Currently best Zopfli settings

Save 1492 bytes by using my AngularJS 1.3.1 Zopfli version instead of the best available CDN (3.41% smaller than Yandex, 43793 vs. 45285 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 --i100000 --mb8 --mls32768 --bsr23 --lazy --ohh

(found November 30, 2015)

Description	Value	Parameter
iterations	100000	--i100000
maximum blocks	8	--mb8
maximum length score	32768	--mls32768
block splitting recursion	23	--bsr23
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 (43792 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://code.angularjs.org/1.3.1/angular.min.js --location | md5sum
4461ff2abe090919241058cc720784d3  -
curl --silent --compressed https://minime.stephan-brumme.com/files/angularjs/angular-1.3.1.min.zopfli.js.gz | md5sum
4461ff2abe090919241058cc720784d3  -

SHA1:
curl --silent --compressed https://code.angularjs.org/1.3.1/angular.min.js --location | sha1sum
b0546e0f6c2f40b3fecb42aad777540ab55c2595  -
curl --silent --compressed https://minime.stephan-brumme.com/files/angularjs/angular-1.3.1.min.zopfli.js.gz | sha1sum
b0546e0f6c2f40b3fecb42aad777540ab55c2595  -

These CDNs send you the original file:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	51962 bytes	4461ff2abe090919241058cc720784d3	March 18, 2015 @ 10:56
unpkg	50414 bytes	4461ff2abe090919241058cc720784d3	July 11, 2016 @ 15:54
cdnjs	45653 bytes	4461ff2abe090919241058cc720784d3	December 18, 2014 @ 18:15
Google	45297 bytes	4461ff2abe090919241058cc720784d3	October 31, 2014 @ 19:20
Yandex	45285 bytes	4461ff2abe090919241058cc720784d3	June 11, 2015 @ 14:17

And some CDNs send you a different file:

CDN	Size (compressed)	MD5 (uncompressed)	Comment / Diff	Timestamp
jsdelivr	51830 bytes	a8cb0e381723a7a9c946d35795651769	< AngularJS v1.3.1 > AngularJS v1.3.17 < (function(N,U,t){'use strict';function w(b){return functio [...] < ka&&a?!0:J(b)||H(b)||0===a||"number"===typeof a&&0<a&&a-1 [...] < b[d[e]],d[e]);return d}function jc(b){return function(a,c) [...] < function x(b){return"undefined"===typeof b}function z(b){r [...] < !(b.nodeName||b.prop&&b.attr&&b.find))}function Ed(b){var [...] < d.push(e)),a.push(e);else{var g=a.$$hashKey;H(a)?a.length= [...] < a||{},b)if("$"!==c.charAt(0)||"$"!==c.charAt(1))a[c]=b[c]; [...] < !A(b[d])){if(!la(b[d],a[d]))return!1;c[d]=!0}for(d in a)if [...] [...]	July 11, 2015 @ 17:50
Baidu	45768 bytes	552eaae40a6732736b1383c89bdef586	only whitespaces differ	April 3, 2015 @ 04:57

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

Other Versions

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

1.8.2, 1.8.1, 1.8.0,
1.7.9, 1.7.8, 1.7.7, 1.7.6, 1.7.5, 1.7.4, 1.7.3, 1.7.2, 1.7.1, 1.7.0,
1.6.10, 1.6.9, 1.6.8, 1.6.7, 1.6.6, 1.6.5, 1.6.4, 1.6.3, 1.6.2, 1.6.1, 1.6.0,
1.5.11, 1.5.10, 1.5.9, 1.5.8, 1.5.7, 1.5.6, 1.5.5, 1.5.4, 1.5.3, 1.5.2, 1.5.1, 1.5.0,
1.4.14, 1.4.13, 1.4.12, 1.4.11, 1.4.10, 1.4.9, 1.4.8, 1.4.7, 1.4.6, 1.4.5, 1.4.4, 1.4.3, 1.4.2, 1.4.1, 1.4.0,
1.3.20, 1.3.19, 1.3.18, 1.3.17, 1.3.16, 1.3.15, 1.3.14, 1.3.13, 1.3.12, 1.3.11, 1.3.10, 1.3.9, 1.3.8, 1.3.7, 1.3.6, 1.3.5, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0,
1.2.32, 1.2.31, 1.2.30, 1.2.29, 1.2.28, 1.2.27, 1.2.26, 1.2.25, 1.2.24, 1.2.23, 1.2.22, 1.2.21, 1.2.20, 1.2.19, 1.2.18, 1.2.17, 1.2.16, 1.2.15, 1.2.14, 1.2.13, 1.2.12, 1.2.11, 1.2.10, 1.2.9, 1.2.8, 1.2.7, 1.2.6, 1.2.5, 1.2.4, 1.2.3, 1.2.2, 1.2.1, 1.2.0,
1.1.5, 1.1.4, 1.1.3, 1.1.2, 1.1.1, 1.1.0,
1.0.8, 1.0.7, 1.0.6, 1.0.5, 1.0.4, 1.0.3, 1.0.2, 1.0.1, 1.0.0,
0.10.6, 0.10.5, 0.10.4, 0.10.3, 0.10.2, 0.10.1, 0.10.0,
0.9.19, 0.9.18, 0.9.17, 0.9.16, 0.9.15, 0.9.14, 0.9.13, 0.9.12, 0.9.11, 0.9.10, 0.9.9, 0.9.8, 0.9.7, 0.9.6, 0.9.5, 0.9.4, 0.9.3, 0.9.2, 0.9.1, 0.9.0

The project site contains an overview how well these versions were compressed.
Other interesting projects are BackboneJS, Bootstrap, D3, Dojo, Ember, jQuery, Knockout, lodash, React, Socket.IO, ThreeJS, UnderscoreJS and Vue.

