Choose a version:
34% The original file has 282944 bytes (276.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 96381 bytes (94.1k, 34%).

After GZIP compression these minified files vary in size:
Microsoft
  42837 bytes (41.8k)
CDN
Boot
  39019 bytes (38.1k)
CDN
jsdelivr
  39019 bytes (38.1k)
CDN
cdnjs
  33634 bytes (32.8k)
CDN
unpkg
  33460 bytes (32.7k)
CDN
gzip -6 (default)
  33438 bytes (32.7k)
local copy
cdnhttps
  33417 bytes (32.6k)
CDN
gzip -9
  33378 bytes (32.6k)
local copy
Google
  33369 bytes (32.6k)
CDN
7zip -mx=9 -tgzip
  32306 bytes (31.5k)
local copy
libdeflate -12
  32286 bytes (31.5k)
local copy
Yandex
  32243 bytes (31.5k)
CDN
kzip -s0 -rn -b2
  32236 bytes (31.5k)
local copy
pigz -11 -n
  32230 bytes (31.5k)
local copy
Zopfli
  32210 bytes (31.5k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-1.11.0.min.js (or via HTTPS)

You will automatically get the smallest jQuery 1.11.0 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 33 bytes by using my jQuery 1.11.0 Zopfli version instead of the best available CDN (0.10% smaller than Yandex, 32210 vs. 32243 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 --mls8192 --bsr12 --lazy --ohh

(found October 21, 2015)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 8192  --mls8192
block splitting recursion 12  --bsr12
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-1.11.0.min.js --location | md5sum
8fc25e27d42774aeae6edbc0a18b72aa  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.11.0.min.zopfli.js.gz | md5sum
8fc25e27d42774aeae6edbc0a18b72aa  -

SHA1:
curl --silent --compressed http://code.jquery.com/jquery-1.11.0.min.js --location | sha1sum
b66ed708717bf0b4a005a4d0113af8843ef3b8ff  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.11.0.min.zopfli.js.gz | sha1sum
b66ed708717bf0b4a005a4d0113af8843ef3b8ff  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Microsoft 42837 bytes 8fc25e27d42774aeae6edbc0a18b72aa (invalid)
Boot 39019 bytes 8fc25e27d42774aeae6edbc0a18b72aa March 18, 2015 @ 09:40
jsdelivr 39019 bytes 8fc25e27d42774aeae6edbc0a18b72aa (invalid)
cdnjs 33634 bytes 8fc25e27d42774aeae6edbc0a18b72aa (invalid)
cdnhttps 33417 bytes 8fc25e27d42774aeae6edbc0a18b72aa December 24, 2015 @ 07:33
Google 33369 bytes 8fc25e27d42774aeae6edbc0a18b72aa (invalid)
Yandex 32243 bytes 8fc25e27d42774aeae6edbc0a18b72aa June 15, 2015 @ 21:17

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
unpkg 33460 bytes 5506e81cd13183312c8cf5425c9f8c5e > //# sourceMappingURL=jquery.min.map
July 11, 2016 @ 15:40

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
32210 bytes -2 bytes zopfli --i100000 --mls8192 --bsr12 --lazy --ohh October 21, 2015 @ 12:32
32212 bytes -1 byte zopfli --i10000 --mls8192 --bsr11 --lazy --ohh September 4, 2015 @ 10:18
32213 bytes -3 bytes zopfli --i100000 --mls4096 --bsr4 --lazy --ohh September 2, 2015 @ 03:02
32216 bytes -2 bytes zopfli --i10000 --mls4096 --bsr4 --lazy --ohh September 1, 2015 @ 21:32
32218 bytes -2 bytes zopfli --i1000 --mls4096 --bsr4 --lazy --ohh September 1, 2015 @ 20:41
32220 bytes zopfli --i100 --mls4096 --bsr4 --lazy --ohh September 1, 2015 @ 20:16

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 @ 15:40.

