Choose a version:
37% The original file has 52401 bytes (51.2k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 19285 bytes (18.8k, 37%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  9896 bytes (9.7k)
local copy
gzip -9
  9896 bytes (9.7k)
local copy
libdeflate -12
  9695 bytes (9.5k)
local copy
7zip -mx=9 -tgzip
  9589 bytes (9.4k)
local copy
pigz -11 -n
  9521 bytes (9.3k)
local copy
kzip -s0 -rn -b2
  9511 bytes (9.3k)
local copy
Zopfli
  9499 bytes (9.3k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-1.0.4.pack.js

You will automatically get the smallest jQuery 1.0.4 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

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 --i10000 --mb8 --mls64 --bsr4 --lazy --ohh

(found October 14, 2015)
Description Value Parameter
iterations 10000  --i10000
maximum blocks 8  --mb8
maximum length score 64  --mls64
block splitting recursion 4  --bsr4
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-1.0.4.pack.js --location | md5sum
dad3a707469677b501f822b3a655989d  -
curl --silent --compressed http://minime.stephan-brumme.com/files/jquery/jquery-1.0.4.pack.zopfli.js.gz | md5sum
dad3a707469677b501f822b3a655989d  -

SHA1:
curl --silent --compressed http://code.jquery.com/jquery-1.0.4.pack.js --location | sha1sum
4a2c9fd552e1ca9ad66feaaad365990b1e664a8f  -
curl --silent --compressed http://minime.stephan-brumme.com/files/jquery/jquery-1.0.4.pack.zopfli.js.gz | sha1sum
4a2c9fd552e1ca9ad66feaaad365990b1e664a8f  -

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
9499 bytes -1 byte zopfli --i10000 --mls64 --bsr4 --lazy --ohh October 14, 2015 @ 11:11
9500 bytes -3 bytes zopfli --i1000 --mls256 --bsr7 --lazy --ohh September 16, 2015 @ 18:41
9503 bytes -2 bytes zopfli --i1000 --mls64 --bsr2 --lazy --ohh September 16, 2015 @ 18:40
9505 bytes zopfli --i100 --mls128 --bsr11 --lazy --ohh September 11, 2015 @ 11:28

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
9515 9514 9509 9506 9511 9502 9507 9511 9520 9530 9532 9531 9531 9528 9530
9526 9524 9506 9509 9503 9499 9548 9539 9530 9518 9519 9522 9537 9539 9539
9506 9508 9508 9505 9508 9508 9505 9499 9499 9512 9501 9505 9504 9503 9503
9505 9505 9504 9505 9504 9505 9505 9499 9499 9510 9500 9502 9502 9503 9503
9513 9517 9510 9507 9506 9513 9505 9511 9499 9512 9502 9501 9505 9502 9508
9510 9510 9507 9507 9507 9504 9503 9499 9499 9510 9505 9504 9504 9503 9503
9509 9510 9505 9508 9507 9505 9509 9499 9499 9511 9506 9508 9507 9503 9503
9505 9507 9505 9505 9512 9506 9502 9499 9499 9510 9505 9506 9504 9504 9503
9505 9509 9504 9507 9506 9505 9503 9499 9501 9506 9505 9504 9504 9503 9503
9505 9504 9506 9505 9506 9505 9506 9499 9501 9499 9506 9511 9503 9513 9518
9504 9509 9507 9507 9509 9506 9507 9501 9499 9511 9505 9504 9504 9502 9502
9506 9505 9505 9506 9510 9505 9508 9499 9499 9511 9502 9508 9504 9504 9503
9506 9508 9507 9505 9503 9505 9506 9499 9499 9510 9501 9507 9504 9505 9504
9505 9506 9510 9508 9503 9507 9510 9501 9499 9512 9506 9503 9504 9503 9504
9505 9507 9506 9506 9506 9502 9509 9499 9499 9506 9504 9504 9508 9508 9508
9505 9508 9507 9503 9507 9506 9506 9499 9499 9506 9504 9505 9509 9504 9504
9511 9506 9506 9506 9506 9505 9508 9499 9499 9500 9501 9510 9507 9505 9504
9506 9505 9508 9507 9503 9505 9505 9499 9499 9506 9505 9501 9504 9504 9504
9510 9513 9506 9505 9501 9509 9509 9499 9499 9510 9503 9507 9507 9503 9503
9505 9505 9505 9507 9506 9502 9509 9499 9499 9510 9505 9512 9503 9503 9504
9505 9505 9505 9505 9506 9502 9505 9499 9499 9511 9500 9508 9507 9503 9503
9506 9510 9505 9505 9508 9502 9507 9499 9499 9510 9505 9504 9504 9504 9504
9507 9511 9506 9506 9508 9505 9505 9499 9499 9506 9500 9503 9504 9504 9504

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 9505 bytes 100%
1,000 9500 bytes -5 bytes 100%
10,000 9499 bytes -1 byte 100%
100,000 9499 bytes 11.30%
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
9511 bytes +12 bytes (+0.13%)
9689 bytes +190 bytes (+2.00%) +178 bytes
9511 bytes +12 bytes (+0.13%)
9524 bytes +25 bytes (+0.26%) +13 bytes
9540 bytes +41 bytes (+0.43%) +29 bytes
9561 bytes +62 bytes (+0.65%) +50 bytes
9585 bytes +86 bytes (+0.91%) +74 bytes
9624 bytes +125 bytes (+1.32%) +113 bytes
9658 bytes +159 bytes (+1.67%) +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
Brotli (Wikipedia) brotli brotli -q 11 8771 bytes -728 bytes (-7.66%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 9144 bytes -355 bytes (-3.74%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 9224 bytes -275 bytes (-2.90%)
ZPAQ (Wikipedia) zpaq zpaq -method 69 9318 bytes -181 bytes (-1.91%)
LZMA2 (Wikipedia) xz xz -9 9360 bytes -139 bytes (-1.46%)
ZSTD (Wikipedia) zstd zstd -19 9671 bytes +172 bytes (+1.81%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 9925 bytes +426 bytes (+4.48%)

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 2017.
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