Choose a version:
14% The original file has 1134714 bytes (1,108.1k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 155092 bytes (151.5k, 14%).

After GZIP compression these minified files vary in size:
Boot
  62983 bytes (61.5k)
CDN, direct link
cdnjs
  55249 bytes (54.0k)
CDN, direct link
gzip -6 (default)
  54881 bytes (53.6k)
local copy
cdnhttps
  54877 bytes (53.6k)
CDN, direct link
unpkg
  54877 bytes (53.6k)
CDN, direct link
Google
  54823 bytes (53.5k)
CDN, direct link
gzip -9
  54771 bytes (53.5k)
local copy
7zip -mx=9 -tgzip
  53090 bytes (51.8k)
local copy
libdeflate -12
  53059 bytes (51.8k)
local copy
kzip -s0 -rn -b1
  53057 bytes (51.8k)
local copy
pigz -11 -n
  52979 bytes (51.7k)
local copy
Zopfli
  52923 bytes (51.7k)
local copy
Zopfli (defluff)
  52921 bytes (51.7k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/angularjs/angular-1.5.1.min.js

You will automatically get the smallest AngularJS 1.5.1 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

Save 1900 bytes by using my AngularJS 1.5.1 Zopfli version instead of the best available CDN (3.59% smaller than Google, 52923 vs. 54823 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 --mls4 --bsr10 --lazy --ohh

(found March 17, 2016)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 4  --mls4
block splitting recursion 10  --bsr10
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 2 more bytes (52921 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://code.angularjs.org/1.5.1/angular.min.js --location | md5sum
5f237a436935dfc447a0cabc84f9eb3d  -
curl --silent --compressed http://minime.stephan-brumme.com/files/angularjs/angular-1.5.1.min.zopfli.js.gz | md5sum
5f237a436935dfc447a0cabc84f9eb3d  -

SHA1:
curl --silent --compressed https://code.angularjs.org/1.5.1/angular.min.js --location | sha1sum
68bd9c1480a2f27027eda702d3eb562a27e31921  -
curl --silent --compressed http://minime.stephan-brumme.com/files/angularjs/angular-1.5.1.min.zopfli.js.gz | sha1sum
68bd9c1480a2f27027eda702d3eb562a27e31921  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 62983 bytes 5f237a436935dfc447a0cabc84f9eb3d May 3, 2016 @ 10:30
cdnjs 55249 bytes 5f237a436935dfc447a0cabc84f9eb3d March 19, 2016 @ 13:46
cdnhttps 54877 bytes 5f237a436935dfc447a0cabc84f9eb3d November 22, 2016 @ 16:29
unpkg 54877 bytes 5f237a436935dfc447a0cabc84f9eb3d July 11, 2016 @ 15:52
Google 54823 bytes 5f237a436935dfc447a0cabc84f9eb3d March 16, 2016 @ 20:07

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

Other Versions

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

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
52923 bytes -3 bytes zopfli --i1000000 --mls4 --bsr10 --lazy --ohh March 17, 2016 @ 23:51
52926 bytes -3 bytes zopfli --i100000 --mls4 --bsr10 --lazy --ohh March 17, 2016 @ 12:00
52929 bytes -4 bytes zopfli --i10000 --mls8 --bsr8 --lazy --ohh March 17, 2016 @ 10:25
52933 bytes -1 byte zopfli --i1000 --mls8 --bsr8 --lazy --ohh March 17, 2016 @ 10:15
52934 bytes -15 bytes zopfli --i1000 --mls4 --bsr10 --lazy --ohh March 17, 2016 @ 10:14
52949 bytes -5 bytes zopfli --i1000 --mls1024 --bsr14 --lazy --ohh March 17, 2016 @ 10:12
52954 bytes zopfli --i100 --mls1024 --bsr14 --lazy --ohh March 17, 2016 @ 10:07

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

Most recent activity on November 22, 2016 @ 16:29.

