallest jQuery 1.12.0 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 23 bytes by using my jQuery 1.12.0 Zopfli version instead of the best available CDN (0.07% smaller than Yandex, 32626 vs. 32649 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 --i1000000 --mb8 --mls2048 --bsr23 --lazy --ohh

(found January 11, 2016)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 2048  --mls2048
block splitting recursion 23  --bsr23
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 http://code.jquery.com/jquery-1.12.0.min.js --location | md5sum
cbb11b58473b2d672f4ed53abbb67336  -
curl --silent --compressed http://minime.stephan-brumme.com/files/jquery/jquery-1.12.0.min.zopfli.js.gz | md5sum
cbb11b58473b2d672f4ed53abbb67336  -

SHA1:
curl --silent --compressed http://code.jquery.com/jquery-1.12.0.min.js --location | sha1sum
66f47b885d587aa9a6c453ae3f2c9a382e5c7ec7  -
curl --silent --compressed http://minime.stephan-brumme.com/files/jquery/jquery-1.12.0.min.zopfli.js.gz | sha1sum
66f47b885d587aa9a6c453ae3f2c9a382e5c7ec7  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Microsoft 43431 bytes cbb11b58473b2d672f4ed53abbb67336 January 8, 2016 @ 23:51
Boot 39543 bytes cbb11b58473b2d672f4ed53abbb67336 January 10, 2016 @ 20:07
cdnhttps 33871 bytes cbb11b58473b2d672f4ed53abbb67336 November 22, 2016 @ 16:35
cdnjs 33871 bytes cbb11b58473b2d672f4ed53abbb67336 January 9, 2016 @ 05:46
jsdelivr 33871 bytes cbb11b58473b2d672f4ed53abbb67336 January 16, 2016 @ 17:33
unpkg 33871 bytes cbb11b58473b2d672f4ed53abbb67336 July 11, 2016 @ 15:39
Google 33845 bytes cbb11b58473b2d672f4ed53abbb67336 January 12, 2016 @ 22:20
Yandex 32649 bytes cbb11b58473b2d672f4ed53abbb67336 (invalid)

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
32626 bytes -1 byte zopfli --i1000000 --mls2048 --bsr23 --lazy --ohh January 11, 2016 @ 14:07
32627 bytes -1 byte zopfli --i100000 --mls2048 --bsr23 --lazy --ohh January 10, 2016 @ 09:39
32628 bytes -1 byte zopfli --i100000 --mls32768 --bsr7 --lazy --ohh January 10, 2016 @ 09:14
32629 bytes -1 byte zopfli --i10000 --mls32768 --bsr7 --lazy --ohh January 9, 2016 @ 14:34
32630 bytes -1 byte zopfli --i10000 --mls2048 --bsr16 --lazy --ohh January 9, 2016 @ 08:17
32631 bytes -3 bytes zopfli --i1000 --mls32 --bsr25 --lazy --ohh January 9, 2016 @ 08:15
32634 bytes -2 bytes zopfli --i1000 --mls2048 --bsr16 --lazy --ohh January 9, 2016 @ 08:12
32636 bytes zopfli --i100 --mls2048 --bsr7 --lazy --ohh January 9, 2016 @ 08:07

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

Most recent activity on November 22, 2016 @ 16:35.

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, 100,000 or 1,000,000.
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
32641 32641 32641 32641 32640 32638 32637 32639 32639 32642 32642 32642 32647 32647 32642
32638 32634 32636 32634 32636 32634 32637 32637 32637 32636 32635 32638 32647 32635 32636
32638 32638 32638 32633 32638 32639 32640 32641 32642 32641 32636 32636 32633 32636 32634
32639 32631 32638 32638 32650 32638 32638 32638 32640 32639 32626 32635 32633 32634 32628
32631 32633 32641 32632 32640 32638 32637 32639 32639 32642 32642 32636 32633 32636 32637
32634 32633 32631 32633 32632 32638 32639 32638 32637 32640 32632 32638 32633 32635 32636
32634 32634 32634 32634 32638 32638 32638 32638 32638 32639 32632 32635 32633 32636 32634
32634 32632 32639 32633 32640 32638 32638 32638 32637 32640 32632 32636 32636 32636 32627
32638 32638 32639 32637 32638 32638 32638 32639 32637 32639 32638 32636 32633 32634 32634
32634 32633 32631 32631 32638 32638 32638 32638 32641 32640 32637 32636 32631 32636 32633
32638 32631 32640 32638 32637 32638 32638 32638 32637 32640 32636 32636 32633 32633 32634
32634 32638 32631 32631 32633 32637 32638 32638 32639 32640 32632 32635 32633 32636 32633
32634 32634 32632 32630 32634 32634 32638 32638 32638 32640 32626 32635 32633 32635 32632
32633 32632 32633 32635 32639 32635 32638 32638 32639 32640 32637 32635 32633 32636 32635
32634 32631 32631 32633 32633 32638 32636 32638 32637 32639 32633 32636 32636 32636 32634
32634 32633 32631 32634 32636 32638 32638 32638 32638 32639 32637 32635 32636 32636 32633
32640 32629 32633 32633 32631 32637 32639 32638 32641 32639 32636 32636 32633 32634 32633
32639 32634 32638 32631 32638 32638 32638 32637 32638 32639 32639 32635 32632 32636 32631
32634 32633 32632 32634 32629 32634 32638 32638 32638 32639 32637 32635 32633 32634 32635
32631 32632 32633 32634 32638 32638 32638 32638 32638 32640 32626 32636 32631 32633 32636
32639 32638 32637 32631 32628 32632 32638 32638 32637 32640 32638 32635 32633 32635 32631
32638 32638 32638 32633 32637 32640 32638 32638 32639 32639 32637 32636 32632 32634 32631
32634 32632 32631 32638 32629 32635 32638 32639 32637 32639 32638 32635 32633 32636 32629

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 32636 bytes 100%
1,000 32631 bytes -5 bytes 100%
10,000 32629 bytes -2 bytes 100%
100,000 32627 bytes -2 bytes 3.19%
1,000,000 32626 bytes -1 byte 1.45%
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
32728 bytes +102 bytes (+0.31%) +81 bytes
32728 bytes +102 bytes (+0.31%) +81 bytes
32653 bytes +27 bytes (+0.08%) +6 bytes
32663 bytes +37 bytes (+0.11%) +16 bytes
32647 bytes +21 bytes (+0.06%)
32677 bytes +51 bytes (+0.16%) +30 bytes
32726 bytes +100 bytes (+0.31%) +79 bytes
32749 bytes +123 bytes (+0.38%) +102 bytes
32773 bytes +147 bytes (+0.45%) +126 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 26700 bytes -5926 bytes (-18.16%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 27458 bytes -5168 bytes (-15.84%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 29150 bytes -3476 bytes (-10.65%)
Brotli (Wikipedia) brotli brotli -q 11 30422 bytes -2204 bytes (-6.76%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 30702 bytes -1924 bytes (-5.90%)
LZMA2 (Wikipedia) xz xz -9 31548 bytes -1078 bytes (-3.30%)
ZSTD (Wikipedia) zstd zstd -19 32173 bytes -453 bytes (-1.39%)

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 2017.
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