Choose a version:
33% The original file has 293840 bytes (287.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 97244 bytes (95.0k, 33%).

After GZIP compression these minified files vary in size:
Microsoft
  43394 bytes (42.4k)
CDN
Boot
  39476 bytes (38.6k)
CDN
cdnhttps
  38093 bytes (37.2k)
CDN
cdnjs
  34047 bytes (33.2k)
CDN
gzip -6 (default)
  33863 bytes (33.1k)
local copy
unpkg
  33837 bytes (33.0k)
CDN
gzip -9
  33810 bytes (33.0k)
local copy
Google
  33809 bytes (33.0k)
CDN
7zip -mx=9 -tgzip
  32691 bytes (31.9k)
local copy
libdeflate -12
  32672 bytes (31.9k)
local copy
Yandex
  32619 bytes (31.9k)
CDN
pigz -11 -n
  32611 bytes (31.8k)
local copy
kzip -s0 -rn -b2
  32599 bytes (31.8k)
local copy
Zopfli
  32590 bytes (31.8k)
local copy
Zopfli (defluff)
  32589 bytes (31.8k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-1.12.2.min.js (or via HTTPS)

You will automatically get the smallest jQuery 1.12.2 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 29 bytes by using my jQuery 1.12.2 Zopfli version instead of the best available CDN (0.09% smaller than Yandex, 32590 vs. 32619 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 --bsr12 --lazy --ohh

(found March 19, 2016)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 2048  --mls2048
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

Even Smaller Files Thanks To Defluff

Zopfli's output can be further optimized by the defluff tool.
In this particular case, defluff saves 1 more byte (32589 bytes).

Verify file integrity

After decompression, my uncompressed files are identical to the original ones:

MD5:
curl --silent --compressed https://code.jquery.com/jquery-1.12.2.min.js --location | md5sum
bdc2b7efb1faf219d65edfe253a103e9  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.12.2.min.zopfli.js.gz | md5sum
bdc2b7efb1faf219d65edfe253a103e9  -

SHA1:
curl --silent --compressed https://code.jquery.com/jquery-1.12.2.min.js --location | sha1sum
4921529fc15b8133f2fe65b3bebf53d1e9ef8579  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.12.2.min.zopfli.js.gz | sha1sum
4921529fc15b8133f2fe65b3bebf53d1e9ef8579  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Microsoft 43394 bytes bdc2b7efb1faf219d65edfe253a103e9 March 28, 2016 @ 21:41
Boot 39476 bytes bdc2b7efb1faf219d65edfe253a103e9 May 4, 2016 @ 09:17
cdnhttps 38093 bytes bdc2b7efb1faf219d65edfe253a103e9 November 22, 2016 @ 16:35
cdnjs 34047 bytes bdc2b7efb1faf219d65edfe253a103e9 March 18, 2016 @ 08:31
unpkg 33837 bytes bdc2b7efb1faf219d65edfe253a103e9 July 11, 2016 @ 15:39
Google 33809 bytes bdc2b7efb1faf219d65edfe253a103e9 March 18, 2016 @ 22:26
Yandex 32619 bytes bdc2b7efb1faf219d65edfe253a103e9 (invalid)

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
32590 bytes -1 byte zopfli --i1000000 --mls2048 --bsr12 --lazy --ohh March 19, 2016 @ 18:58
32591 bytes -2 bytes zopfli --i100000 --mls2048 --bsr25 --lazy --ohh March 19, 2016 @ 02:52
32593 bytes -1 byte zopfli --i100000 --mls32768 --bsr16 --lazy --ohh March 19, 2016 @ 02:18
32594 bytes -1 byte zopfli --i10000 --mls32 --bsr23 --lazy --ohh March 18, 2016 @ 13:28
32595 bytes -1 byte zopfli --i1000 --mls8192 --bsr6 --lazy --ohh March 18, 2016 @ 12:33
32596 bytes -1 byte zopfli --i1000 --mls2048 --bsr20 --lazy --ohh March 18, 2016 @ 12:04
32597 bytes -1 byte zopfli --i1000 --mls4 --bsr15 --lazy --ohh March 18, 2016 @ 12:03
32598 bytes -4 bytes zopfli --i1000 --mls8192 --bsr18 --lazy --ohh March 18, 2016 @ 11:58
32602 bytes zopfli --i100 --mls16 --bsr21 --lazy --ohh March 18, 2016 @ 11:49

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

Most recent activity on November 22, 2016 @ 16:35.

