Choose a version:
36% The original file has 57737 bytes (56.4k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 20720 bytes (20.2k, 36%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  10686 bytes (10.4k)
 local copy
gzip -9
  10685 bytes (10.4k)
 local copy
libdeflate -12
  10453 bytes (10.2k)
 local copy
7zip -mx=9 -tgzip
  10344 bytes (10.1k)
 local copy
zultra
  10280 bytes (10.0k)
 local copy
pigz -11 -n
  10266 bytes (10.0k)
 local copy
kzip -s0 -rn -b2
  10262 bytes (10.0k)
 local copy
Zopfli
  10239 bytes (10.0k)
 local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-1.1.1.pack.js (or via HTTPS)

You will automatically get the smallest jQuery 1.1.1 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 --mls2048 --bsr7 --lazy --ohh

(found January 4, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 2048  --mls2048
block splitting recursion 7  --bsr7
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-1.1.1.pack.js --location | md5sum
160014f46c313f6c904f62f2576ac798  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.1.1.pack.zopfli.js.gz | md5sum
160014f46c313f6c904f62f2576ac798  -

SHA1:
curl --silent --compressed https://code.jquery.com/jquery-1.1.1.pack.js --location | sha1sum
24dd74d65d2e02aae973af97ebbb31b9820a5bbb  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.1.1.pack.zopfli.js.gz | sha1sum
24dd74d65d2e02aae973af97ebbb31b9820a5bbb  -

Other Versions

Available jQuery versions at minime.stephan-brumme.com:

3.6.1, 3.6.0,
3.5.1, 3.5.0,
3.4.1, 3.4.0,
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
10239 bytes -1 byte zopfli --i100000 --mls2048 --bsr7 --lazy --ohh January 4, 2016 @ 16:24
10240 bytes -1 byte zopfli --i100000 --mls1024 --bsr14 --lazy --ohh November 23, 2015 @ 08:38
10241 bytes -2 bytes zopfli --i1000 --mls1024 --bsr14 --lazy --ohh September 17, 2015 @ 13:11
10243 bytes -1 byte zopfli --i1000 --mls2048 --bsr7 --lazy --ohh September 16, 2015 @ 18:34
10244 bytes -1 byte zopfli --i1000 --mls128 --bsr9 --lazy --ohh September 16, 2015 @ 18:26
10245 bytes – zopfli --i100 --mls1024 --bsr7 --lazy --ohh September 11, 2015 @ 11:20

If there are multiple parameter sets yielding the same compressed size, only the first one found is shown.

Most recent activity on July 20, 2020 @ 12:56.

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
2 10291 10287 10277 10282 10277 10279 10281 10276 10279 10285 10288 10290 10285 10285 10287
4 10281 10285 10290 10289 10291 10294 10292 10277 10253 10269 10274 10257 10254 10256 10256
6 10256 10256 10253 10258 10248 10257 10257 10246 10248 10248 10243 10256 10254 10259 10259
7 10247 10247 10248 10252 10246 10257 10257 10244 10244 10243 10239 10250 10250 10258 10256
8 10246 10246 10247 10244 10248 10257 10257 10246 10243 10244 10239 10257 10252 10251 10252
9 10246 10247 10247 10247 10249 10257 10243 10246 10248 10256 10261 10247 10256 10254 10254
10 10252 10250 10247 10263 10248 10243 10248 10243 10244 10243 10252 10250 10249 10252 10253
11 10245 10244 10248 10245 10246 10244 10245 10243 10244 10244 10244 10251 10258 10252 10250
12 10241 10241 10243 10242 10245 10244 10244 10244 10247 10246 10254 10252 10252 10251 10256
13 10244 10246 10246 10257 10255 10251 10249 10243 10244 10246 10244 10258 10252 10255 10256
14 10252 10251 10243 10246 10246 10243 10244 10243 10248 10240 10252 10256 10251 10252 10248
15 10244 10250 10244 10247 10245 10244 10244 10244 10244 10243 10242 10250 10249 10255 10252
16 10249 10249 10245 10250 10247 10244 10245 10245 10244 10246 10253 10250 10262 10253 10253
17 10244 10249 10246 10247 10243 10244 10244 10244 10244 10247 10253 10252 10256 10251 10253
18 10246 10253 10250 10249 10248 10250 10244 10244 10247 10242 10254 10252 10251 10255 10256
19 10243 10243 10243 10247 10258 10243 10244 10247 10244 10246 10243 10251 10249 10254 10256
20 10245 10261 10249 10244 10246 10243 10244 10244 10244 10244 10253 10253 10257 10254 10255
21 10252 10263 10243 10251 10243 10243 10246 10243 10243 10244 10254 10250 10250 10254 10252
22 10244 10258 10245 10245 10245 10243 10243 10243 10244 10244 10244 10252 10252 10253 10252
23 10245 10247 10243 10247 10244 10243 10244 10243 10245 10244 10244 10250 10258 10254 10253
25 10244 10246 10244 10249 10244 10246 10244 10244 10244 10244 10244 10250 10247 10252 10248
30 10253 10250 10246 10247 10248 10244 10245 10244 10244 10245 10240 10257 10247 10253 10252
40 10250 10250 10246 10247 10251 10244 10244 10243 10247 10248 10244 10254 10251 10254 10244

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 10244 bytes – 100%
1,000 10241 bytes -3 bytes 100%
10,000 10241 bytes – 100%
100,000 10239 bytes -2 bytes 2.61%
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
(any) 10263 bytes +24 bytes (+0.23%) +1 byte
1 10446 bytes +207 bytes (+2.02%) +184 bytes
2 10262 bytes +23 bytes (+0.22%) –
3 10274 bytes +35 bytes (+0.34%) +12 bytes
4 10292 bytes +53 bytes (+0.52%) +30 bytes
5 10293 bytes +54 bytes (+0.53%) +31 bytes
6 10322 bytes +83 bytes (+0.81%) +60 bytes
7 10356 bytes +117 bytes (+1.14%) +94 bytes
8 10401 bytes +162 bytes (+1.58%) +139 bytes

Non-DEFLATE Algorithms

Archivers based on completely different compression algorithms often produce superior results.
Unfortunately, browsers only support gzip compression at the moment.
However, support for Brotli is constantly growing - for example, your browser actually supports it !
Algorithm Program Parameters Size Compared To Best Zopfli
Brotli (Wikipedia) brotli brotli -q 11 9533 bytes -706 bytes (-6.90%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 9856 bytes -383 bytes (-3.74%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 9933 bytes -306 bytes (-2.99%)
ZPAQ (Wikipedia) zpaq zpaq -method 69 10049 bytes -190 bytes (-1.86%)
LZMA2 (Wikipedia) xz xz -9 10112 bytes -127 bytes (-1.24%)
Zstandard (Wikipedia) zstd zstd -19 10437 bytes +198 bytes (+1.93%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 10704 bytes +465 bytes (+4.54%)

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):
Load and Parse Data


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 2024.
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

All trademarks are property of their respective owners. You know, the boring legal stuff.