Choose a version:
31% The original file has 287649 bytes (280.9k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 89493 bytes (87.4k, 31%).

After GZIP compression these minified files vary in size:
unpkg
  36310 bytes (35.5k)
CDN
cdnjs
  31151 bytes (30.4k)
CDN
Google
  31021 bytes (30.3k)
CDN
Microsoft
  30977 bytes (30.3k)
CDN
gzip -6 (default)
  30971 bytes (30.2k)
local copy
Boot
  30942 bytes (30.2k)
CDN
gzip -9
  30900 bytes (30.2k)
local copy
libdeflate -12
  29951 bytes (29.2k)
local copy
7zip -mx=9 -tgzip
  29948 bytes (29.2k)
local copy
zultra
  29870 bytes (29.2k)
local copy
kzip -s0 -rn -b2
  29846 bytes (29.1k)
local copy
pigz -11 -n
  29838 bytes (29.1k)
local copy
Zopfli
  29829 bytes (29.1k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-3.5.0.min.js (or via HTTPS)

You will automatically get the smallest jQuery 3.5.0 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 1113 bytes by using my jQuery 3.5.0 Zopfli version instead of the best available CDN (3.73% smaller than Boot, 29829 vs. 30942 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 --i10000 --mb8 --mls2048 --bsr8 --lazy --ohh

(found April 14, 2020)
Description Value Parameter
iterations 10000  --i10000
maximum blocks 8  --mb8
maximum length score 2048  --mls2048
block splitting recursion 8  --bsr8
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-3.5.0.min.js --location | md5sum
12108007906290015100837a6a61e9f4  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-3.5.0.min.zopfli.js.gz | md5sum
12108007906290015100837a6a61e9f4  -

SHA1:
curl --silent --compressed https://code.jquery.com/jquery-3.5.0.min.js --location | sha1sum
1d6ae46f2ffa213dede37a521b011ec1cd8d1ad3  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-3.5.0.min.zopfli.js.gz | sha1sum
1d6ae46f2ffa213dede37a521b011ec1cd8d1ad3  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
unpkg 36310 bytes 12108007906290015100837a6a61e9f4 (invalid)
cdnjs 31151 bytes 12108007906290015100837a6a61e9f4 April 10, 2020 @ 18:01
Google 31021 bytes 12108007906290015100837a6a61e9f4 May 8, 2020 @ 09:05
Microsoft 30977 bytes 12108007906290015100837a6a61e9f4 April 14, 2020 @ 17:26
Boot 30942 bytes 12108007906290015100837a6a61e9f4 April 10, 2020 @ 18:01

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

Other Versions

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

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
29829 bytes -2 bytes zopfli --i10000 --mls2048 --bsr8 --lazy --ohh April 14, 2020 @ 17:35
29831 bytes -1 byte zopfli --i10000 --mls512 --bsr10 --lazy --ohh April 14, 2020 @ 16:51
29832 bytes -1 byte zopfli --i1000 --mls4096 --bsr17 --lazy --ohh April 14, 2020 @ 15:53
29833 bytes -1 byte zopfli --i1000 --mls2048 --bsr14 --lazy --ohh April 14, 2020 @ 15:53
29834 bytes zopfli --i100 --mls2048 --bsr25 --lazy --ohh April 14, 2020 @ 15:21

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 @ 12:47.

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
29836 29835 29834 29844 29835 29832 29835 29836 29837 29836 29839 29833 29837 29832 29856
29834 29834 29835 29845 29860 29859 29830 29830 29832 29831 29833 29834 29832 29832 29858
29841 29858 29840 29839 29835 29841 29843 29840 29839 29833 29833 29833 29845 29841 29834
29838 29840 29844 29843 29844 29844 29843 29843 29830 29832 29844 29832 29832 29836 29854
29840 29841 29844 29840 29855 29837 29835 29836 29838 29836 29829 29834 29832 29838 29855
29858 29857 29859 29871 29858 29858 29832 29833 29832 29833 29833 29833 29833 29838 29855
29837 29836 29859 29838 29840 29857 29836 29836 29830 29832 29833 29832 29832 29836 29856
29838 29840 29839 29838 29841 29840 29832 29836 29832 29833 29833 29833 29832 29839 29854
29840 29859 29859 29861 29855 29857 29833 29837 29854 29833 29832 29834 29832 29838 29854
29840 29860 29860 29838 29841 29841 29832 29837 29832 29832 29837 29832 29835 29843 29853
29840 29841 29840 29839 29842 29857 29830 29836 29830 29832 29829 29834 29835 29842 29855
29839 29838 29840 29838 29839 29840 29833 29841 29832 29832 29833 29834 29833 29838 29853
29838 29841 29840 29838 29839 29860 29832 29834 29837 29839 29829 29834 29832 29839 29853
29840 29840 29840 29838 29837 29858 29833 29836 29832 29833 29833 29832 29832 29838 29853
29840 29839 29840 29838 29836 29838 29832 29835 29832 29838 29833 29833 29832 29838 29855
29857 29860 29859 29838 29836 29858 29832 29836 29832 29833 29843 29833 29835 29843 29853
29859 29860 29861 29839 29853 29858 29832 29837 29830 29839 29837 29832 29835 29839 29852
29843 29862 29840 29841 29841 29838 29830 29836 29832 29832 29832 29832 29833 29841 29855
29838 29838 29835 29837 29841 29838 29832 29836 29832 29833 29833 29832 29836 29841 29854
29841 29840 29840 29840 29840 29841 29832 29837 29832 29838 29843 29833 29836 29839 29855
29840 29840 29840 29839 29841 29831 29832 29836 29833 29832 29832 29832 29834 29838 29855
29836 29841 29840 29838 29841 29831 29832 29837 29832 29832 29833 29834 29835 29838 29854
29862 29860 29860 29839 29841 29839 29836 29833 29832 29833 29833 29833 29832 29840 29853

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 29834 bytes 100%
1,000 29832 bytes -2 bytes 100%
10,000 29829 bytes -3 bytes 100%
100,000 29829 bytes 4.06%
1,000,000 29829 bytes 0.87%
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
29922 bytes +93 bytes (+0.31%) +76 bytes
29922 bytes +93 bytes (+0.31%) +76 bytes
29846 bytes +17 bytes (+0.06%)
29857 bytes +28 bytes (+0.09%) +11 bytes
29881 bytes +52 bytes (+0.17%) +35 bytes
29903 bytes +74 bytes (+0.25%) +57 bytes
29934 bytes +105 bytes (+0.35%) +88 bytes
29979 bytes +150 bytes (+0.50%) +133 bytes
30027 bytes +198 bytes (+0.66%) +181 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 25010 bytes -4819 bytes (-16.16%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 25420 bytes -4409 bytes (-14.78%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 26969 bytes -2860 bytes (-9.59%)
Brotli (Wikipedia) brotli brotli -q 11 28016 bytes -1813 bytes (-6.08%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 28614 bytes -1215 bytes (-4.07%)
LZMA2 (Wikipedia) xz xz -9 29176 bytes -653 bytes (-2.19%)
Zstandard (Wikipedia) zstd zstd -19 29455 bytes -374 bytes (-1.25%)

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 2020.
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.