Choose a version:
34% The original file has 274080 bytes (267.7k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 93064 bytes (90.9k, 34%).

After GZIP compression these minified files vary in size:
Microsoft
  41703 bytes (40.7k)
CDN
jsdelivr
  38111 bytes (37.2k)
CDN
Boot
  38108 bytes (37.2k)
CDN
Baidu
  33124 bytes (32.3k)
CDN
cdnjs
  33117 bytes (32.3k)
CDN
gzip -6 (default)
  32886 bytes (32.1k)
local copy
Google
  32862 bytes (32.1k)
CDN
cdnhttps
  32862 bytes (32.1k)
CDN
gzip -9
  32849 bytes (32.1k)
local copy
Sina
  32837 bytes (32.1k)
CDN
libdeflate -12
  31780 bytes (31.0k)
local copy
7zip -mx=9 -tgzip
  31778 bytes (31.0k)
local copy
Yandex
  31706 bytes (31.0k)
CDN
kzip -s0 -rn -b3
  31706 bytes (31.0k)
local copy
pigz -11 -n
  31706 bytes (31.0k)
local copy
Zopfli
  31682 bytes (30.9k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-1.10.1.min.js (or via HTTPS)

You will automatically get the smallest jQuery 1.10.1 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 24 bytes by using my jQuery 1.10.1 Zopfli version instead of the best available CDN (0.08% smaller than Yandex, 31682 vs. 31706 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 --mls128 --bsr22 --lazy --ohh

(found January 8, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 128  --mls128
block splitting recursion 22  --bsr22
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-1.10.1.min.js --location | md5sum
33d85132f0154466fc017dd05111873d  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.10.1.min.zopfli.js.gz | md5sum
33d85132f0154466fc017dd05111873d  -

SHA1:
curl --silent --compressed https://code.jquery.com/jquery-1.10.1.min.js --location | sha1sum
161b78ec52f28657a835e4a5423f03782fd35806  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.10.1.min.zopfli.js.gz | sha1sum
161b78ec52f28657a835e4a5423f03782fd35806  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Microsoft 41703 bytes 33d85132f0154466fc017dd05111873d (invalid)
jsdelivr 38111 bytes 33d85132f0154466fc017dd05111873d (invalid)
Sina 32837 bytes 33d85132f0154466fc017dd05111873d (invalid)

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
Boot 38108 bytes 2c348a8a373a2e0dc0f8d9cf2c87dfe1 < //@ sourceMappingURL=jquery-1.10.1.min.map
> //@ sourceMappingURL=jquery.min.map
March 18, 2015 @ 09:39
Baidu 33124 bytes 2c9c0ab2d8647b0e67f1f6dbf4f796ea < //@ sourceMappingURL=jquery-1.10.1.min.map
> //@ sourceMappingURL=jquery.min.map
January 7, 2015 @ 10:16
cdnjs 33117 bytes 2c348a8a373a2e0dc0f8d9cf2c87dfe1 < //@ sourceMappingURL=jquery-1.10.1.min.map
> //@ sourceMappingURL=jquery.min.map
(invalid)
Google 32862 bytes 2c348a8a373a2e0dc0f8d9cf2c87dfe1 < //@ sourceMappingURL=jquery-1.10.1.min.map
> //@ sourceMappingURL=jquery.min.map
(invalid)
cdnhttps 32862 bytes 2c348a8a373a2e0dc0f8d9cf2c87dfe1 < //@ sourceMappingURL=jquery-1.10.1.min.map
> //@ sourceMappingURL=jquery.min.map
December 24, 2015 @ 07:33
Yandex 31706 bytes 2c348a8a373a2e0dc0f8d9cf2c87dfe1 < //@ sourceMappingURL=jquery-1.10.1.min.map
> //@ sourceMappingURL=jquery.min.map
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:

3.3.1, 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
31682 bytes -1 byte zopfli --i100000 --mls128 --bsr22 --lazy --ohh January 8, 2016 @ 13:36
31683 bytes -1 byte zopfli --i100000 --mls128 --bsr19 --lazy --ohh October 21, 2015 @ 12:32
31684 bytes -2 bytes zopfli --i10000 --mls32 --bsr20 --lazy --ohh October 13, 2015 @ 20:05
31686 bytes -1 byte zopfli --i1000 --mls32 --bsr20 --lazy --ohh September 19, 2015 @ 04:15
31687 bytes -1 byte zopfli --i1000 --mls128 --bsr16 --lazy --ohh September 16, 2015 @ 10:17
31688 bytes -1 byte zopfli --i1000 --mls128 --bsr7 --lazy --ohh September 16, 2015 @ 10:15
31689 bytes -2 bytes zopfli --i100000 --mls512 --bsr10 --lazy --ohh September 2, 2015 @ 07:04
31691 bytes -3 bytes zopfli --i1000 --mls512 --bsr10 --lazy --ohh September 1, 2015 @ 20:41
31694 bytes zopfli --i100 --mls4096 --bsr13 --lazy --ohh September 1, 2015 @ 20:27

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 @ 14:40.

