Choose a version:
29% The original file has 1736613 bytes (1,695.9k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 501146 bytes (489.4k, 29%).

After GZIP compression these minified files vary in size:
Boot
  160085 bytes (156.3k)
CDN
cdnjs
  131718 bytes (128.6k)
CDN
gzip -6 (default)
  130012 bytes (127.0k)
local copy
gzip -9
  129511 bytes (126.5k)
local copy
7zip -mx=9 -tgzip
  124947 bytes (122.0k)
local copy
libdeflate -12
  124853 bytes (121.9k)
local copy
pigz -11 -n
  124804 bytes (121.9k)
local copy
kzip -s0 -rn -b2
  124683 bytes (121.8k)
local copy
Zopfli
  124629 bytes (121.7k)
local copy
Zopfli (defluff)
  124626 bytes (121.7k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-2.13.4.min.js

You will automatically get the smallest Ember 2.13.4 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 7089 bytes by using my Ember 2.13.4 Zopfli version instead of the best available CDN (5.69% smaller than cdnjs, 124629 vs. 131718 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 --mls2048 --bsr18 --lazy --ohh

(found July 11, 2017)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 2048  --mls2048
block splitting recursion 18  --bsr18
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 (124626 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://builds.emberjs.com/tags/v2.13.4/ember.min.js --location | md5sum
44f9ac5b98921ddd51473c9b6395b793  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.13.4.min.zopfli.js.gz | md5sum
44f9ac5b98921ddd51473c9b6395b793  -

SHA1:
curl --silent --compressed http://builds.emberjs.com/tags/v2.13.4/ember.min.js --location | sha1sum
8c02373a19084dc71880ba6191ec1f9adf1d2250  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-2.13.4.min.zopfli.js.gz | sha1sum
8c02373a19084dc71880ba6191ec1f9adf1d2250  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 160085 bytes 44f9ac5b98921ddd51473c9b6395b793 July 9, 2017 @ 04:32
cdnjs 131718 bytes 44f9ac5b98921ddd51473c9b6395b793 July 5, 2017 @ 18:33

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
124629 bytes -2 bytes zopfli --i1000000 --mls2048 --bsr18 --lazy --ohh July 11, 2017 @ 14:08
124631 bytes -2 bytes zopfli --i100000 --mls2 --bsr14 --lazy --ohh July 10, 2017 @ 21:17
124633 bytes -1 byte zopfli --i100000 --mls2048 --bsr18 --lazy --ohh July 10, 2017 @ 15:56
124634 bytes -3 bytes zopfli --i10000 --mls2048 --bsr18 --lazy --ohh July 8, 2017 @ 20:43
124637 bytes -1 byte zopfli --i10000 --mls2 --bsr14 --lazy --ohh July 8, 2017 @ 02:40
124638 bytes -2 bytes zopfli --i10000 --mls16 --bsr14 --lazy --ohh July 8, 2017 @ 02:29
124640 bytes -3 bytes zopfli --i10000 --mls1024 --bsr25 --lazy --ohh July 8, 2017 @ 02:08
124643 bytes -4 bytes zopfli --i10000 --mls128 --bsr18 --lazy --ohh July 8, 2017 @ 01:46
124647 bytes -2 bytes zopfli --i10000 --mls2 --bsr17 --lazy --ohh July 8, 2017 @ 01:35
124649 bytes -1 byte zopfli --i1000 --mls1024 --bsr25 --lazy --ohh July 7, 2017 @ 19:38
124650 bytes -9 bytes zopfli --i1000 --mls16 --bsr14 --lazy --ohh July 7, 2017 @ 19:01
124659 bytes -17 bytes zopfli --i1000 --mls8 --bsr9 --lazy --ohh July 7, 2017 @ 18:59
124676 bytes zopfli --i100 --mls16 --bsr14 --lazy --ohh July 7, 2017 @ 17:33

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

Most recent activity on July 12, 2017 @ 02:39.

