Choose a version:
38% The original file has 45777 bytes (44.7k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 17334 bytes (16.9k, 38%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  8972 bytes (8.8k)
local copy
gzip -9
  8972 bytes (8.8k)
local copy
libdeflate -12
  8783 bytes (8.6k)
local copy
7zip -mx=9 -tgzip
  8705 bytes (8.5k)
local copy
pigz -11 -n
  8635 bytes (8.4k)
local copy
kzip -s0 -rn -b0
  8625 bytes (8.4k)
local copy
Zopfli
  8610 bytes (8.4k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-1.0.1.pack.js

You will automatically get the smallest jQuery 1.0.1 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

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 --mls8 --bsr9 --lazy --ohh

(found November 23, 2015)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 8  --mls8
block splitting recursion 9  --bsr9
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-1.0.1.pack.js --location | md5sum
c46cc6cc11018a5ac8c6d474bac23639  -
curl --silent --compressed http://minime.stephan-brumme.com/files/jquery/jquery-1.0.1.pack.zopfli.js.gz | md5sum
c46cc6cc11018a5ac8c6d474bac23639  -

SHA1:
curl --silent --compressed http://code.jquery.com/jquery-1.0.1.pack.js --location | sha1sum
08341cd159e29f561ca0ec16c99bf4b85e43d30f  -
curl --silent --compressed http://minime.stephan-brumme.com/files/jquery/jquery-1.0.1.pack.zopfli.js.gz | sha1sum
08341cd159e29f561ca0ec16c99bf4b85e43d30f  -

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
8610 bytes -1 byte zopfli --i100000 --mls8 --bsr9 --lazy --ohh November 23, 2015 @ 12:06
8611 bytes -1 byte zopfli --i10000 --mls8 --bsr25 --lazy --ohh November 23, 2015 @ 08:23
8612 bytes -2 bytes zopfli --i10000 --mls2 --bsr6 --lazy --ohh November 23, 2015 @ 08:21
8614 bytes -1 byte zopfli --i1000 --mls8 --bsr13 --lazy --ohh September 20, 2015 @ 19:08
8615 bytes -1 byte zopfli --i1000 --mls8 --bsr14 --lazy --ohh September 20, 2015 @ 19:07
8616 bytes -1 byte zopfli --i1000 --mls1024 --bsr7 --lazy --ohh September 16, 2015 @ 19:02
8617 bytes -3 bytes zopfli --i1000 --mls256 --bsr12 --lazy --ohh September 16, 2015 @ 19:01
8620 bytes -1 byte zopfli --i1000 --mls256 --bsr13 --lazy --ohh September 16, 2015 @ 19:01
8621 bytes zopfli --i100 --mls16384 --bsr14 --lazy --ohh September 11, 2015 @ 14:50

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
8631 8630 8632 8633 8635 8633 8628 8619 8621 8631 8628 8628 8625 8638 8637
8614 8616 8616 8614 8617 8614 8623 8619 8654 8642 8639 8648 8618 8652 8658
8612 8617 8612 8614 8617 8614 8621 8620 8614 8613 8624 8623 8620 8621 8621
8614 8617 8615 8615 8614 8614 8616 8619 8615 8613 8621 8618 8620 8620 8626
8628 8631 8632 8633 8633 8632 8628 8624 8625 8614 8619 8619 8622 8636 8636
8617 8617 8610 8614 8614 8614 8617 8617 8616 8613 8622 8621 8622 8620 8620
8617 8613 8614 8614 8618 8614 8616 8615 8614 8613 8619 8618 8618 8618 8618
8616 8616 8615 8614 8614 8614 8614 8619 8614 8614 8618 8619 8618 8621 8622
8617 8618 8616 8615 8616 8614 8614 8615 8613 8614 8622 8619 8619 8620 8620
8616 8617 8612 8614 8615 8614 8617 8619 8613 8614 8619 8622 8620 8618 8618
8617 8617 8613 8614 8615 8614 8614 8616 8613 8613 8621 8619 8619 8616 8616
8616 8617 8615 8614 8616 8614 8614 8618 8614 8614 8622 8620 8620 8617 8617
8616 8618 8612 8614 8615 8614 8618 8616 8614 8614 8619 8617 8618 8616 8616
8617 8618 8613 8614 8619 8614 8614 8621 8615 8614 8617 8620 8620 8622 8622
8614 8617 8613 8614 8614 8614 8617 8619 8615 8614 8622 8620 8619 8619 8616
8617 8616 8616 8615 8614 8614 8614 8616 8614 8613 8623 8619 8617 8620 8620
8616 8613 8615 8616 8615 8614 8614 8619 8614 8614 8621 8621 8618 8619 8619
8617 8616 8615 8614 8619 8614 8614 8616 8614 8613 8618 8617 8617 8619 8619
8614 8618 8615 8617 8618 8614 8614 8619 8615 8614 8621 8620 8618 8622 8622
8616 8617 8616 8614 8614 8614 8614 8616 8615 8613 8619 8620 8617 8619 8619
8616 8613 8610 8614 8615 8614 8614 8616 8613 8613 8622 8618 8620 8618 8618
8616 8617 8615 8614 8614 8614 8617 8613 8615 8619 8622 8621 8620 8620 8620
8617 8615 8615 8615 8614 8614 8614 8619 8615 8614 8621 8617 8617 8619 8619

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 8615 bytes 100%
1,000 8614 bytes -1 byte 100%
10,000 8611 bytes -3 bytes 100%
100,000 8610 bytes -1 byte 2.90%
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
8625 bytes +15 bytes (+0.17%)
8778 bytes +168 bytes (+1.95%) +153 bytes
8626 bytes +16 bytes (+0.19%) +1 byte
8634 bytes +24 bytes (+0.28%) +9 bytes
8655 bytes +45 bytes (+0.52%) +30 bytes
8688 bytes +78 bytes (+0.91%) +63 bytes
8727 bytes +117 bytes (+1.36%) +102 bytes
8744 bytes +134 bytes (+1.56%) +119 bytes
8776 bytes +166 bytes (+1.93%) +151 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 7949 bytes -661 bytes (-7.68%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 8275 bytes -335 bytes (-3.89%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 8355 bytes -255 bytes (-2.96%)
LZMA2 (Wikipedia) xz xz -9 8500 bytes -110 bytes (-1.28%)
ZPAQ (Wikipedia) zpaq zpaq -method 69 8560 bytes -50 bytes (-0.58%)
ZSTD (Wikipedia) zstd zstd -19 8760 bytes +150 bytes (+1.74%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 8994 bytes +384 bytes (+4.46%)

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