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
31700 31700 31700 31697 31697 31696 31696 31697 31697 31697 31700 31697 31696 31695 31696
31704 31705 31704 31704 31695 31697 31699 31694 31694 31692 31697 31701 31700 31702 31706
31684 31696 31696 31702 31692 31691 31703 31694 31696 31697 31697 31697 31693 31703 31693
31696 31702 31701 31694 31699 31693 31687 31701 31691 31696 31696 31696 31695 31703 31703
31696 31701 31702 31701 31695 31699 31697 31693 31697 31698 31693 31694 31697 31694 31696
31702 31695 31696 31687 31700 31693 31688 31695 31695 31701 31697 31696 31695 31695 31706
31699 31701 31701 31700 31699 31694 31694 31692 31689 31700 31695 31696 31702 31703 31703
31696 31701 31705 31701 31691 31692 31691 31694 31696 31700 31695 31695 31702 31703 31705
31692 31699 31702 31695 31699 31693 31696 31693 31692 31701 31696 31696 31693 31707 31702
31687 31694 31696 31701 31686 31696 31693 31693 31694 31699 31697 31689 31695 31707 31702
31697 31700 31696 31705 31683 31694 31699 31695 31696 31700 31697 31690 31700 31707 31704
31697 31702 31701 31703 31705 31700 31698 31693 31695 31701 31697 31696 31694 31703 31703
31698 31701 31702 31687 31687 31693 31686 31701 31699 31701 31696 31696 31693 31703 31703
31699 31702 31697 31695 31699 31693 31695 31693 31696 31700 31695 31691 31695 31703 31703
31697 31702 31701 31705 31696 31701 31704 31693 31694 31697 31696 31697 31693 31703 31704
31698 31700 31701 31699 31692 31700 31683 31693 31699 31700 31695 31693 31693 31703 31703
31688 31695 31694 31690 31684 31694 31704 31694 31700 31700 31695 31697 31693 31703 31695
31697 31700 31701 31701 31692 31693 31696 31694 31690 31700 31694 31691 31702 31703 31704
31699 31702 31700 31700 31691 31700 31682 31694 31697 31697 31695 31697 31694 31703 31705
31698 31702 31701 31693 31704 31700 31703 31694 31691 31697 31696 31696 31693 31703 31703
31699 31702 31701 31705 31705 31692 31702 31694 31695 31700 31696 31693 31692 31701 31702
31699 31702 31701 31691 31704 31700 31694 31693 31695 31697 31697 31696 31695 31703 31703
31697 31700 31702 31701 31686 31695 31693 31693 31695 31695 31696 31696 31694 31703 31704

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 31690 bytes 100%
1,000 31686 bytes -4 bytes 100%
10,000 31684 bytes -2 bytes 100%
100,000 31682 bytes -2 bytes 1.74%
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
31771 bytes +89 bytes (+0.28%) +65 bytes
31769 bytes +87 bytes (+0.27%) +63 bytes
31707 bytes +25 bytes (+0.08%) +1 byte
31706 bytes +24 bytes (+0.08%)
31720 bytes +38 bytes (+0.12%) +14 bytes
31754 bytes +72 bytes (+0.23%) +48 bytes
31765 bytes +83 bytes (+0.26%) +59 bytes
31803 bytes +121 bytes (+0.38%) +97 bytes
31835 bytes +153 bytes (+0.48%) +129 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 26085 bytes -5597 bytes (-17.67%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 26722 bytes -4960 bytes (-15.66%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 28227 bytes -3455 bytes (-10.91%)
Brotli (Wikipedia) brotli brotli -q 11 29546 bytes -2136 bytes (-6.74%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 29970 bytes -1712 bytes (-5.40%)
LZMA2 (Wikipedia) xz xz -9 30700 bytes -982 bytes (-3.10%)
Zstandard (Wikipedia) zstd zstd -19 31208 bytes -474 bytes (-1.50%)

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