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
124675 124670 124665 124663 124652 124655 124639 124670 124651 124652 124652 124657 124668 124650 124661
124658 124658 124650 124649 124643 124643 124653 124651 124643 124659 124643 124640 124654 124659 124656
124653 124657 124650 124645 124643 124643 124647 124654 124643 124658 124651 124664 124657 124658 124661
124657 124656 124679 124653 124653 124652 124657 124657 124642 124645 124643 124643 124664 124657 124651
124645 124646 124643 124652 124647 124653 124645 124644 124648 124651 124644 124644 124664 124647 124644
124675 124644 124647 124642 124643 124644 124658 124648 124639 124638 124655 124654 124647 124653 124645
124652 124654 124648 124652 124654 124650 124652 124648 124647 124634 124643 124651 124663 124663 124657
124642 124655 124651 124644 124646 124653 124648 124647 124641 124639 124639 124656 124653 124662 124648
124645 124653 124650 124653 124662 124656 124649 124647 124640 124648 124643 124648 124649 124653 124662
124642 124641 124649 124643 124647 124647 124649 124649 124646 124638 124645 124647 124649 124652 124646
124629 124639 124652 124638 124648 124651 124643 124648 124649 124646 124642 124642 124656 124662 124667
124648 124643 124642 124646 124648 124647 124649 124648 124644 124649 124649 124647 124656 124669 124650
124648 124652 124648 124647 124643 124649 124651 124648 124650 124653 124651 124648 124658 124662 124672
124647 124645 124641 124642 124650 124644 124648 124647 124640 124650 124648 124647 124658 124667 124662
124647 124646 124646 124645 124651 124651 124643 124646 124645 124675 124629 124648 124665 124664 124651
124641 124644 124640 124642 124648 124643 124642 124648 124647 124643 124642 124648 124653 124657 124660
124650 124645 124646 124651 124647 124647 124649 124650 124648 124650 124649 124654 124656 124663 124657
124645 124648 124647 124653 124648 124648 124650 124647 124647 124645 124644 124644 124658 124663 124649
124651 124644 124639 124644 124661 124644 124649 124650 124647 124645 124645 124648 124659 124657 124660
124648 124653 124653 124656 124646 124650 124650 124648 124647 124645 124648 124647 124653 124663 124655
124648 124645 124649 124646 124647 124644 124650 124648 124648 124640 124634 124642 124656 124663 124655
124638 124642 124640 124647 124650 124648 124648 124648 124646 124648 124648 124647 124658 124657 124651
124659 124666 124651 124644 124647 124643 124651 124650 124647 124645 124646 124642 124645 124659 124666

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 124676 bytes 100%
1,000 124649 bytes -27 bytes 100%
10,000 124634 bytes -15 bytes 100%
100,000 124631 bytes -3 bytes 1.16%
1,000,000 124629 bytes -2 bytes 0.58%
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
124685 bytes +56 bytes (+0.04%) +2 bytes
124701 bytes +72 bytes (+0.06%) +18 bytes
124683 bytes +54 bytes (+0.04%)
124710 bytes +81 bytes (+0.06%) +27 bytes
124747 bytes +118 bytes (+0.09%) +64 bytes
124798 bytes +169 bytes (+0.14%) +115 bytes
124828 bytes +199 bytes (+0.16%) +145 bytes
124839 bytes +210 bytes (+0.17%) +156 bytes
124865 bytes +236 bytes (+0.19%) +182 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 85431 bytes -39198 bytes (-31.45%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 92432 bytes -32197 bytes (-25.83%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 99877 bytes -24752 bytes (-19.86%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 106051 bytes -18578 bytes (-14.91%)
Brotli (Wikipedia) brotli brotli -q 11 108569 bytes -16060 bytes (-12.89%)
LZMA2 (Wikipedia) xz xz -9 110436 bytes -14193 bytes (-11.39%)
ZSTD (Wikipedia) zstd zstd -19 113608 bytes -11021 bytes (-8.84%)

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