Changelog

Best Zopfli parameters so far:

Size	Improvement	Parameters	Found
43793 bytes	-1 byte	zopfli --i100000 --mls32768 --bsr23 --lazy --ohh	November 30, 2015 @ 11:08
43794 bytes	-1 byte	zopfli --i100000 --mls1024 --bsr16 --lazy --ohh	November 30, 2015 @ 10:23
43795 bytes	-5 bytes	zopfli --i10000 --mls1024 --bsr16 --lazy --ohh	September 9, 2015 @ 07:04
43800 bytes	-3 bytes	zopfli --i1000 --mls1024 --bsr16 --lazy --ohh	September 7, 2015 @ 18:52
43803 bytes	-3 bytes	zopfli --i1000 --mls2048 --bsr16 --lazy --ohh	September 7, 2015 @ 18:52
43806 bytes	–	zopfli --i100 --mls1024 --bsr16 --lazy --ohh	September 7, 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 @ 12:47.

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 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	43837	43838	43840	43821	43841	43821	43828	43839	43835	43832	43830	43825	43826	43825	43824
4	43827	43830	43843	43838	43832	43833	43828	43825	43826	43831	43829	43828	43814	43811	43838
6	43820	43818	43846	43827	43836	43837	43811	43840	43817	43811	43815	43809	43815	43815	43817
7	43824	43825	43829	43829	43827	43837	43817	43808	43813	43809	43816	43813	43815	43809	43802
8	43834	43835	43828	43828	43838	43837	43837	43821	43815	43808	43811	43801	43815	43807	43838
9	43829	43840	43807	43827	43828	43810	43809	43837	43802	43808	43821	43811	43805	43808	43821
10	43829	43828	43829	43822	43828	43829	43829	43828	43816	43800	43811	43806	43805	43817	43809
11	43835	43825	43828	43830	43829	43837	43828	43826	43820	43804	43811	43806	43814	43806	43837
12	43835	43833	43832	43826	43823	43828	43830	43820	43821	43804	43828	43801	43815	43814	43811
13	43818	43833	43826	43823	43822	43828	43829	43821	43812	43810	43830	43808	43815	43811	43838
14	43841	43834	43833	43822	43813	43837	43811	43839	43819	43806	43819	43797	43814	43806	43810
15	43807	43812	43816	43818	43809	43837	43819	43807	43815	43798	43805	43800	43814	43817	43801
16	43827	43826	43837	43808	43804	43810	43810	43800	43816	43794	43799	43802	43814	43809	43801
17	43829	43842	43827	43822	43827	43828	43830	43837	43821	43797	43810	43801	43808	43809	43838
18	43828	43840	43827	43829	43827	43837	43828	43837	43822	43813	43812	43822	43814	43805	43828
19	43835	43833	43827	43811	43816	43813	43810	43828	43812	43808	43829	43830	43815	43798	43807
20	43818	43818	43817	43811	43811	43837	43830	43837	43815	43801	43814	43808	43814	43798	43798
21	43828	43810	43819	43823	43822	43837	43829	43828	43821	43808	43813	43811	43815	43804	43836
22	43807	43808	43808	43818	43810	43837	43811	43828	43819	43794	43824	43810	43814	43807	43809
23	43838	43833	43833	43828	43827	43827	43828	43821	43819	43802	43802	43806	43815	43804	43793
25	43826	43841	43828	43829	43828	43827	43829	43823	43812	43806	43803	43806	43815	43805	43836
30	43819	43809	43829	43829	43812	43821	43815	43840	43826	43802	43810	43802	43814	43817	43803
40	43835	43840	43831	43828	43829	43837	43812	43810	43812	43801	43809	43808	43808	43811	43836

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	43805 bytes	–	100%
1,000	43799 bytes	-6 bytes	100%
10,000	43795 bytes	-4 bytes	100%
100,000	43793 bytes	-2 bytes	0.87%
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)	43893 bytes	+100 bytes (+0.23%)	+4 bytes
1	43889 bytes	+96 bytes (+0.22%)	–
2	43918 bytes	+125 bytes (+0.29%)	+29 bytes
3	43944 bytes	+151 bytes (+0.34%)	+55 bytes
4	43964 bytes	+171 bytes (+0.39%)	+75 bytes
5	43943 bytes	+150 bytes (+0.34%)	+54 bytes
6	43954 bytes	+161 bytes (+0.37%)	+65 bytes
7	43964 bytes	+171 bytes (+0.39%)	+75 bytes
8	44005 bytes	+212 bytes (+0.48%)	+116 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	34954 bytes	-8839 bytes (-20.18%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	36569 bytes	-7224 bytes (-16.50%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	38250 bytes	-5543 bytes (-12.66%)
Brotli (Wikipedia)	brotli	brotli -q 11	40220 bytes	-3573 bytes (-8.16%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	41037 bytes	-2756 bytes (-6.29%)
LZMA2 (Wikipedia)	xz	xz -9	41688 bytes	-2105 bytes (-4.81%)
Zstandard (Wikipedia)	zstd	zstd -19	42822 bytes	-971 bytes (-2.22%)

Detailled Analysis