Choose a version:
31% The original file has 288580 bytes (281.8k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 89501 bytes (87.4k, 31%).

After GZIP compression these minified files vary in size:
Microsoft
  39756 bytes (38.8k)
CDN
unpkg
  36273 bytes (35.4k)
CDN
Google
  31017 bytes (30.3k)
CDN
cdnjs
  31017 bytes (30.3k)
CDN
gzip -6 (default)
  30967 bytes (30.2k)
local copy
Boot
  30937 bytes (30.2k)
CDN
gzip -9
  30895 bytes (30.2k)
local copy
7zip -mx=9 -tgzip
  29944 bytes (29.2k)
local copy
libdeflate -12
  29903 bytes (29.2k)
local copy
zultra
  29856 bytes (29.2k)
local copy
pigz -11 -n
  29839 bytes (29.1k)
local copy
kzip -s0 -rn -b2
  29837 bytes (29.1k)
local copy
Zopfli
  29820 bytes (29.1k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-3.6.0.min.js (or via HTTPS)

You will automatically get the smallest jQuery 3.6.0 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

Save 1117 bytes by using my jQuery 3.6.0 Zopfli version instead of the best available CDN (3.75% smaller than Boot, 29820 vs. 30937 bytes):
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 --i1000000 --mb8 --mls8192 --bsr18 --lazy --ohh

(found March 15, 2021)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 8192  --mls8192
block splitting recursion 18  --bsr18
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-3.6.0.min.js --location | md5sum
8fb8fee4fcc3cc86ff6c724154c49c42  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-3.6.0.min.zopfli.js.gz | md5sum
8fb8fee4fcc3cc86ff6c724154c49c42  -

SHA1:
curl --silent --compressed https://code.jquery.com/jquery-3.6.0.min.js --location | sha1sum
b82d238d4e31fdf618bae8ac11a6c812c03dd0d4  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-3.6.0.min.zopfli.js.gz | sha1sum
b82d238d4e31fdf618bae8ac11a6c812c03dd0d4  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Microsoft 39756 bytes 8fb8fee4fcc3cc86ff6c724154c49c42 March 3, 2021 @ 23:36
unpkg 36273 bytes 8fb8fee4fcc3cc86ff6c724154c49c42 (invalid)
Google 31017 bytes 8fb8fee4fcc3cc86ff6c724154c49c42 March 10, 2021 @ 15:28
cdnjs 31017 bytes 8fb8fee4fcc3cc86ff6c724154c49c42 March 2, 2021 @ 19:58
Boot 30937 bytes 8fb8fee4fcc3cc86ff6c724154c49c42 March 2, 2021 @ 19:58

Note: only the MD5 hashes are shown to keep things simple.

Other Versions

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

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
29820 bytes -2 bytes zopfli --i1000000 --mls8192 --bsr18 --lazy --ohh March 15, 2021 @ 21:11
29822 bytes -1 byte zopfli --i100000 --mls128 --bsr22 --lazy --ohh March 15, 2021 @ 12:20
29823 bytes -1 byte zopfli --i10000 --mls128 --bsr22 --lazy --ohh March 12, 2021 @ 16:26
29824 bytes -1 byte zopfli --i1000 --mls128 --bsr21 --lazy --ohh March 12, 2021 @ 14:13
29825 bytes -1 byte zopfli --i1000 --mls2048 --bsr13 --lazy --ohh March 12, 2021 @ 14:11
29826 bytes -1 byte zopfli --i1000 --mls128 --bsr40 --lazy --ohh March 12, 2021 @ 14:08
29827 bytes zopfli --i100 --mls4096 --bsr7 --lazy --ohh March 12, 2021 @ 13:08

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

Most recent activity on March 16, 2021 @ 17:19.

