Choose a version:
34% The original file has 247597 bytes (241.8k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 84345 bytes (82.4k, 34%).

After GZIP compression these minified files vary in size:
Microsoft
  37757 bytes (36.9k)
CDN
Boot
  34440 bytes (33.6k)
CDN
jsdelivr
  34440 bytes (33.6k)
CDN
cdnjs
  29807 bytes (29.1k)
CDN
Baidu
  29793 bytes (29.1k)
CDN
unpkg
  29602 bytes (28.9k)
CDN
cdnhttps
  29593 bytes (28.9k)
CDN
gzip -6 (default)
  29589 bytes (28.9k)
local copy
Yandex
  29583 bytes (28.9k)
CDN
fastcdn
  29579 bytes (28.9k)
CDN
Google
  29556 bytes (28.9k)
CDN
gzip -9
  29539 bytes (28.8k)
local copy
7zip -mx=9 -tgzip
  28578 bytes (27.9k)
local copy
libdeflate -12
  28540 bytes (27.9k)
local copy
pigz -11 -n
  28525 bytes (27.9k)
local copy
kzip -s0 -rn -b2
  28502 bytes (27.8k)
local copy
Zopfli
  28490 bytes (27.8k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-2.1.4.min.js (or via HTTPS)

You will automatically get the smallest jQuery 2.1.4 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 1066 bytes by using my jQuery 2.1.4 Zopfli version instead of the best available CDN (3.74% smaller than Google, 28490 vs. 29556 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 --i10000000 --mb8 --mls2048 --bsr11 --lazy --ohh

(found September 6, 2015)
Description Value Parameter
iterations 10000000  --i10000000
maximum blocks 8  --mb8
maximum length score 2048  --mls2048
block splitting recursion 11  --bsr11
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-2.1.4.min.js --location | md5sum
f9c7afd05729f10f55b689f36bb20172  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-2.1.4.min.zopfli.js.gz | md5sum
f9c7afd05729f10f55b689f36bb20172  -

SHA1:
curl --silent --compressed https://code.jquery.com/jquery-2.1.4.min.js --location | sha1sum
43dc554608df885a59ddeece1598c6ace434d747  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-2.1.4.min.zopfli.js.gz | sha1sum
43dc554608df885a59ddeece1598c6ace434d747  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Yandex 29583 bytes f9c7afd05729f10f55b689f36bb20172 June 15, 2015 @ 21:17
fastcdn 29579 bytes f9c7afd05729f10f55b689f36bb20172 November 4, 2015 @ 10:10

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
Microsoft 37757 bytes 4a356126b9573eb7bd1e9a7494737410 > //# sourceMappingURL=jquery.min.map
April 28, 2015 @ 22:32
Boot 34440 bytes 4a356126b9573eb7bd1e9a7494737410 > //# sourceMappingURL=jquery.min.map
May 3, 2015 @ 00:37
jsdelivr 34440 bytes 4a356126b9573eb7bd1e9a7494737410 > //# sourceMappingURL=jquery.min.map
April 28, 2015 @ 18:40
cdnjs 29807 bytes 4a356126b9573eb7bd1e9a7494737410 > //# sourceMappingURL=jquery.min.map
May 1, 2015 @ 20:30
Baidu 29793 bytes b0dc11d0a434aafe88908c7f33d71095 only whitespaces differ June 3, 2015 @ 07:58
unpkg 29602 bytes 4a356126b9573eb7bd1e9a7494737410 > //# sourceMappingURL=jquery.min.map
July 11, 2016 @ 15:39
cdnhttps 29593 bytes 4a356126b9573eb7bd1e9a7494737410 only different sourceMappingURL December 24, 2015 @ 07:33
Google 29556 bytes 4a356126b9573eb7bd1e9a7494737410 only different sourceMappingURL April 30, 2015 @ 19:52

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

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
28490 bytes -2 bytes zopfli --i10000000 --mls2048 --bsr11 --lazy --ohh September 6, 2015 @ 01:42
28492 bytes -1 byte zopfli --i1000000 --mls2048 --bsr6 --lazy --ohh September 2, 2015 @ 20:43
28493 bytes -2 bytes zopfli --i1000000 --mls4096 --bsr6 --lazy --ohh September 2, 2015 @ 03:11
28495 bytes -3 bytes zopfli --i100000 --mls4096 --bsr6 --lazy --ohh September 1, 2015 @ 20:52
28498 bytes -1 byte zopfli --i1000 --mls4096 --bsr6 --lazy --ohh September 1, 2015 @ 20:31
28499 bytes zopfli --i100 --mls4096 --bsr11 --lazy --ohh September 1, 2015 @ 20:17

