Choose a version:
29% The original file has 1443134 bytes (1,409.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 411645 bytes (402.0k, 29%).

After GZIP compression these minified files vary in size:
Boot
  132438 bytes (129.3k)
CDN, direct link
cdnjs
  108791 bytes (106.2k)
CDN, direct link
gzip -6 (default)
  107354 bytes (104.8k)
local copy
cdnhttps
  107217 bytes (104.7k)
CDN, direct link
gzip -9
  107032 bytes (104.5k)
local copy
7zip -mx=9 -tgzip
  103393 bytes (101.0k)
local copy
libdeflate -12
  103221 bytes (100.8k)
local copy
pigz -11 -n
  103180 bytes (100.8k)
local copy
kzip -s0 -rn -b1
  102990 bytes (100.6k)
local copy
Zopfli
  102959 bytes (100.5k)
local copy
Zopfli (defluff)
  102956 bytes (100.5k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-1.12.1.min.js

You will automatically get the smallest Ember 1.12.1 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 4258 bytes by using my Ember 1.12.1 Zopfli version instead of the best available CDN (4.14% smaller than cdnhttps, 102959 vs. 107217 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 --bsr23 --lazy --ohh

(found March 28, 2017)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 2048  --mls2048
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 3 more bytes (102956 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://builds.emberjs.com/tags/v1.12.1/ember.min.js --location | md5sum
a99e1fd746a1313002469d6a509f6eab  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-1.12.1.min.zopfli.js.gz | md5sum
a99e1fd746a1313002469d6a509f6eab  -

SHA1:
curl --silent --compressed http://builds.emberjs.com/tags/v1.12.1/ember.min.js --location | sha1sum
dbf66b9ca64fcdbbc51b9e5807befd28b4e8244e  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-1.12.1.min.zopfli.js.gz | sha1sum
dbf66b9ca64fcdbbc51b9e5807befd28b4e8244e  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 132438 bytes a99e1fd746a1313002469d6a509f6eab June 2, 2015 @ 00:58
cdnjs 108791 bytes a99e1fd746a1313002469d6a509f6eab June 1, 2015 @ 09:30
cdnhttps 107217 bytes a99e1fd746a1313002469d6a509f6eab December 24, 2015 @ 07:33

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

Other Versions

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

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
102959 bytes -1 byte zopfli --i100000 --mls2048 --bsr23 --lazy --ohh March 28, 2017 @ 06:41
102960 bytes -1 byte zopfli --i100000 --mls8192 --bsr20 --lazy --ohh March 25, 2017 @ 23:38
102961 bytes -1 byte zopfli --i100000 --mls1024 --bsr11 --lazy --ohh July 21, 2016 @ 23:25
102962 bytes -4 bytes zopfli --i100000 --mls2048 --bsr19 --lazy --ohh July 21, 2016 @ 19:31
102966 bytes -2 bytes zopfli --i10000 --mls1024 --bsr4 --lazy --ohh October 14, 2015 @ 08:00
102968 bytes -1 byte zopfli --i1000 --mls1024 --bsr11 --lazy --ohh September 10, 2015 @ 20:43
102969 bytes -8 bytes zopfli --i1000 --mls1024 --bsr4 --lazy --ohh September 10, 2015 @ 20:41
102977 bytes -17 bytes zopfli --i1000 --mls1024 --bsr8 --lazy --ohh September 10, 2015 @ 20:37
102994 bytes -1 byte zopfli --i1000 --mls512 --bsr16 --lazy --ohh September 10, 2015 @ 20:35
102995 bytes -7 bytes zopfli --i1000 --mls512 --bsr8 --lazy --ohh September 10, 2015 @ 20:23
103002 bytes zopfli --i100 --mls4096 --bsr13 --lazy --ohh September 10, 2015 @ 14:02

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

Most recent activity on March 28, 2017 @ 19:30.

