Choose a version:
35% The original file has 242142 bytes (236.5k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 83612 bytes (81.7k, 35%).

After GZIP compression these minified files vary in size:
Microsoft
  37402 bytes (36.5k)
CDN, direct link
jsdelivr
  34066 bytes (33.3k)
CDN, direct link
Boot
  34063 bytes (33.3k)
CDN, direct link
Baidu
  29571 bytes (28.9k)
CDN, direct link
cdnjs
  29558 bytes (28.9k)
CDN, direct link
gzip -6 (default)
  29384 bytes (28.7k)
local copy
Google
  29361 bytes (28.7k)
CDN, direct link
cdnhttps
  29361 bytes (28.7k)
CDN, direct link
Sina
  29332 bytes (28.6k)
CDN, direct link
gzip -9
  29325 bytes (28.6k)
local copy
libdeflate -12
  28351 bytes (27.7k)
local copy
7zip -mx=9 -tgzip
  28348 bytes (27.7k)
local copy
Yandex
  28271 bytes (27.6k)
CDN, direct link
pigz -11 -n
  28269 bytes (27.6k)
local copy
kzip -s0 -rn -b2
  28261 bytes (27.6k)
local copy
Zopfli
  28248 bytes (27.6k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-2.0.3.min.js

You will automatically get the smallest jQuery 2.0.3 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 2.0.3 Zopfli version instead of the best available CDN (0.08% smaller than Yandex, 28248 vs. 28271 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 --bsr11 --lazy --ohh

(found September 2, 2015)
Description Value Parameter
iterations 1000000  --i1000000
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 http://code.jquery.com/jquery-2.0.3.min.js --location | md5sum
0a6e846b954e345951e710cd6ce3440e  -
curl --silent --compressed http://minime.stephan-brumme.com/files/jquery/jquery-2.0.3.min.zopfli.js.gz | md5sum
0a6e846b954e345951e710cd6ce3440e  -

SHA1:
curl --silent --compressed http://code.jquery.com/jquery-2.0.3.min.js --location | sha1sum
fbf9c77d0c4e3c34a485980c1e5316b6212160c8  -
curl --silent --compressed http://minime.stephan-brumme.com/files/jquery/jquery-2.0.3.min.zopfli.js.gz | sha1sum
fbf9c77d0c4e3c34a485980c1e5316b6212160c8  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Microsoft 37402 bytes 0a6e846b954e345951e710cd6ce3440e (invalid)
jsdelivr 34066 bytes 0a6e846b954e345951e710cd6ce3440e (invalid)
Sina 29332 bytes 0a6e846b954e345951e710cd6ce3440e (invalid)

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
Boot 34063 bytes ccd0edd113b78697e04fb5c1b519a5cd < //@ sourceMappingURL=jquery-2.0.3.min.map
> //@ sourceMappingURL=jquery.min.map
March 18, 2015 @ 09:43
Baidu 29571 bytes 5a104e61f58b01d7f465895e5e283127 < //@ sourceMappingURL=jquery-2.0.3.min.map
> //@ sourceMappingURL=jquery.min.map
January 7, 2015 @ 10:16
cdnjs 29558 bytes ccd0edd113b78697e04fb5c1b519a5cd < //@ sourceMappingURL=jquery-2.0.3.min.map
> //@ sourceMappingURL=jquery.min.map
(invalid)
Google 29361 bytes ccd0edd113b78697e04fb5c1b519a5cd < //@ sourceMappingURL=jquery-2.0.3.min.map
> //@ sourceMappingURL=jquery.min.map
(invalid)
cdnhttps 29361 bytes ccd0edd113b78697e04fb5c1b519a5cd only different sourceMappingURL December 24, 2015 @ 07:33
Yandex 28271 bytes ccd0edd113b78697e04fb5c1b519a5cd only different sourceMappingURL June 15, 2015 @ 21:17

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
28248 bytes -2 bytes zopfli --i1000000 --mls2048 --bsr11 --lazy --ohh September 2, 2015 @ 11:13
28250 bytes -2 bytes zopfli --i100000 --mls2048 --bsr11 --lazy --ohh September 1, 2015 @ 22:28
28252 bytes -4 bytes zopfli --i10000 --mls2048 --bsr11 --lazy --ohh September 1, 2015 @ 21:08
28256 bytes -2 bytes zopfli --i1000 --mls2048 --bsr11 --lazy --ohh September 1, 2015 @ 20:34
28258 bytes zopfli --i100 --mls2048 --bsr11 --lazy --ohh September 1, 2015 @ 20:18

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 @ 14:38.

