Choose a version:
38% The original file has 45369 bytes (44.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 17171 bytes (16.8k, 38%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  8899 bytes (8.7k)
local copy
gzip -9
  8898 bytes (8.7k)
local copy
libdeflate -12
  8715 bytes (8.5k)
local copy
7zip -mx=9 -tgzip
  8633 bytes (8.4k)
local copy
pigz -11 -n
  8575 bytes (8.4k)
local copy
kzip -s0 -rn -b2
  8558 bytes (8.4k)
local copy
Zopfli
  8545 bytes (8.3k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-1.0.pack.js (or via HTTPS)

You will automatically get the smallest jQuery 1.0 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

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 --mls512 --bsr20 --lazy --ohh

(found November 23, 2015)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 512  --mls512
block splitting recursion 20  --bsr20
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-1.0.pack.js --location | md5sum
a4c423deaeb404daf145ac9231b0785c  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.0.pack.zopfli.js.gz | md5sum
a4c423deaeb404daf145ac9231b0785c  -

SHA1:
curl --silent --compressed https://code.jquery.com/jquery-1.0.pack.js --location | sha1sum
88c03b5c437ac3551661ecfbe6e1de155c3099c4  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.0.pack.zopfli.js.gz | sha1sum
88c03b5c437ac3551661ecfbe6e1de155c3099c4  -

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
8545 bytes -1 byte zopfli --i100000 --mls512 --bsr20 --lazy --ohh November 23, 2015 @ 11:59
8546 bytes -1 byte zopfli --i10000 --mls512 --bsr20 --lazy --ohh November 23, 2015 @ 08:21
8547 bytes -1 byte zopfli --i10000 --mls128 --bsr7 --lazy --ohh November 23, 2015 @ 08:20
8548 bytes -2 bytes zopfli --i1000 --mls128 --bsr7 --lazy --ohh September 20, 2015 @ 20:54
8550 bytes -4 bytes zopfli --i1000 --mls128 --bsr14 --lazy --ohh September 16, 2015 @ 19:06
8554 bytes -2 bytes zopfli --i1000 --mls128 --bsr10 --lazy --ohh September 16, 2015 @ 19:05
8556 bytes zopfli --i100 --mls128 --bsr14 --lazy --ohh September 11, 2015 @ 11:19

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 @ 14:39.

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
8568 8569 8568 8570 8575 8571 8567 8555 8554 8567 8568 8565 8563 8565 8566
8555 8552 8552 8552 8552 8551 8549 8548 8552 8578 8581 8591 8557 8598 8598
8548 8549 8555 8549 8549 8551 8549 8552 8551 8550 8553 8559 8560 8551 8551
8557 8551 8557 8552 8549 8549 8545 8552 8549 8552 8555 8558 8561 8558 8559
8569 8572 8571 8552 8552 8550 8567 8557 8553 8550 8553 8562 8573 8578 8580
8552 8548 8554 8553 8551 8550 8553 8550 8549 8551 8554 8563 8558 8559 8559
8552 8551 8553 8549 8550 8550 8552 8552 8546 8552 8553 8562 8563 8560 8560
8554 8550 8552 8553 8551 8550 8546 8553 8554 8550 8553 8562 8560 8559 8559
8552 8555 8553 8549 8552 8551 8548 8552 8550 8550 8551 8563 8561 8564 8564
8549 8548 8551 8549 8550 8551 8548 8550 8551 8551 8552 8561 8560 8567 8567
8551 8552 8551 8552 8551 8550 8548 8549 8546 8551 8555 8564 8561 8561 8561
8552 8553 8551 8552 8551 8550 8548 8553 8548 8551 8559 8562 8556 8559 8562
8546 8552 8550 8553 8550 8549 8549 8552 8554 8552 8553 8557 8557 8557 8559
8552 8552 8551 8553 8550 8550 8548 8552 8548 8551 8559 8561 8559 8560 8562
8553 8549 8552 8552 8549 8550 8548 8552 8550 8550 8559 8561 8554 8562 8562
8552 8552 8551 8552 8550 8551 8549 8545 8551 8552 8558 8562 8558 8560 8560
8552 8548 8552 8552 8550 8551 8546 8548 8545 8552 8559 8557 8560 8562 8565
8553 8552 8551 8552 8550 8552 8549 8552 8552 8550 8559 8559 8559 8563 8563
8552 8551 8552 8552 8549 8551 8548 8552 8553 8550 8554 8558 8561 8559 8559
8552 8552 8551 8549 8548 8551 8548 8546 8550 8550 8553 8563 8558 8562 8562
8549 8550 8553 8552 8551 8551 8549 8548 8549 8551 8551 8562 8561 8561 8561
8550 8552 8552 8552 8550 8550 8548 8548 8553 8551 8558 8558 8552 8562 8562
8551 8552 8551 8552 8551 8551 8549 8549 8546 8554 8551 8562 8561 8566 8566

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 8552 bytes 100%
1,000 8548 bytes -4 bytes 100%
10,000 8546 bytes -2 bytes 100%
100,000 8545 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
8558 bytes +13 bytes (+0.15%)
8711 bytes +166 bytes (+1.94%) +153 bytes
8558 bytes +13 bytes (+0.15%)
8562 bytes +17 bytes (+0.20%) +4 bytes
8584 bytes +39 bytes (+0.46%) +26 bytes
8617 bytes +72 bytes (+0.84%) +59 bytes
8634 bytes +89 bytes (+1.04%) +76 bytes
8666 bytes +121 bytes (+1.42%) +108 bytes
8695 bytes +150 bytes (+1.76%) +137 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 7943 bytes -602 bytes (-7.05%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 8218 bytes -327 bytes (-3.83%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 8298 bytes -247 bytes (-2.89%)
LZMA2 (Wikipedia) xz xz -9 8432 bytes -113 bytes (-1.32%)
ZPAQ (Wikipedia) zpaq zpaq -method 69 8540 bytes -5 bytes (-0.06%)
Zstandard (Wikipedia) zstd zstd -19 8689 bytes +144 bytes (+1.69%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 8941 bytes +396 bytes (+4.63%)

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