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
52986 52986 52985 52988 52988 52990 52990 52977 52973 52987 52988 52981 52987 52988 52987
52961 52948 52979 52961 52969 52963 52969 52962 52957 52969 52959 52972 52971 52960 52961
52953 52954 52954 52965 52963 52970 52958 52959 52970 52958 52962 52969 52964 52957 52956
52970 52971 52982 52977 52967 52971 52959 52964 52965 52959 52961 52977 52959 52960 52958
52954 52956 52927 52965 52947 52962 52966 52968 52957 52948 52960 52965 52977 52960 52962
52955 52955 52979 52975 52960 52963 52962 52968 52957 52946 52963 52958 52957 52958 52961
52956 52923 52938 52959 52960 52957 52964 52963 52959 52947 52953 52959 52962 52958 52962
52956 52956 52973 52970 52969 52956 52967 52965 52951 52954 52953 52958 52956 52957 52955
52955 52969 52981 52962 52964 52958 52965 52968 52958 52946 52953 52956 52960 52959 52958
52955 52955 52981 52961 52962 52956 52964 52963 52961 52947 52953 52958 52963 52960 52959
52961 52955 52964 52969 52965 52956 52963 52959 52957 52946 52968 52958 52963 52958 52961
52971 52971 52980 52961 52964 52956 52964 52964 52963 52952 52954 52960 52957 52961 52959
52971 52950 52979 52977 52968 52956 52965 52970 52967 52957 52959 52957 52962 52949 52958
52956 52956 52936 52965 52949 52957 52963 52968 52959 52947 52950 52959 52958 52957 52959
52971 52971 52948 52965 52955 52956 52964 52966 52957 52945 52959 52956 52958 52957 52961
52960 52975 52981 52982 52965 52958 52966 52963 52957 52950 52956 52958 52958 52957 52957
52955 52957 52935 52960 52965 52956 52963 52968 52957 52945 52959 52959 52958 52961 52961
52956 52956 52936 52961 52965 52956 52962 52964 52964 52947 52959 52959 52963 52960 52961
52970 52956 52934 52961 52953 52956 52962 52963 52957 52945 52952 52958 52960 52960 52957
52955 52956 52972 52966 52967 52957 52962 52968 52959 52946 52953 52959 52958 52957 52955
52956 52956 52956 52957 52952 52957 52963 52970 52957 52948 52956 52959 52962 52959 52950
52947 52945 52960 52956 52957 52957 52964 52969 52958 52958 52953 52956 52958 52941 52950
52946 52948 52969 52953 52949 52940 52943 52960 52961 52947 52964 52958 52959 52956 52958

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 52954 bytes 100%
1,000 52933 bytes -21 bytes 100%
10,000 52929 bytes -4 bytes 100%
100,000 52926 bytes -3 bytes 0.58%
1,000,000 52923 bytes -3 bytes 0.29%
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
53069 bytes +146 bytes (+0.28%) +12 bytes
53057 bytes +134 bytes (+0.25%)
53078 bytes +155 bytes (+0.29%) +21 bytes
53085 bytes +162 bytes (+0.31%) +28 bytes
53102 bytes +179 bytes (+0.34%) +45 bytes
53109 bytes +186 bytes (+0.35%) +52 bytes
53116 bytes +193 bytes (+0.36%) +59 bytes
53098 bytes +175 bytes (+0.33%) +41 bytes
53125 bytes +202 bytes (+0.38%) +68 bytes

Non-DEFLATE Algorithms

Archivers based on completely different compression algorithms often produce superior results.
Unfortunately, browsers only support gzip compression at the moment.
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 41029 bytes -11894 bytes (-22.47%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 43414 bytes -9509 bytes (-17.97%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 44792 bytes -8131 bytes (-15.36%)
Brotli (Wikipedia) brotli brotli -q 11 48097 bytes -4826 bytes (-9.12%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 48939 bytes -3984 bytes (-7.53%)
LZMA2 (Wikipedia) xz xz -9 49636 bytes -3287 bytes (-6.21%)
ZSTD (Wikipedia) zstd zstd -19 51095 bytes -1828 bytes (-3.45%)

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 2017.
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