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, 100,000 or 1,000,000.
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
29842 29838 29838 29829 29838 29848 29830 29828 29829 29830 29832 29833 29829 29837 29850
29858 29860 29829 29859 29828 29849 29851 29826 29825 29826 29834 29827 29826 29825 29846
29832 29830 29836 29833 29836 29828 29848 29833 29846 29835 29836 29825 29837 29837 29846
29830 29834 29833 29833 29836 29835 29835 29834 29827 29834 29834 29826 29820 29827 29846
29832 29830 29831 29831 29833 29834 29831 29828 29829 29830 29832 29825 29826 29826 29849
29833 29832 29849 29852 29851 29835 29847 29828 29827 29830 29834 29836 29825 29827 29844
29836 29831 29832 29831 29833 29832 29830 29828 29830 29833 29826 29828 29832 29827 29844
29833 29832 29831 29831 29831 29834 29847 29828 29829 29830 29834 29825 29820 29836 29844
29832 29830 29835 29831 29833 29833 29848 29829 29829 29829 29824 29827 29826 29834 29844
29833 29831 29830 29832 29833 29832 29848 29829 29846 29825 29823 29827 29827 29832 29845
29834 29830 29830 29831 29830 29835 29847 29829 29829 29831 29835 29826 29820 29830 29844
29831 29831 29830 29832 29831 29830 29825 29830 29827 29827 29834 29826 29825 29829 29844
29833 29830 29830 29831 29833 29834 29848 29832 29829 29830 29835 29825 29820 29827 29844
29829 29833 29832 29832 29831 29848 29849 29833 29829 29830 29835 29825 29820 29830 29844
29831 29832 29832 29833 29833 29832 29823 29827 29827 29835 29835 29825 29820 29830 29848
29828 29832 29830 29830 29831 29833 29846 29829 29827 29831 29835 29827 29820 29828 29844
29830 29852 29851 29830 29852 29835 29833 29827 29827 29830 29835 29827 29826 29829 29845
29837 29831 29830 29831 29831 29832 29821 29830 29828 29830 29824 29828 29820 29829 29844
29829 29833 29832 29832 29833 29834 29822 29830 29827 29831 29826 29825 29825 29830 29845
29829 29832 29830 29834 29833 29835 29846 29833 29827 29833 29835 29826 29820 29830 29844
29834 29830 29829 29832 29833 29833 29832 29831 29826 29831 29826 29825 29820 29830 29844
29829 29832 29832 29832 29833 29834 29848 29834 29829 29831 29826 29826 29820 29827 29844
29832 29831 29850 29831 29833 29834 29823 29830 29827 29831 29834 29825 29827 29835 29845

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 29827 bytes 100%
1,000 29824 bytes -3 bytes 100%
10,000 29823 bytes -1 byte 100%
100,000 29822 bytes -1 byte 5.22%
1,000,000 29820 bytes -2 bytes 3.77%
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
29916 bytes +96 bytes (+0.32%) +79 bytes
29915 bytes +95 bytes (+0.32%) +78 bytes
29837 bytes +17 bytes (+0.06%)
29851 bytes +31 bytes (+0.10%) +14 bytes
29873 bytes +53 bytes (+0.18%) +36 bytes
29890 bytes +70 bytes (+0.23%) +53 bytes
29927 bytes +107 bytes (+0.36%) +90 bytes
29972 bytes +152 bytes (+0.51%) +135 bytes
30021 bytes +201 bytes (+0.67%) +184 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
ZPAQ (Wikipedia) zpaq zpaq -method 69 24998 bytes -4822 bytes (-16.17%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 25398 bytes -4422 bytes (-14.83%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 26940 bytes -2880 bytes (-9.66%)
Brotli (Wikipedia) brotli brotli -q 11 27975 bytes -1845 bytes (-6.19%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 28622 bytes -1198 bytes (-4.02%)
LZMA2 (Wikipedia) xz xz -9 29180 bytes -640 bytes (-2.15%)
Zstandard (Wikipedia) zstd zstd -19 29454 bytes -366 bytes (-1.23%)

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 2021.
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.