Choose a version:
34% The original file has 62726 bytes (61.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 21472 bytes (21.0k, 34%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  11092 bytes (10.8k)
 local copy
gzip -9
  11091 bytes (10.8k)
 local copy
libdeflate -12
  10830 bytes (10.6k)
 local copy
7zip -mx=9 -tgzip
  10753 bytes (10.5k)
 local copy
zultra
  10701 bytes (10.5k)
 local copy
kzip -s0 -rn -b0
  10657 bytes (10.4k)
 local copy
pigz -11 -n
  10651 bytes (10.4k)
 local copy
Zopfli
  10630 bytes (10.4k)
 local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-1.1.3.pack.js (or via HTTPS)

You will automatically get the smallest jQuery 1.1.3 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 --mls16384 --bsr17 --lazy --ohh

(found November 23, 2015)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 16384  --mls16384
block splitting recursion 17  --bsr17
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-1.1.3.pack.js --location | md5sum
603975394118ec6275c6bb5d73ae4ca4  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.1.3.pack.zopfli.js.gz | md5sum
603975394118ec6275c6bb5d73ae4ca4  -

SHA1:
curl --silent --compressed https://code.jquery.com/jquery-1.1.3.pack.js --location | sha1sum
b9c72aa78de3c124248f30234c64bf6f3b1a7cb5  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.1.3.pack.zopfli.js.gz | sha1sum
b9c72aa78de3c124248f30234c64bf6f3b1a7cb5  -

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
10630 bytes -1 byte zopfli --i100000 --mls16384 --bsr17 --lazy --ohh November 23, 2015 @ 12:11
10631 bytes -1 byte zopfli --i10000 --mls16384 --bsr17 --lazy --ohh November 23, 2015 @ 08:26
10632 bytes -1 byte zopfli --i1000 --mls16384 --bsr17 --lazy --ohh September 22, 2015 @ 04:12
10633 bytes -1 byte zopfli --i1000 --mls16384 --bsr16 --lazy --ohh September 16, 2015 @ 18:13
10634 bytes -3 bytes zopfli --i1000 --mls64 --bsr7 --lazy --ohh September 16, 2015 @ 18:07
10637 bytes – zopfli --i100 --mls64 --bsr9 --lazy --ohh September 11, 2015 @ 16:34

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 @ 12:54.

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 10683 10679 10685 10687 10684 10677 10673 10684 10696 10670 10667 10672 10675 10673 10698
4 10652 10653 10656 10652 10651 10652 10642 10639 10654 10655 10662 10653 10654 10654 10660
6 10646 10643 10644 10651 10649 10648 10636 10646 10642 10636 10634 10636 10636 10637 10639
7 10646 10646 10647 10647 10636 10633 10634 10636 10640 10634 10635 10636 10636 10639 10639
8 10647 10642 10644 10648 10636 10635 10635 10636 10638 10636 10633 10636 10632 10643 10639
9 10637 10639 10646 10649 10646 10633 10636 10644 10638 10638 10632 10633 10633 10659 10648
10 10639 10649 10640 10638 10637 10636 10636 10637 10640 10638 10633 10640 10635 10633 10642
11 10635 10635 10631 10637 10640 10641 10636 10636 10636 10638 10634 10636 10636 10633 10644
12 10641 10639 10643 10638 10637 10636 10635 10634 10638 10635 10636 10635 10637 10645 10645
13 10632 10637 10640 10639 10636 10634 10637 10637 10637 10634 10632 10639 10635 10632 10638
14 10646 10645 10643 10648 10647 10641 10637 10636 10644 10639 10635 10635 10634 10642 10646
15 10639 10639 10644 10636 10641 10634 10634 10636 10637 10635 10634 10636 10633 10632 10633
16 10651 10638 10638 10641 10641 10638 10636 10638 10639 10636 10634 10636 10633 10632 10636
17 10646 10638 10632 10641 10639 10635 10637 10637 10639 10635 10634 10636 10638 10630 10644
18 10642 10642 10635 10640 10637 10636 10636 10635 10638 10633 10632 10635 10635 10643 10638
19 10642 10640 10633 10638 10644 10632 10636 10643 10638 10639 10635 10632 10632 10633 10638
20 10638 10642 10640 10637 10639 10636 10634 10636 10637 10634 10635 10636 10636 10630 10639
21 10641 10639 10645 10638 10637 10637 10637 10636 10636 10632 10634 10636 10636 10634 10638
22 10632 10634 10638 10639 10637 10637 10635 10636 10636 10637 10633 10633 10633 10642 10648
23 10634 10634 10639 10634 10638 10634 10637 10636 10637 10635 10633 10634 10636 10632 10639
25 10632 10640 10639 10639 10636 10633 10635 10635 10637 10636 10634 10638 10633 10638 10634
30 10638 10638 10643 10638 10637 10634 10636 10636 10637 10635 10634 10636 10637 10634 10651
40 10642 10642 10639 10640 10638 10638 10637 10639 10638 10636 10634 10633 10639 10633 10632

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 10635 bytes – 100%
1,000 10632 bytes -3 bytes 100%
10,000 10631 bytes -1 byte 100%
100,000 10630 bytes -1 byte 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
(any) 10657 bytes +27 bytes (+0.25%) –
1 10829 bytes +199 bytes (+1.87%) +172 bytes
2 10657 bytes +27 bytes (+0.25%) –
3 10658 bytes +28 bytes (+0.26%) +1 byte
4 10673 bytes +43 bytes (+0.40%) +16 bytes
5 10697 bytes +67 bytes (+0.63%) +40 bytes
6 10703 bytes +73 bytes (+0.69%) +46 bytes
7 10738 bytes +108 bytes (+1.02%) +81 bytes
8 10770 bytes +140 bytes (+1.32%) +113 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 9860 bytes -770 bytes (-7.24%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 10094 bytes -536 bytes (-5.04%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 10169 bytes -461 bytes (-4.34%)
ZPAQ (Wikipedia) zpaq zpaq -method 69 10230 bytes -400 bytes (-3.76%)
LZMA2 (Wikipedia) xz xz -9 10440 bytes -190 bytes (-1.79%)
Zstandard (Wikipedia) zstd zstd -19 10782 bytes +152 bytes (+1.43%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 10921 bytes +291 bytes (+2.74%)

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 2026.
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.