Choose a version:
35% The original file has 240196 bytes (234.6k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 83095 bytes (81.1k, 35%).

After GZIP compression these minified files vary in size:
Microsoft
  37041 bytes (36.2k)
CDN
Boot
  33839 bytes (33.0k)
CDN
jsdelivr
  33839 bytes (33.0k)
CDN
Baidu
  29316 bytes (28.6k)
CDN
cdnjs
  29306 bytes (28.6k)
CDN
gzip -6 (default)
  29143 bytes (28.5k)
local copy
Google
  29123 bytes (28.4k)
CDN
cdnhttps
  29123 bytes (28.4k)
CDN
gzip -9
  29075 bytes (28.4k)
local copy
7zip -mx=9 -tgzip
  28134 bytes (27.5k)
local copy
libdeflate -12
  28085 bytes (27.4k)
local copy
Yandex
  28070 bytes (27.4k)
CDN
pigz -11 -n
  28063 bytes (27.4k)
local copy
kzip -s0 -rn -b2
  28047 bytes (27.4k)
local copy
Zopfli
  28042 bytes (27.4k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-2.0.0.min.js (or via HTTPS)

You will automatically get the smallest jQuery 2.0.0 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 28 bytes by using my jQuery 2.0.0 Zopfli version instead of the best available CDN (0.10% smaller than Yandex, 28042 vs. 28070 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 --mls32768 --bsr13 --lazy --ohh

(found November 23, 2015)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 32768  --mls32768
block splitting recursion 13  --bsr13
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-2.0.0.min.js --location | md5sum
2edc942c0bd2476be8967a9f788d9e26  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-2.0.0.min.zopfli.js.gz | md5sum
2edc942c0bd2476be8967a9f788d9e26  -

SHA1:
curl --silent --compressed https://code.jquery.com/jquery-2.0.0.min.js --location | sha1sum
0be05c714a7e6cf28fe692629ece5b3769901dca  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-2.0.0.min.zopfli.js.gz | sha1sum
0be05c714a7e6cf28fe692629ece5b3769901dca  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Microsoft 37041 bytes 2edc942c0bd2476be8967a9f788d9e26 (invalid)
Boot 33839 bytes 2edc942c0bd2476be8967a9f788d9e26 March 18, 2015 @ 09:43
jsdelivr 33839 bytes 2edc942c0bd2476be8967a9f788d9e26 (invalid)
cdnjs 29306 bytes 2edc942c0bd2476be8967a9f788d9e26 (invalid)
Google 29123 bytes 2edc942c0bd2476be8967a9f788d9e26 (invalid)
cdnhttps 29123 bytes 2edc942c0bd2476be8967a9f788d9e26 December 24, 2015 @ 07:33
Yandex 28070 bytes 2edc942c0bd2476be8967a9f788d9e26 June 15, 2015 @ 21:17

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
Baidu 29316 bytes b327509226baa10f2d2e89c42c2c49fb only whitespaces differ January 7, 2015 @ 10:16