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
32233 32235 32226 32234 32221 32220 32219 32222 32222 32224 32222 32224 32224 32227 32224
32220 32223 32219 32230 32220 32220 32219 32223 32216 32216 32217 32213 32218 32217 32224
32222 32221 32218 32223 32226 32222 32223 32232 32219 32219 32223 32216 32214 32215 32220
32223 32220 32218 32221 32220 32220 32221 32216 32217 32220 32220 32214 32213 32216 32223
32225 32223 32219 32220 32222 32220 32219 32222 32222 32224 32223 32213 32214 32215 32220
32223 32221 32219 32230 32223 32223 32216 32225 32217 32220 32223 32216 32214 32215 32226
32221 32222 32216 32222 32222 32222 32218 32222 32221 32220 32219 32216 32217 32215 32225
32224 32222 32218 32221 32220 32223 32223 32221 32220 32219 32222 32215 32212 32215 32220
32222 32223 32219 32220 32222 32221 32224 32219 32217 32218 32221 32216 32210 32216 32217
32224 32220 32219 32221 32221 32222 32224 32225 32220 32219 32218 32215 32218 32216 32224
32223 32221 32218 32222 32220 32222 32220 32225 32217 32218 32223 32213 32214 32216 32219
32225 32222 32219 32221 32222 32221 32224 32225 32218 32220 32220 32213 32210 32215 32223
32224 32223 32222 32220 32220 32223 32221 32220 32218 32220 32222 32215 32213 32215 32224
32230 32222 32220 32221 32222 32223 32219 32223 32217 32224 32222 32215 32212 32215 32220
32224 32222 32219 32222 32220 32219 32224 32222 32218 32219 32223 32216 32220 32215 32218
32220 32220 32234 32221 32222 32221 32223 32220 32217 32219 32218 32216 32220 32216 32222
32223 32223 32219 32221 32227 32222 32223 32225 32217 32220 32222 32213 32219 32216 32223
32221 32222 32219 32221 32222 32224 32225 32222 32217 32220 32219 32215 32217 32216 32225
32231 32229 32220 32221 32228 32221 32223 32222 32220 32219 32220 32216 32212 32216 32222
32230 32222 32227 32229 32223 32221 32224 32222 32220 32219 32220 32213 32212 32216 32222
32227 32221 32221 32219 32221 32221 32222 32225 32220 32220 32223 32216 32220 32215 32219
32226 32222 32220 32221 32227 32222 32224 32221 32217 32219 32219 32216 32212 32216 32220
32224 32222 32220 32221 32222 32220 32221 32225 32217 32219 32220 32222 32221 32215 32218

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 32220 bytes 100%
1,000 32214 bytes -6 bytes 100%
10,000 32212 bytes -2 bytes 100%
100,000 32210 bytes -2 bytes 1.16%
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
32308 bytes +98 bytes (+0.30%) +72 bytes
32305 bytes +95 bytes (+0.29%) +69 bytes
32236 bytes +26 bytes (+0.08%)
32250 bytes +40 bytes (+0.12%) +14 bytes
32292 bytes +82 bytes (+0.25%) +56 bytes
32313 bytes +103 bytes (+0.32%) +77 bytes
32351 bytes +141 bytes (+0.44%) +115 bytes
32362 bytes +152 bytes (+0.47%) +126 bytes
32380 bytes +170 bytes (+0.53%) +144 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 26337 bytes -5873 bytes (-18.23%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 27044 bytes -5166 bytes (-16.04%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 28767 bytes -3443 bytes (-10.69%)
Brotli (Wikipedia) brotli brotli -q 11 30009 bytes -2201 bytes (-6.83%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 30269 bytes -1941 bytes (-6.03%)
LZMA2 (Wikipedia) xz xz -9 31112 bytes -1098 bytes (-3.41%)
Zstandard (Wikipedia) zstd zstd -19 31739 bytes -471 bytes (-1.46%)

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