Choose a version:
34% The original file has 247380 bytes (241.6k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 84318 bytes (82.3k, 34%).

After GZIP compression these minified files vary in size:
Microsoft
  37723 bytes (36.8k)
CDN
Boot
  34460 bytes (33.7k)
CDN
cdnjs
  29798 bytes (29.1k)
CDN
Baidu
  29778 bytes (29.1k)
CDN
unpkg
  29606 bytes (28.9k)
CDN
cdnhttps
  29586 bytes (28.9k)
CDN
gzip -6 (default)
  29581 bytes (28.9k)
local copy
gzip -9
  29526 bytes (28.8k)
local copy
7zip -mx=9 -tgzip
  28581 bytes (27.9k)
local copy
libdeflate -12
  28536 bytes (27.9k)
local copy
pigz -11 -n
  28519 bytes (27.9k)
local copy
kzip -s0 -rn -b2
  28498 bytes (27.8k)
local copy
Zopfli
  28487 bytes (27.8k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-2.1.2.min.js

You will automatically get the smallest jQuery 2.1.2 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 1099 bytes by using my jQuery 2.1.2 Zopfli version instead of the best available CDN (3.86% smaller than cdnhttps, 28487 vs. 29586 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 --mls4096 --bsr9 --lazy --ohh

(found September 2, 2015)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 4096  --mls4096
block splitting recursion 9  --bsr9
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-2.1.2.min.js --location | md5sum
1fcc34cc14f943523a767703dc88869c  -
curl --silent --compressed http://minime.stephan-brumme.com/files/jquery/jquery-2.1.2.min.zopfli.js.gz | md5sum
1fcc34cc14f943523a767703dc88869c  -

SHA1:
curl --silent --compressed http://code.jquery.com/jquery-2.1.2.min.js --location | sha1sum
58b3dd95d9083bd4f4a9d7da3b6bb67e761ba8a3  -
curl --silent --compressed http://minime.stephan-brumme.com/files/jquery/jquery-2.1.2.min.zopfli.js.gz | sha1sum
58b3dd95d9083bd4f4a9d7da3b6bb67e761ba8a3  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Microsoft 37723 bytes 1fcc34cc14f943523a767703dc88869c December 31, 2014 @ 19:15

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
Boot 34460 bytes e92dc670d4f3b73fd3dfd863536ca80c > //# sourceMappingURL=jquery.min.map
March 18, 2015 @ 09:44
cdnjs 29798 bytes e92dc670d4f3b73fd3dfd863536ca80c > //# sourceMappingURL=jquery.min.map
December 17, 2014 @ 17:45
Baidu 29778 bytes ba9dc77776daf882e2ddf3db2d2de08c only whitespaces differ July 3, 2015 @ 09:27
unpkg 29606 bytes e92dc670d4f3b73fd3dfd863536ca80c > //# sourceMappingURL=jquery.min.map
July 11, 2016 @ 15:39
cdnhttps 29586 bytes e92dc670d4f3b73fd3dfd863536ca80c only different sourceMappingURL 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
28487 bytes -2 bytes zopfli --i1000000 --mls4096 --bsr9 --lazy --ohh September 2, 2015 @ 07:32
28489 bytes -1 byte zopfli --i100000 --mls4096 --bsr9 --lazy --ohh September 1, 2015 @ 22:04
28490 bytes -2 bytes zopfli --i100000 --mls4096 --bsr6 --lazy --ohh September 1, 2015 @ 21:59
28492 bytes -1 byte zopfli --i1000 --mls4096 --bsr16 --lazy --ohh September 1, 2015 @ 20:33
28493 bytes zopfli --i100 --mls4096 --bsr12 --lazy --ohh September 1, 2015 @ 20:21

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

Most recent activity on July 11, 2016 @ 15:39.

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
28506 28506 28505 28506 28506 28506 28504 28506 28503 28488 28489 28488 28490 28494 28505
28508 28509 28510 28509 28511 28504 28506 28497 28499 28490 28489 28489 28502 28492 28509
28501 28496 28501 28501 28499 28510 28507 28497 28503 28489 28497 28490 28490 28492 28503
28502 28496 28505 28503 28506 28498 28498 28503 28504 28503 28491 28492 28502 28491 28501
28503 28497 28498 28498 28508 28510 28497 28499 28501 28488 28488 28490 28497 28491 28502
28500 28498 28508 28499 28508 28497 28507 28498 28500 28501 28500 28487 28498 28492 28503
28496 28508 28510 28510 28509 28501 28497 28498 28500 28499 28488 28489 28498 28491 28501
28503 28504 28505 28500 28508 28501 28497 28501 28500 28501 28487 28489 28490 28492 28502
28503 28497 28507 28508 28510 28510 28499 28497 28500 28500 28499 28489 28498 28492 28503
28501 28500 28499 28501 28501 28498 28501 28497 28500 28501 28495 28489 28498 28492 28503
28501 28499 28507 28498 28503 28509 28509 28499 28499 28498 28499 28489 28496 28492 28503
28501 28509 28507 28501 28502 28497 28497 28497 28504 28502 28488 28492 28501 28492 28503
28501 28498 28502 28510 28502 28499 28509 28497 28500 28500 28500 28489 28497 28492 28503
28503 28499 28501 28500 28502 28508 28510 28498 28507 28502 28487 28491 28506 28492 28502
28503 28498 28507 28510 28502 28509 28497 28497 28502 28501 28487 28491 28498 28492 28503
28496 28498 28508 28504 28502 28509 28498 28497 28504 28492 28487 28492 28499 28491 28501
28502 28497 28507 28503 28501 28496 28498 28497 28503 28492 28491 28491 28500 28491 28503
28501 28499 28508 28507 28501 28498 28497 28496 28504 28504 28488 28491 28501 28492 28501
28501 28509 28506 28502 28502 28509 28498 28497 28503 28503 28499 28491 28499 28492 28502
28501 28508 28508 28507 28508 28508 28509 28499 28502 28491 28499 28492 28501 28492 28503
28503 28508 28507 28504 28501 28509 28497 28498 28504 28503 28487 28491 28501 28492 28504
28496 28497 28507 28510 28502 28508 28509 28497 28504 28502 28491 28491 28499 28492 28503
28501 28509 28502 28501 28500 28509 28509 28497 28503 28503 28498 28492 28500 28492 28504

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 28492 bytes 100%
1,000 28491 bytes -1 byte 100%
10,000 28490 bytes -1 byte 100%
100,000 28487 bytes -3 bytes 17.68%
1,000,000 28487 bytes 0.58%
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
28588 bytes +101 bytes (+0.35%) +90 bytes
28589 bytes +102 bytes (+0.36%) +91 bytes
28498 bytes +11 bytes (+0.04%)
28510 bytes +23 bytes (+0.08%) +12 bytes
28520 bytes +33 bytes (+0.12%) +22 bytes
28560 bytes +73 bytes (+0.26%) +62 bytes
28599 bytes +112 bytes (+0.39%) +101 bytes
28633 bytes +146 bytes (+0.51%) +135 bytes
28671 bytes +184 bytes (+0.65%) +173 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 23662 bytes -4825 bytes (-16.94%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 24152 bytes -4335 bytes (-15.22%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 25450 bytes -3037 bytes (-10.66%)
Brotli (Wikipedia) brotli brotli -q 11 26654 bytes -1833 bytes (-6.43%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 26936 bytes -1551 bytes (-5.44%)
LZMA2 (Wikipedia) xz xz -9 27716 bytes -771 bytes (-2.71%)
ZSTD (Wikipedia) zstd zstd -19 28214 bytes -273 bytes (-0.96%)

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