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
103003 103009 103007 103013 103008 103009 103002 103006 103001 103006 103003 103008 102999 103033 103011
102965 102972 102977 102973 102973 102964 102964 102965 102967 102962 102966 102964 102972 102973 102972
103002 103003 103005 103001 103000 103003 102999 103023 102999 102968 102997 103013 103002 103011 103005
102968 102968 102965 102966 102972 103007 102962 102966 102965 102964 102998 102996 103012 102974 102974
102971 102969 102967 102970 102994 102966 102964 102965 102967 102965 102965 102964 102973 102974 102964
102992 102969 102976 103003 102999 102964 102964 102964 102967 102964 102964 102966 102973 102974 102974
102969 102969 102972 102972 102995 102964 102964 102965 102967 102964 102965 102964 102975 102972 102964
103001 102990 102996 102968 103006 102964 102964 102964 102965 102961 102966 102964 102973 102975 102969
102968 102968 102965 102971 102992 102966 102964 102965 102966 102964 102965 102970 102973 102975 102973
102969 102965 102969 102970 102990 102966 102964 102965 102965 102964 102964 102964 102973 102974 102973
102991 102990 102969 102970 103002 102964 102964 102965 102959 102964 102964 102965 102973 102974 102974
102968 102968 102965 102969 102989 102964 102964 102966 102967 102964 102964 102964 102974 102975 102974
102991 102992 102992 102965 102991 102964 102964 102965 102965 102964 102965 102967 102964 102974 102964
102968 102969 102969 102968 103002 102964 102964 102965 103037 102964 102964 102964 102976 102975 102974
102975 102965 102974 102971 103000 102964 102964 102964 102966 102964 102964 102964 102964 102974 102974
102992 102969 102968 102971 102992 102966 102964 102965 102967 102964 102962 102965 102964 102974 102974
102997 102991 102971 102992 102994 102964 102964 102964 102967 102964 102964 102964 102960 102974 102974
102991 102991 102992 102991 102996 102966 102967 102964 102959 102964 102959 102964 102965 102976 102969
102992 102967 102969 102976 102990 102964 102964 102965 102964 102966 102964 102964 102960 102974 102965
102990 102968 102965 102970 102968 102964 102964 102964 102959 102974 102959 102964 102965 102974 102973
102992 102968 102969 102970 102990 102964 102964 102964 102964 102964 102964 102964 102973 102974 102965
102964 102969 102972 102968 102968 102965 102964 102964 102965 102964 102965 102964 102964 102975 102964
102968 102968 102972 102971 102996 102966 102964 102965 102967 102964 102964 102964 102964 102974 102975

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 102995 bytes 100%
1,000 102968 bytes -27 bytes 100%
10,000 102963 bytes -5 bytes 100%
100,000 102959 bytes -4 bytes 3.77%
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
102990 bytes +31 bytes (+0.03%)
102990 bytes +31 bytes (+0.03%)
103033 bytes +74 bytes (+0.07%) +43 bytes
103072 bytes +113 bytes (+0.11%) +82 bytes
103110 bytes +151 bytes (+0.15%) +120 bytes
103092 bytes +133 bytes (+0.13%) +102 bytes
103120 bytes +161 bytes (+0.16%) +130 bytes
103114 bytes +155 bytes (+0.15%) +124 bytes
103156 bytes +197 bytes (+0.19%) +166 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 71068 bytes -31891 bytes (-30.97%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 75781 bytes -27178 bytes (-26.40%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 80802 bytes -22157 bytes (-21.52%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 86113 bytes -16846 bytes (-16.36%)
Brotli (Wikipedia) brotli brotli -q 11 90114 bytes -12845 bytes (-12.48%)
LZMA2 (Wikipedia) xz xz -9 92048 bytes -10911 bytes (-10.60%)
ZSTD (Wikipedia) zstd zstd -19 94682 bytes -8277 bytes (-8.04%)

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