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
28042 bytes -1 byte zopfli --i100000 --mls32768 --bsr13 --lazy --ohh November 23, 2015 @ 14:25
28043 bytes -3 bytes zopfli --i100000 --mls512 --bsr9 --lazy --ohh September 6, 2015 @ 06:47
28046 bytes -2 bytes zopfli --i100000 --mls1024 --bsr12 --lazy --ohh September 1, 2015 @ 23:33
28048 bytes -1 byte zopfli --i10000 --mls1024 --bsr12 --lazy --ohh September 1, 2015 @ 21:00
28049 bytes -1 byte zopfli --i1000 --mls1024 --bsr12 --lazy --ohh September 1, 2015 @ 20:35
28050 bytes -1 byte zopfli --i1000 --mls512 --bsr14 --lazy --ohh September 1, 2015 @ 20:35
28051 bytes zopfli --i100 --mls8192 --bsr8 --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 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
28052 28046 28047 28048 28054 28050 28053 28052 28046 28044 28045 28045 28046 28053 28055
28048 28048 28055 28051 28051 28050 28056 28049 28043 28045 28047 28053 28051 28047 28050
28051 28051 28051 28056 28049 28049 28054 28051 28052 28048 28045 28047 28046 28045 28047
28048 28055 28056 28049 28054 28049 28049 28051 28048 28049 28050 28053 28051 28049 28052
28048 28054 28051 28058 28052 28047 28048 28049 28043 28045 28046 28050 28044 28049 28057
28048 28052 28057 28054 28058 28049 28053 28048 28043 28045 28048 28047 28045 28050 28054
28047 28049 28050 28060 28051 28049 28048 28051 28043 28045 28046 28049 28047 28048 28046
28048 28054 28053 28055 28056 28049 28049 28048 28043 28046 28045 28047 28047 28047 28052
28047 28054 28050 28055 28054 28048 28054 28048 28046 28046 28044 28050 28047 28046 28051
28047 28050 28047 28056 28049 28049 28049 28048 28046 28043 28043 28050 28044 28046 28042
28048 28052 28054 28049 28056 28048 28045 28048 28046 28046 28044 28049 28048 28046 28052
28048 28054 28056 28055 28050 28053 28054 28049 28045 28048 28046 28053 28050 28047 28052
28055 28054 28055 28059 28054 28051 28049 28048 28046 28046 28048 28050 28047 28046 28056
28048 28050 28050 28058 28049 28049 28049 28048 28048 28048 28046 28052 28050 28047 28056
28048 28053 28051 28052 28055 28052 28053 28048 28048 28048 28053 28052 28050 28046 28056
28049 28052 28049 28056 28059 28051 28050 28045 28046 28048 28047 28052 28050 28049 28050
28048 28056 28054 28058 28055 28047 28055 28047 28048 28047 28048 28054 28050 28046 28055
28047 28051 28047 28055 28056 28054 28048 28048 28048 28048 28046 28053 28050 28047 28049
28055 28056 28055 28054 28052 28053 28050 28048 28048 28050 28047 28053 28048 28047 28052
28057 28048 28050 28059 28051 28049 28052 28048 28048 28050 28047 28053 28051 28045 28057
28048 28050 28051 28058 28055 28048 28045 28048 28048 28048 28046 28052 28051 28049 28054
28048 28048 28053 28054 28055 28053 28053 28048 28048 28050 28047 28053 28053 28047 28053
28048 28054 28054 28055 28054 28048 28049 28048 28045 28048 28053 28053 28054 28048 28058

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 28049 bytes 100%
1,000 28045 bytes -4 bytes 100%
10,000 28044 bytes -1 byte 100%
100,000 28042 bytes -2 bytes 16.23%
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
28127 bytes +85 bytes (+0.30%) +80 bytes
28127 bytes +85 bytes (+0.30%) +80 bytes
28047 bytes +5 bytes (+0.02%)
28056 bytes +14 bytes (+0.05%) +9 bytes
28072 bytes +30 bytes (+0.11%) +25 bytes
28094 bytes +52 bytes (+0.19%) +47 bytes
28132 bytes +90 bytes (+0.32%) +85 bytes
28171 bytes +129 bytes (+0.46%) +124 bytes
28194 bytes +152 bytes (+0.54%) +147 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 23299 bytes -4743 bytes (-16.91%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 23779 bytes -4263 bytes (-15.20%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 25000 bytes -3042 bytes (-10.85%)
Brotli (Wikipedia) brotli brotli -q 11 26272 bytes -1770 bytes (-6.31%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 26604 bytes -1438 bytes (-5.13%)
LZMA2 (Wikipedia) xz xz -9 27328 bytes -714 bytes (-2.55%)
Zstandard (Wikipedia) zstd zstd -19 27768 bytes -274 bytes (-0.98%)

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