Choose a version:
34% The original file has 273810 bytes (267.4k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 93026 bytes (90.8k, 34%).

After GZIP compression these minified files vary in size:
Microsoft
  41670 bytes (40.7k)
CDN
jsdelivr
  38109 bytes (37.2k)
CDN
Boot
  38105 bytes (37.2k)
CDN
cdnjs
  33963 bytes (33.2k)
CDN
Baidu
  33111 bytes (32.3k)
CDN
gzip -6 (default)
  32865 bytes (32.1k)
local copy
Google
  32841 bytes (32.1k)
CDN
cdnhttps
  32841 bytes (32.1k)
CDN
gzip -9
  32831 bytes (32.1k)
local copy
libdeflate -12
  31768 bytes (31.0k)
local copy
7zip -mx=9 -tgzip
  31758 bytes (31.0k)
local copy
Yandex
  31688 bytes (30.9k)
CDN
pigz -11 -n
  31685 bytes (30.9k)
local copy
kzip -s0 -rn -b2
  31684 bytes (30.9k)
local copy
Zopfli
  31662 bytes (30.9k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-1.10.0.min.js

You will automatically get the smallest jQuery 1.10.0 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 26 bytes by using my jQuery 1.10.0 Zopfli version instead of the best available CDN (0.08% smaller than Yandex, 31662 vs. 31688 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 --mls32 --bsr8 --lazy --ohh

(found January 8, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 32  --mls32
block splitting recursion 8  --bsr8
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-1.10.0.min.js --location | md5sum
00ff34b67a328f219fa3ae2423d4f252  -
curl --silent --compressed http://minime.stephan-brumme.com/files/jquery/jquery-1.10.0.min.zopfli.js.gz | md5sum
00ff34b67a328f219fa3ae2423d4f252  -

SHA1:
curl --silent --compressed http://code.jquery.com/jquery-1.10.0.min.js --location | sha1sum
19715ffee604b54e95a0e9db76f6de2b5125c29e  -
curl --silent --compressed http://minime.stephan-brumme.com/files/jquery/jquery-1.10.0.min.zopfli.js.gz | sha1sum
19715ffee604b54e95a0e9db76f6de2b5125c29e  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Microsoft 41670 bytes 00ff34b67a328f219fa3ae2423d4f252 (invalid)
jsdelivr 38109 bytes 00ff34b67a328f219fa3ae2423d4f252 (invalid)
Yandex 31688 bytes 00ff34b67a328f219fa3ae2423d4f252 June 15, 2015 @ 21:17

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
Boot 38105 bytes 9af32b0c4370614a502342d27e9c8954 < //@ sourceMappingURL=jquery-1.10.0.min.map
> //@ sourceMappingURL=jquery.min.map
March 18, 2015 @ 09:39
cdnjs 33963 bytes 9af32b0c4370614a502342d27e9c8954 < //@ sourceMappingURL=jquery-1.10.0.min.map
> //@ sourceMappingURL=jquery.min.map
(invalid)
Baidu 33111 bytes aa7426af0bf2d802ab3a5f94e6ce2afb < //@ sourceMappingURL=jquery-1.10.0.min.map
> //@ sourceMappingURL=jquery.min.map
January 7, 2015 @ 10:16
Google 32841 bytes 9af32b0c4370614a502342d27e9c8954 < //@ sourceMappingURL=jquery-1.10.0.min.map
> //@ sourceMappingURL=jquery.min.map
(invalid)
cdnhttps 32841 bytes 9af32b0c4370614a502342d27e9c8954 < //@ sourceMappingURL=jquery-1.10.0.min.map
> //@ sourceMappingURL=jquery.min.map
December 24, 2015 @ 07:33

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
31662 bytes -2 bytes zopfli --i100000 --mls32 --bsr8 --lazy --ohh January 8, 2016 @ 05:55
31664 bytes -2 bytes zopfli --i10000 --mls32 --bsr8 --lazy --ohh October 13, 2015 @ 23:04
31666 bytes -2 bytes zopfli --i1000 --mls32 --bsr8 --lazy --ohh September 19, 2015 @ 05:02
31668 bytes -3 bytes zopfli --i1000 --mls4096 --bsr9 --lazy --ohh September 1, 2015 @ 20:45
31671 bytes -1 byte zopfli --i1000 --mls512 --bsr12 --lazy --ohh September 1, 2015 @ 20:41
31672 bytes zopfli --i100 --mls4096 --bsr9 --lazy --ohh September 1, 2015 @ 20:20

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 @ 14:35.