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
32604 32604 32604 32605 32604 32603 32602 32606 32606 32607 32606 32606 32612 32611 32607
32599 32598 32600 32600 32597 32599 32598 32601 32600 32601 32598 32596 32609 32600 32599
32604 32603 32603 32597 32602 32599 32597 32602 32603 32604 32599 32599 32595 32599 32593
32605 32593 32596 32598 32593 32599 32602 32598 32599 32600 32591 32599 32599 32597 32597
32604 32596 32604 32597 32597 32603 32603 32606 32606 32607 32592 32599 32596 32599 32592
32597 32603 32596 32596 32598 32599 32597 32604 32599 32603 32596 32598 32596 32599 32592
32593 32592 32598 32596 32602 32598 32602 32602 32593 32603 32591 32598 32593 32599 32597
32600 32598 32598 32592 32592 32603 32603 32602 32603 32603 32591 32598 32596 32601 32593
32604 32603 32603 32597 32602 32603 32603 32599 32595 32603 32590 32599 32598 32599 32598
32594 32596 32602 32596 32603 32599 32597 32602 32603 32603 32599 32599 32597 32597 32592
32596 32596 32602 32596 32596 32598 32597 32601 32600 32604 32596 32599 32597 32597 32597
32594 32595 32598 32597 32592 32600 32602 32597 32600 32600 32592 32600 32597 32597 32593
32598 32602 32597 32596 32592 32603 32603 32597 32597 32604 32593 32599 32597 32599 32593
32594 32596 32596 32596 32596 32602 32604 32602 32599 32602 32590 32598 32596 32597 32598
32594 32596 32596 32596 32596 32603 32602 32598 32598 32603 32592 32598 32597 32599 32592
32596 32594 32596 32596 32597 32602 32602 32598 32603 32603 32591 32599 32597 32599 32597
32602 32595 32599 32597 32603 32600 32595 32598 32599 32603 32596 32600 32598 32599 32593
32604 32598 32602 32592 32596 32600 32601 32599 32598 32603 32591 32598 32598 32599 32597
32596 32596 32597 32593 32592 32602 32599 32597 32597 32603 32596 32599 32597 32598 32597
32596 32593 32596 32596 32591 32595 32597 32599 32600 32603 32593 32599 32597 32598 32601
32605 32594 32596 32596 32590 32601 32603 32598 32597 32602 32591 32599 32598 32597 32592
32605 32594 32597 32597 32590 32599 32595 32598 32597 32603 32591 32600 32597 32599 32597
32594 32596 32597 32597 32592 32600 32597 32598 32598 32604 32591 32599 32599 32599 32596

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 32602 bytes 100%
1,000 32595 bytes -7 bytes 100%
10,000 32594 bytes -1 byte 100%
100,000 32591 bytes -3 bytes 16.81%
1,000,000 32590 bytes -1 byte 3.77%
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
32696 bytes +106 bytes (+0.33%) +97 bytes
32696 bytes +106 bytes (+0.33%) +97 bytes
32599 bytes +9 bytes (+0.03%)
32612 bytes +22 bytes (+0.07%) +13 bytes
32622 bytes +32 bytes (+0.10%) +23 bytes
32653 bytes +63 bytes (+0.19%) +54 bytes
32687 bytes +97 bytes (+0.30%) +88 bytes
32724 bytes +134 bytes (+0.41%) +125 bytes
32768 bytes +178 bytes (+0.55%) +169 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 26661 bytes -5929 bytes (-18.19%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 27413 bytes -5177 bytes (-15.89%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 29114 bytes -3476 bytes (-10.67%)
Brotli (Wikipedia) brotli brotli -q 11 30427 bytes -2163 bytes (-6.64%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 30667 bytes -1923 bytes (-5.90%)
LZMA2 (Wikipedia) xz xz -9 31532 bytes -1058 bytes (-3.25%)
Zstandard (Wikipedia) zstd zstd -19 32134 bytes -456 bytes (-1.40%)

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