Choose a version:
29% The original file has 1438659 bytes (1,404.9k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 411416 bytes (401.8k, 29%).

After GZIP compression these minified files vary in size:
Boot
  132367 bytes (129.3k)
CDN
jsdelivr
  132367 bytes (129.3k)
CDN
Baidu
  108787 bytes (106.2k)
CDN
cdnjs
  108720 bytes (106.2k)
CDN
gzip -6 (default)
  107282 bytes (104.8k)
local copy
cdnhttps
  107149 bytes (104.6k)
CDN
gzip -9
  106967 bytes (104.5k)
local copy
7zip -mx=9 -tgzip
  103357 bytes (100.9k)
local copy
libdeflate -12
  103200 bytes (100.8k)
local copy
pigz -11 -n
  103138 bytes (100.7k)
local copy
kzip -s0 -rn -b0
  102940 bytes (100.5k)
local copy
Zopfli
  102907 bytes (100.5k)
local copy
Zopfli (defluff)
  102903 bytes (100.5k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-1.12.0.min.js

You will automatically get the smallest Ember 1.12.0 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 4242 bytes by using my Ember 1.12.0 Zopfli version instead of the best available CDN (4.12% smaller than cdnhttps, 102907 vs. 107149 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 --mls2048 --bsr9 --lazy --ohh

(found July 19, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 2048  --mls2048
block splitting recursion 9  --bsr9
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 4 more bytes (102903 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://builds.emberjs.com/tags/v1.12.0/ember.min.js --location | md5sum
4c005c94e38f86e5f04552fdf40edb56  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-1.12.0.min.zopfli.js.gz | md5sum
4c005c94e38f86e5f04552fdf40edb56  -

SHA1:
curl --silent --compressed http://builds.emberjs.com/tags/v1.12.0/ember.min.js --location | sha1sum
7afda33ee850a4e41b60146c8ca500e54a803a7e  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-1.12.0.min.zopfli.js.gz | sha1sum
7afda33ee850a4e41b60146c8ca500e54a803a7e  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 132367 bytes 4c005c94e38f86e5f04552fdf40edb56 May 27, 2015 @ 09:10
jsdelivr 132367 bytes 4c005c94e38f86e5f04552fdf40edb56 May 14, 2015 @ 05:06
cdnjs 108720 bytes 4c005c94e38f86e5f04552fdf40edb56 May 15, 2015 @ 12:00
cdnhttps 107149 bytes 4c005c94e38f86e5f04552fdf40edb56 December 24, 2015 @ 07:33

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
Baidu 108787 bytes b09e158e25e9df4f8a4262c158b6dcaa < "use strict";e["default"]=n["default"].extend({container:n [...]
< "use strict";function i(e,i,a,s,o,u,l,c){var h=n["default" [...]
< i.hasOwnProperty("chainWatchers")||(s=i.chainWatchers={}), [...]
< arguments[e]}return H.apply(this,arguments)}function q(){f [...]
< "use strict";function r(e,t,r,n){var i,a,s,o=n.data.view,u [...]
< var i=this.connections[n];i.outlet===e&&i.into===t&&(this. [...]
< return a.arrayChanged===o?u.contains(i)||n.addObject(i):n. [...]
< "use strict";function d(){return this}var f="Index out of [...]
> "use strict";e["default"]=n["default"].extend({container:n [...]
> "use strict";function i(e,i,a,s,o,u,l,c){var h=n["default" [...]
[...]
June 3, 2015 @ 07:58

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

Other Versions

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

3.0.0,
2.18.2, 2.18.1, 2.18.0,
2.17.2, 2.17.1, 2.17.0,
2.16.2, 2.16.1, 2.16.0,
2.15.3, 2.15.2, 2.15.1, 2.15.0,
2.14.1, 2.14.0,
2.13.4, 2.13.3, 2.13.2, 2.13.1, 2.13.0,
2.12.2, 2.12.1, 2.12.0,
2.11.3, 2.11.2, 2.11.1, 2.11.0,
2.10.2, 2.10.1, 2.10.0,
2.9.1, 2.9.0,
2.8.3, 2.8.2, 2.8.1, 2.8.0,
2.7.3, 2.7.2, 2.7.1, 2.7.0,
2.6.2, 2.6.1, 2.6.0,
2.5.1, 2.5.0,
2.4.6, 2.4.5, 2.4.4, 2.4.3, 2.4.2, 2.4.1, 2.4.0,
2.3.1, 2.3.0,
2.2.2, 2.2.1, 2.2.0,
2.1.2, 2.1.1, 2.1.0,
2.0.3, 2.0.2, 2.0.1, 2.0.0,
1.13.13, 1.13.12, 1.13.11, 1.13.10, 1.13.9, 1.13.8, 1.13.7, 1.13.6, 1.13.5, 1.13.4, 1.13.3, 1.13.2, 1.13.1, 1.13.0,
1.12.2, 1.12.1, 1.12.0,
1.11.4, 1.11.3, 1.11.2, 1.11.1, 1.11.0,
1.10.1, 1.10.0,
1.9.1, 1.9.0,
1.8.1, 1.8.0,
1.7.1, 1.7.0,
1.6.1, 1.6.0,
1.5.1, 1.5.0,
1.4.0,
1.3.2, 1.3.1, 1.3.0,
1.2.2, 1.2.1, 1.2.0,
1.0.1, 1.0.0

