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
  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 --i1000 --mb8 --mls1024 --bsr30 --lazy --ohh

(found January 3, 2023)
Description Value Parameter
iterations 1000  --i1000
maximum blocks 8  --mb8
maximum length score 1024  --mls1024
block splitting recursion 30  --bsr30
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-3.6.1.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
29900 bytes -1 byte zopfli --i1000 --mls1024 --bsr30 --lazy --ohh January 3, 2023 @ 18:42
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 January 4, 2023 @ 10:35.

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:
1,000 or 10,000.
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 29906 29906 29907 29907 29909 29919 29907 29907 29909 29909 29911 29911 29901 29901 29928
4 29932 29908 29934 29932 29936 29912 29927 29908 29901 29903 29904 29912 29902 29900 29926
6 29922 29909 29912 29913 29911 29911 29902 29910 29907 29902 29900 29902 29916 29911 29925
7 29914 29912 29912 29923 29910 29914 29913 29913 29901 29902 29915 29901 29901 29907 29918
8 29911 29913 29910 29910 29911 29913 29908 29907 29909 29909 29911 29901 29901 29907 29923
9 29933 29910 29932 29931 29911 29913 29927 29910 29901 29902 29901 29901 29902 29904 29929
10 29911 29911 29912 29911 29910 29913 29927 29909 29907 29902 29902 29901 29916 29904 29925
11 29911 29909 29910 29910 29911 29912 29911 29912 29901 29907 29911 29902 29901 29911 29924
12 29933 29912 29911 29912 29913 29913 29925 29908 29901 29906 29914 29901 29902 29908 29927
13 29932 29912 29909 29911 29914 29913 29926 29908 29901 29902 29911 29902 29900 29911 29924
14 29909 29912 29911 29910 29911 29911 29911 29901 29908 29902 29901 29901 29902 29904 29925
15 29910 29911 29911 29923 29912 29911 29901 29909 29901 29902 29901 29901 29902 29907 29924
16 29910 29910 29910 29910 29912 29911 29902 29908 29908 29902 29901 29901 29901 29918 29923
17 29911 29911 29910 29913 29912 29910 29927 29911 29901 29909 29902 29901 29901 29904 29923
18 29910 29909 29913 29914 29913 29911 29901 29908 29901 29902 29911 29901 29902 29918 29924
19 29910 29909 29909 29910 29911 29913 29908 29908 29901 29902 29913 29901 29901 29911 29922
20 29935 29910 29909 29935 29911 29911 29925 29912 29907 29902 29901 29901 29906 29917 29924
21 29909 29910 29911 29909 29908 29913 29926 29910 29908 29902 29902 29901 29902 29911 29925
22 29909 29911 29910 29910 29911 29915 29909 29911 29901 29901 29913 29902 29918 29910 29924
23 29912 29910 29913 29914 29911 29911 29910 29912 29901 29902 29914 29902 29901 29910 29923
25 29911 29912 29910 29912 29912 29913 29927 29910 29901 29902 29901 29901 29902 29907 29925
30 29910 29911 29909 29911 29912 29911 29927 29908 29901 29900 29901 29901 29901 29911 29929
40 29913 29910 29911 29911 29912 29911 29908 29901 29900 29902 29901 29901 29900 29910 29927

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 29900 bytes -1 byte 100%
10,000 29900 bytes – 1.45%
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 -4877 bytes (-16.31%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 25434 bytes -4466 bytes (-14.94%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 26965 bytes -2935 bytes (-9.82%)
Brotli (Wikipedia) brotli brotli -q 11 28023 bytes -1877 bytes (-6.28%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 28654 bytes -1246 bytes (-4.17%)
LZMA2 (Wikipedia) xz xz -9 29200 bytes -700 bytes (-2.34%)
Zstandard (Wikipedia) zstd zstd -19 29486 bytes -414 bytes (-1.38%)

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.