Choose a version:
31% The original file has 289812 bytes (283.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 89664 bytes (87.6k, 31%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  31052 bytes (30.3k)
local copy
gzip -9
  30977 bytes (30.3k)
local copy
7zip -mx=9 -tgzip
  30019 bytes (29.3k)
local copy
libdeflate -12
  29979 bytes (29.3k)
local copy
zultra
  29929 bytes (29.2k)
local copy
pigz -11 -n
  29905 bytes (29.2k)
local copy
Zopfli
  29901 bytes (29.2k)
local copy
Zopfli (defluff)
  29900 bytes (29.2k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-3.6.1.min.js (or via HTTPS)

You will automatically get the smallest jQuery 3.6.1 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 --i100 --mb8 --mls8192 --bsr13 --lazy --ohh

(found September 19, 2022)
Description Value Parameter
iterations 100  --i100
maximum blocks 8  --mb8
maximum length score 8192  --mls8192
block splitting recursion 13  --bsr13
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

Even Smaller Files Thanks To Defluff

Zopfli's output can be further optimized by the defluff tool.
In this particular case, defluff saves 1 more byte (29900 bytes).

Verify file integrity

After decompression, my uncompressed files are identical to the original ones:

MD5:
curl --silent --compressed https://code.jquery.com/jquery-3.6.1.min.js --location | md5sum
00727d1d5d9c90f7de826f1a4a9cc632  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-3.6.1.min.zopfli.js.gz | md5sum
00727d1d5d9c90f7de826f1a4a9cc632  -

SHA1:
curl --silent --compressed https://code.jquery.com/jquery-3.6.1.min.js --location | sha1sum
ea61688671d0c3044f2c5b2f2c4af0a6620ac6c2  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-3.6.1.min.zopfli.js.gz | sha1sum
ea61688671d0c3044f2c5b2f2c4af0a6620ac6c2  -

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
29901 bytes zopfli --i100 --mls8192 --bsr13 --lazy --ohh September 19, 2022 @ 14:46

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

Most recent activity on September 19, 2022 @ 15:17.

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:
100.
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
29909 29909 29910 29910 29911 29923 29909 29907 29912 29913 29913 29914 29902 29904 29934
29941 29909 29941 29943 29941 29914 29935 29909 29903 29904 29906 29916 29905 29904 29933
29928 29916 29917 29915 29913 29916 29903 29916 29909 29904 29903 29903 29923 29917 29929
29919 29917 29916 29927 29915 29914 29913 29915 29904 29904 29918 29904 29902 29909 29923
29917 29918 29916 29919 29919 29919 29911 29907 29912 29913 29916 29903 29903 29908 29932
29939 29915 29942 29943 29918 29917 29933 29911 29904 29904 29902 29903 29905 29909 29933
29917 29914 29917 29919 29915 29918 29931 29911 29909 29904 29902 29904 29921 29910 29930
29917 29916 29915 29917 29918 29918 29913 29917 29904 29912 29916 29903 29903 29917 29928
29941 29917 29914 29920 29919 29918 29933 29908 29904 29908 29916 29903 29905 29912 29931
29940 29918 29915 29921 29919 29918 29932 29910 29904 29904 29916 29903 29901 29917 29930
29915 29915 29916 29919 29916 29917 29914 29901 29909 29904 29902 29904 29905 29910 29930
29918 29917 29916 29927 29919 29914 29901 29916 29904 29904 29903 29904 29905 29909 29930
29915 29916 29915 29920 29918 29915 29903 29910 29909 29904 29903 29903 29902 29922 29932
29917 29917 29914 29919 29918 29913 29933 29915 29904 29912 29902 29904 29903 29909 29932
29918 29916 29916 29918 29916 29918 29901 29909 29904 29904 29916 29904 29905 29923 29929
29915 29916 29915 29918 29918 29915 29911 29910 29904 29904 29917 29904 29902 29917 29929
29944 29916 29914 29941 29918 29919 29934 29915 29909 29904 29902 29904 29909 29922 29928
29915 29915 29915 29917 29918 29917 29934 29912 29910 29904 29902 29904 29905 29917 29930
29915 29915 29916 29919 29916 29920 29913 29917 29902 29905 29916 29903 29923 29916 29928
29918 29914 29916 29919 29918 29916 29911 29916 29904 29904 29916 29903 29903 29916 29932
29917 29915 29915 29920 29917 29918 29931 29911 29904 29904 29902 29903 29905 29909 29930
29918 29918 29916 29920 29919 29914 29931 29910 29904 29904 29902 29904 29903 29917 29932
29918 29917 29915 29919 29917 29916 29911 29903 29904 29904 29902 29904 29901 29916 29933

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 29901 bytes 100%
1,000
10,000
100,000
1,000,000
10,000,000

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
ZPAQ (Wikipedia) zpaq zpaq -method 69 25023 bytes -4878 bytes (-16.31%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 25434 bytes -4467 bytes (-14.94%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 26965 bytes -2936 bytes (-9.82%)
Brotli (Wikipedia) brotli brotli -q 11 28023 bytes -1878 bytes (-6.28%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 28654 bytes -1247 bytes (-4.17%)
LZMA2 (Wikipedia) xz xz -9 29200 bytes -701 bytes (-2.34%)
Zstandard (Wikipedia) zstd zstd -19 29486 bytes -415 bytes (-1.39%)

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 2022.
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.