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 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
31677 31677 31677 31675 31672 31674 31673 31673 31675 31677 31676 31674 31675 31676 31674
31684 31683 31672 31684 31673 31673 31679 31671 31673 31675 31674 31675 31678 31681 31684
31663 31676 31674 31671 31681 31674 31670 31672 31675 31673 31675 31673 31672 31683 31671
31675 31674 31674 31676 31672 31673 31671 31667 31675 31673 31674 31674 31680 31684 31678
31677 31676 31676 31679 31662 31680 31679 31672 31675 31677 31672 31673 31671 31681 31673
31676 31679 31678 31680 31672 31672 31667 31674 31670 31673 31674 31668 31672 31681 31684
31676 31676 31673 31680 31672 31670 31674 31670 31673 31679 31674 31669 31684 31684 31678
31676 31677 31678 31680 31670 31673 31672 31672 31678 31680 31672 31672 31670 31687 31683
31675 31678 31674 31680 31678 31672 31669 31672 31670 31680 31672 31672 31669 31683 31684
31676 31677 31673 31669 31679 31673 31667 31672 31679 31680 31673 31671 31671 31682 31685
31674 31674 31676 31680 31672 31673 31679 31672 31672 31680 31673 31669 31670 31687 31673
31673 31677 31673 31677 31677 31672 31670 31672 31672 31679 31674 31673 31677 31684 31672
31674 31677 31678 31680 31663 31673 31667 31672 31672 31670 31673 31676 31670 31681 31671
31676 31676 31676 31676 31670 31671 31679 31673 31675 31680 31671 31666 31673 31687 31684
31676 31677 31678 31677 31679 31673 31672 31672 31672 31680 31673 31674 31670 31687 31684
31676 31677 31673 31676 31677 31672 31667 31672 31674 31680 31674 31672 31670 31682 31685
31667 31668 31673 31676 31671 31672 31678 31672 31679 31680 31674 31671 31672 31684 31673
31676 31677 31673 31677 31663 31668 31672 31672 31672 31680 31673 31672 31671 31684 31684
31677 31677 31673 31676 31670 31679 31668 31672 31672 31673 31674 31675 31670 31684 31684
31677 31677 31674 31669 31677 31673 31676 31672 31675 31680 31675 31674 31671 31682 31683
31676 31677 31673 31677 31677 31672 31668 31672 31675 31680 31674 31668 31671 31682 31674
31677 31676 31676 31678 31678 31674 31674 31672 31674 31673 31674 31674 31668 31683 31674
31676 31677 31674 31678 31670 31673 31672 31672 31672 31675 31673 31674 31672 31683 31684

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 31669 bytes 100%
1,000 31666 bytes -3 bytes 100%
10,000 31664 bytes -2 bytes 100%
100,000 31662 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
31745 bytes +83 bytes (+0.26%) +61 bytes
31749 bytes +87 bytes (+0.27%) +65 bytes
31684 bytes +22 bytes (+0.07%)
31687 bytes +25 bytes (+0.08%) +3 bytes
31695 bytes +33 bytes (+0.10%) +11 bytes
31733 bytes +71 bytes (+0.22%) +49 bytes
31741 bytes +79 bytes (+0.25%) +57 bytes
31778 bytes +116 bytes (+0.37%) +94 bytes
31815 bytes +153 bytes (+0.48%) +131 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 26078 bytes -5584 bytes (-17.64%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 26716 bytes -4946 bytes (-15.62%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 28220 bytes -3442 bytes (-10.87%)
Brotli (Wikipedia) brotli brotli -q 11 29519 bytes -2143 bytes (-6.77%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 29940 bytes -1722 bytes (-5.44%)
LZMA2 (Wikipedia) xz xz -9 30672 bytes -990 bytes (-3.13%)
ZSTD (Wikipedia) zstd zstd -19 31193 bytes -469 bytes (-1.48%)

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