Choose a version:
14% The original file has 791322 bytes (772.8k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 108376 bytes (105.8k, 14%).

After GZIP compression these minified files vary in size:
Boot
  45800 bytes (44.7k)
CDN, direct link
cdnjs
  40382 bytes (39.4k)
CDN, direct link
gzip -6 (default)
  40158 bytes (39.2k)
local copy
cdnhttps
  40133 bytes (39.2k)
CDN, direct link
unpkg
  40133 bytes (39.2k)
CDN, direct link
gzip -9
  40101 bytes (39.2k)
local copy
Google
  40088 bytes (39.1k)
CDN, direct link
7zip -mx=9 -tgzip
  38848 bytes (37.9k)
local copy
kzip -s0 -rn -b1
  38845 bytes (37.9k)
local copy
libdeflate -12
  38842 bytes (37.9k)
local copy
pigz -11 -n
  38811 bytes (37.9k)
local copy
Zopfli
  38765 bytes (37.9k)
local copy
Zopfli (defluff)
  38762 bytes (37.9k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/angularjs/angular-1.2.31.min.js

You will automatically get the smallest AngularJS 1.2.31 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 1323 bytes by using my AngularJS 1.2.31 Zopfli version instead of the best available CDN (3.41% smaller than Google, 38765 vs. 40088 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 --mls64 --bsr7 --lazy --ohh

(found October 13, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 64  --mls64
block splitting recursion 7  --bsr7
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 3 more bytes (38762 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://code.angularjs.org/1.2.31/angular.min.js --location | md5sum
24aca2331a4f8c42491607fd363bb084  -
curl --silent --compressed http://minime.stephan-brumme.com/files/angularjs/angular-1.2.31.min.zopfli.js.gz | md5sum
24aca2331a4f8c42491607fd363bb084  -

SHA1:
curl --silent --compressed https://code.angularjs.org/1.2.31/angular.min.js --location | sha1sum
86d229f33b624e863be20e3510af753d4462a9c7  -
curl --silent --compressed http://minime.stephan-brumme.com/files/angularjs/angular-1.2.31.min.zopfli.js.gz | sha1sum
86d229f33b624e863be20e3510af753d4462a9c7  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 45800 bytes 24aca2331a4f8c42491607fd363bb084 October 12, 2016 @ 16:11
cdnjs 40382 bytes 24aca2331a4f8c42491607fd363bb084 October 11, 2016 @ 20:02
cdnhttps 40133 bytes 24aca2331a4f8c42491607fd363bb084 November 22, 2016 @ 16:29
unpkg 40133 bytes 24aca2331a4f8c42491607fd363bb084 October 13, 2016 @ 10:55
Google 40088 bytes 24aca2331a4f8c42491607fd363bb084 November 22, 2016 @ 20:39

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

Other Versions

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

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
38765 bytes -2 bytes zopfli --i100000 --mls64 --bsr7 --lazy --ohh October 13, 2016 @ 13:45
38767 bytes -3 bytes zopfli --i10000 --mls64 --bsr7 --lazy --ohh October 13, 2016 @ 13:08
38770 bytes -13 bytes zopfli --i1000 --mls64 --bsr7 --lazy --ohh October 13, 2016 @ 12:34
38783 bytes zopfli --i100 --mls64 --bsr7 --lazy --ohh October 13, 2016 @ 11:23

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

Most recent activity on January 25, 2017 @ 15:23.

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
38780 38781 38779 38781 38780 38783 38782 38782 38788 38796 38786 38786 38788 38790 38779
38786 38784 38784 38785 38786 38786 38787 38787 38782 38778 38774 38785 38786 38786 38786
38779 38778 38778 38777 38777 38778 38777 38778 38778 38786 38778 38779 38779 38786 38787
38777 38777 38778 38777 38778 38765 38778 38776 38777 38776 38775 38785 38779 38786 38776
38778 38778 38778 38777 38777 38780 38777 38776 38777 38788 38777 38778 38779 38787 38776
38792 38792 38792 38786 38786 38778 38789 38777 38790 38790 38787 38785 38782 38787 38776
38803 38802 38793 38797 38795 38791 38794 38793 38778 38798 38799 38777 38778 38787 38785
38778 38778 38777 38777 38777 38778 38776 38776 38799 38800 38798 38803 38776 38787 38776
38778 38777 38778 38778 38777 38778 38776 38793 38789 38798 38800 38778 38780 38788 38778
38778 38779 38778 38777 38776 38778 38777 38777 38778 38786 38778 38786 38778 38786 38786
38778 38778 38777 38776 38778 38778 38777 38792 38793 38786 38791 38776 38778 38786 38776
38778 38778 38778 38777 38778 38778 38776 38776 38774 38787 38776 38786 38774 38787 38777
38782 38782 38797 38784 38792 38777 38776 38795 38780 38773 38787 38776 38778 38787 38802
38779 38778 38777 38776 38793 38791 38791 38799 38797 38799 38796 38802 38777 38787 38778
38777 38777 38777 38777 38779 38781 38776 38776 38777 38787 38778 38803 38778 38787 38776
38778 38778 38778 38777 38777 38778 38776 38776 38789 38786 38787 38776 38777 38787 38776
38778 38777 38778 38777 38778 38777 38776 38791 38774 38786 38786 38777 38777 38787 38778
38778 38778 38777 38778 38777 38777 38777 38790 38775 38786 38776 38776 38777 38787 38778
38778 38778 38778 38778 38778 38778 38776 38776 38777 38787 38777 38778 38778 38787 38778
38778 38778 38777 38777 38777 38778 38777 38777 38776 38787 38778 38777 38778 38784 38777
38778 38778 38778 38777 38777 38778 38776 38777 38789 38800 38798 38774 38778 38787 38778
38778 38777 38777 38777 38778 38777 38776 38793 38789 38790 38786 38776 38778 38786 38776
38777 38778 38777 38777 38777 38778 38776 38793 38794 38790 38788 38776 38777 38787 38778

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 38783 bytes 100%
1,000 38770 bytes -13 bytes 100%
10,000 38767 bytes -3 bytes 100%
100,000 38765 bytes -2 bytes 2.61%
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
38848 bytes +83 bytes (+0.21%) +3 bytes
38845 bytes +80 bytes (+0.21%)
38875 bytes +110 bytes (+0.28%) +30 bytes
38901 bytes +136 bytes (+0.35%) +56 bytes
38949 bytes +184 bytes (+0.47%) +104 bytes
38964 bytes +199 bytes (+0.51%) +119 bytes
38925 bytes +160 bytes (+0.41%) +80 bytes
38912 bytes +147 bytes (+0.38%) +67 bytes
38927 bytes +162 bytes (+0.42%) +82 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 31415 bytes -7350 bytes (-18.96%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 32640 bytes -6125 bytes (-15.80%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 34155 bytes -4610 bytes (-11.89%)
Brotli (Wikipedia) brotli brotli -q 11 35619 bytes -3146 bytes (-8.12%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 36527 bytes -2238 bytes (-5.77%)
LZMA2 (Wikipedia) xz xz -9 36984 bytes -1781 bytes (-4.59%)
ZSTD (Wikipedia) zstd zstd -19 37958 bytes -807 bytes (-2.08%)

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