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

Changelog

Best Zopfli parameters so far:
Size Improvement Parameters Found
102907 bytes -2 bytes zopfli --i100000 --mls2048 --bsr9 --lazy --ohh July 19, 2016 @ 17:06
102909 bytes -2 bytes zopfli --i100000 --mls64 --bsr9 --lazy --ohh November 22, 2015 @ 15:52
102911 bytes -3 bytes zopfli --i10000 --mls128 --bsr19 --lazy --ohh September 30, 2015 @ 13:45
102914 bytes -7 bytes zopfli --i1000 --mls128 --bsr19 --lazy --ohh September 30, 2015 @ 13:21
102921 bytes -19 bytes zopfli --i1000 --mls32768 --bsr16 --lazy --ohh September 30, 2015 @ 11:30
102940 bytes -3 bytes zopfli --i1000 --mls32768 --bsr14 --lazy --ohh September 30, 2015 @ 11:28
102943 bytes zopfli --i100 --mls32768 --bsr14 --lazy --ohh September 30, 2015 @ 10:01

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

Most recent activity on March 26, 2017 @ 15:58.

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
102952 102953 102962 102952 102952 102952 102958 102962 102947 102954 102945 102953 102967 102983 102958
102918 102918 102917 102919 102918 102913 102914 102912 102912 102913 102915 102908 102914 102922 102913
102947 102957 102953 102948 102947 102948 102949 102948 102949 102918 102922 102956 102950 102955 102952
102914 102914 102917 102915 102915 102949 102914 102912 102913 102914 102951 102946 102957 102921 102919
102915 102915 102915 102914 102946 102939 102912 102912 102914 102913 102914 102916 102914 102923 102919
102943 102939 102917 102945 102935 102909 102915 102912 102914 102913 102907 102917 102914 102922 102917
102915 102915 102916 102916 102935 102913 102914 102912 102914 102913 102912 102914 102913 102922 102912
102948 102936 102936 102912 102959 102913 102912 102912 102914 102913 102914 102915 102914 102922 102920
102915 102917 102915 102917 102954 102913 102914 102912 102912 102913 102912 102927 102914 102921 102921
102915 102917 102916 102914 102938 102914 102914 102913 102912 102913 102913 102914 102914 102921 102913
102944 102937 102917 102915 102940 102913 102915 102913 102912 102913 102913 102914 102914 102921 102915
102915 102918 102917 102919 102941 102913 102914 102915 102912 102913 102913 102914 102913 102921 102919
102943 102937 102939 102938 102952 102914 102907 102914 102914 102913 102913 102915 102913 102922 102912
102913 102943 102915 102914 102956 102913 102913 102912 102914 102915 102913 102917 102917 102921 102912
102914 102916 102915 102915 102937 102913 102913 102913 102912 102913 102914 102914 102914 102921 102919
102945 102917 102917 102914 102941 102913 102908 102912 102913 102913 102913 102915 102913 102921 102925
102942 102956 102935 102917 102934 102913 102912 102913 102912 102913 102913 102914 102913 102921 102913
102940 102939 102935 102934 102934 102913 102913 102912 102912 102913 102913 102914 102914 102921 102919
102946 102917 102917 102936 102951 102913 102912 102912 102914 102939 102907 102914 102913 102922 102914
102945 102915 102920 102915 102937 102913 102913 102912 102914 102913 102913 102913 102913 102921 102913
102944 102938 102915 102915 102946 102913 102912 102912 102914 102914 102913 102914 102914 102921 102920
102916 102917 102917 102939 102915 102913 102912 102912 102913 102913 102913 102913 102914 102922 102925
102914 102914 102917 102915 102942 102914 102913 102913 102914 102913 102914 102914 102908 102921 102925

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 102943 bytes 100%
1,000 102914 bytes -29 bytes 100%
10,000 102911 bytes -3 bytes 100%
100,000 102907 bytes -4 bytes 2.03%
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
102940 bytes +33 bytes (+0.03%)
102947 bytes +40 bytes (+0.04%) +7 bytes
102978 bytes +71 bytes (+0.07%) +38 bytes
103027 bytes +120 bytes (+0.12%) +87 bytes
103069 bytes +162 bytes (+0.16%) +129 bytes
103048 bytes +141 bytes (+0.14%) +108 bytes
103071 bytes +164 bytes (+0.16%) +131 bytes
103058 bytes +151 bytes (+0.15%) +118 bytes
103098 bytes +191 bytes (+0.19%) +158 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 71056 bytes -31851 bytes (-30.95%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 75763 bytes -27144 bytes (-26.38%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 80776 bytes -22131 bytes (-21.51%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 86196 bytes -16711 bytes (-16.24%)
Brotli (Wikipedia) brotli brotli -q 11 90078 bytes -12829 bytes (-12.47%)
LZMA2 (Wikipedia) xz xz -9 92040 bytes -10867 bytes (-10.56%)
ZSTD (Wikipedia) zstd zstd -19 94666 bytes -8241 bytes (-8.01%)

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 2018.
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