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
28261 28261 28259 28259 28259 28262 28258 28258 28257 28253 28258 28259 28265 28269 28265
28255 28256 28256 28256 28255 28256 28257 28255 28255 28256 28254 28253 28258 28264 28262
28256 28256 28256 28257 28256 28254 28255 28258 28253 28255 28255 28252 28256 28263 28265
28261 28257 28255 28258 28255 28255 28256 28257 28259 28257 28258 28257 28259 28263 28264
28261 28254 28258 28258 28255 28258 28257 28257 28253 28254 28253 28254 28252 28255 28262
28262 28263 28263 28263 28255 28259 28255 28257 28254 28255 28253 28253 28261 28260 28265
28255 28257 28257 28259 28255 28259 28257 28258 28255 28254 28253 28260 28257 28262 28256
28257 28256 28256 28254 28258 28255 28257 28255 28254 28252 28248 28252 28258 28263 28254
28255 28258 28258 28257 28254 28253 28256 28257 28254 28256 28253 28256 28262 28254 28264
28262 28256 28259 28259 28255 28256 28257 28256 28253 28256 28255 28253 28255 28262 28265
28261 28254 28256 28255 28256 28253 28258 28248 28254 28254 28256 28252 28257 28263 28262
28257 28258 28263 28257 28258 28256 28259 28257 28256 28257 28254 28255 28260 28266 28264
28260 28255 28256 28263 28257 28255 28258 28257 28254 28256 28254 28252 28251 28262 28264
28255 28263 28258 28256 28255 28258 28258 28257 28256 28257 28254 28253 28260 28263 28262
28260 28258 28257 28264 28260 28255 28257 28257 28256 28257 28257 28253 28259 28266 28264
28257 28260 28264 28257 28258 28255 28255 28257 28257 28257 28256 28255 28263 28260 28262
28261 28263 28257 28262 28255 28253 28257 28257 28256 28261 28258 28260 28260 28256 28265
28261 28262 28262 28257 28255 28259 28257 28256 28256 28257 28255 28259 28261 28262 28265
28259 28255 28257 28262 28259 28255 28258 28250 28256 28258 28258 28253 28260 28262 28264
28257 28257 28254 28259 28255 28256 28258 28257 28256 28256 28256 28253 28262 28263 28264
28259 28257 28264 28259 28254 28259 28256 28257 28256 28259 28259 28255 28259 28263 28264
28255 28263 28256 28256 28255 28259 28256 28257 28256 28258 28257 28257 28264 28263 28262
28255 28264 28263 28256 28258 28255 28257 28250 28256 28256 28261 28254 28254 28256 28264

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 28257 bytes 100%
1,000 28254 bytes -3 bytes 100%
10,000 28251 bytes -3 bytes 100%
100,000 28248 bytes -3 bytes 16.81%
1,000,000 28248 bytes 0.29%
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
28339 bytes +91 bytes (+0.32%) +78 bytes
28341 bytes +93 bytes (+0.33%) +80 bytes
28261 bytes +13 bytes (+0.05%)
28261 bytes +13 bytes (+0.05%)
28271 bytes +23 bytes (+0.08%) +10 bytes
28301 bytes +53 bytes (+0.19%) +40 bytes
28348 bytes +100 bytes (+0.35%) +87 bytes
28380 bytes +132 bytes (+0.47%) +119 bytes
28401 bytes +153 bytes (+0.54%) +140 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 23451 bytes -4797 bytes (-16.98%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 23942 bytes -4306 bytes (-15.24%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 25134 bytes -3114 bytes (-11.02%)
Brotli (Wikipedia) brotli brotli -q 11 26450 bytes -1798 bytes (-6.37%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 26754 bytes -1494 bytes (-5.29%)
LZMA2 (Wikipedia) xz xz -9 27528 bytes -720 bytes (-2.55%)
ZSTD (Wikipedia) zstd zstd -19 27968 bytes -280 bytes (-0.99%)

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