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, 1,000,000 or 10,000,000.
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
28513 28512 28513 28512 28513 28513 28511 28511 28509 28494 28496 28496 28494 28497 28516
28507 28501 28512 28513 28508 28499 28513 28502 28505 28494 28495 28495 28495 28494 28514
28509 28501 28507 28509 28510 28503 28502 28502 28505 28494 28492 28493 28498 28496 28507
28505 28504 28507 28507 28509 28507 28503 28509 28508 28495 28509 28496 28506 28494 28509
28503 28501 28510 28509 28503 28503 28514 28503 28509 28507 28492 28500 28493 28496 28507
28509 28501 28508 28504 28515 28507 28502 28502 28510 28510 28492 28495 28504 28496 28514
28509 28516 28512 28516 28517 28507 28502 28503 28511 28506 28492 28494 28505 28496 28515
28500 28505 28507 28509 28509 28500 28503 28509 28506 28506 28490 28495 28493 28496 28508
28500 28514 28508 28515 28516 28515 28502 28502 28506 28508 28494 28493 28504 28496 28508
28509 28502 28508 28509 28508 28508 28512 28502 28510 28507 28499 28500 28504 28496 28507
28503 28516 28508 28508 28509 28503 28503 28503 28506 28506 28500 28495 28495 28494 28510
28508 28505 28507 28508 28509 28503 28504 28503 28508 28494 28494 28495 28507 28505 28510
28509 28501 28507 28516 28513 28507 28502 28502 28505 28496 28492 28495 28493 28496 28509
28508 28501 28507 28504 28502 28507 28514 28503 28512 28508 28494 28495 28494 28496 28509
28514 28516 28514 28516 28502 28507 28502 28503 28508 28510 28494 28495 28494 28496 28510
28509 28501 28517 28504 28502 28507 28515 28502 28509 28497 28494 28495 28494 28494 28511
28509 28501 28508 28503 28508 28508 28503 28502 28511 28492 28494 28495 28494 28496 28507
28508 28501 28514 28508 28515 28508 28504 28502 28508 28496 28494 28495 28494 28496 28508
28514 28516 28514 28514 28507 28502 28503 28503 28508 28509 28494 28495 28507 28500 28510
28514 28516 28515 28512 28509 28508 28515 28503 28509 28494 28502 28495 28494 28496 28510
28515 28516 28515 28509 28503 28502 28503 28502 28508 28510 28494 28495 28505 28500 28507
28514 28501 28509 28516 28502 28507 28516 28502 28508 28510 28494 28495 28494 28500 28509
28514 28507 28515 28509 28502 28503 28515 28502 28513 28510 28502 28495 28506 28500 28507

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 28499 bytes 100%
1,000 28498 bytes -1 byte 100%
10,000 28494 bytes -4 bytes 100%
100,000 28493 bytes -1 byte 32.17%
1,000,000 28492 bytes -1 byte 3.48%
10,000,000 28490 bytes -2 bytes 0.29%

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
28595 bytes +105 bytes (+0.37%) +93 bytes
28595 bytes +105 bytes (+0.37%) +93 bytes
28502 bytes +12 bytes (+0.04%)
28515 bytes +25 bytes (+0.09%) +13 bytes
28530 bytes +40 bytes (+0.14%) +28 bytes
28561 bytes +71 bytes (+0.25%) +59 bytes
28599 bytes +109 bytes (+0.38%) +97 bytes
28638 bytes +148 bytes (+0.52%) +136 bytes
28674 bytes +184 bytes (+0.65%) +172 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 23668 bytes -4822 bytes (-16.93%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 24160 bytes -4330 bytes (-15.20%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 25459 bytes -3031 bytes (-10.64%)
Brotli (Wikipedia) brotli brotli -q 11 26620 bytes -1870 bytes (-6.56%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 26946 bytes -1544 bytes (-5.42%)
LZMA2 (Wikipedia) xz xz -9 27716 bytes -774 bytes (-2.72%)
Zstandard (Wikipedia) zstd zstd -19 28213 bytes -277 bytes (-0.97%)

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