Choose a version:
23% The original file has 1136121 bytes (1,109.5k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 263719 bytes (257.5k, 23%).

After GZIP compression these minified files vary in size:
Boot
  90091 bytes (88.0k)
CDN
jsdelivr
  90091 bytes (88.0k)
CDN
Baidu
  74805 bytes (73.1k)
CDN
cdnjs
  74783 bytes (73.0k)
CDN
gzip -6 (default)
  73788 bytes (72.1k)
local copy
cdnhttps
  73670 bytes (71.9k)
CDN
gzip -9
  73433 bytes (71.7k)
local copy
7zip -mx=9 -tgzip
  70848 bytes (69.2k)
local copy
pigz -11 -n
  70677 bytes (69.0k)
local copy
libdeflate -12
  70664 bytes (69.0k)
local copy
kzip -s0 -rn -b1
  70608 bytes (69.0k)
local copy
Zopfli
  70525 bytes (68.9k)
local copy
Zopfli (defluff)
  70523 bytes (68.9k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-1.4.0.min.js (or via HTTPS)

You will automatically get the smallest Ember 1.4.0 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 3145 bytes by using my Ember 1.4.0 Zopfli version instead of the best available CDN (4.46% smaller than cdnhttps, 70525 vs. 73670 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 --mls2 --bsr10 --lazy --ohh

(found November 21, 2015)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 2  --mls2
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 (70523 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://builds.emberjs.com/tags/v1.4.0/ember.min.js --location | md5sum
861112f5f69ace5d76d7a6d7db9b9724  -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-1.4.0.min.zopfli.js.gz | md5sum
861112f5f69ace5d76d7a6d7db9b9724  -

SHA1:
curl --silent --compressed https://builds.emberjs.com/tags/v1.4.0/ember.min.js --location | sha1sum
679e2502026967e7f501ffeb02b8f358bd9da5bb  -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-1.4.0.min.zopfli.js.gz | sha1sum
679e2502026967e7f501ffeb02b8f358bd9da5bb  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 90091 bytes 861112f5f69ace5d76d7a6d7db9b9724 March 19, 2015 @ 17:58
jsdelivr 90091 bytes 861112f5f69ace5d76d7a6d7db9b9724 August 7, 2014 @ 19:17
cdnjs 74783 bytes 861112f5f69ace5d76d7a6d7db9b9724 February 14, 2014 @ 23:15
cdnhttps 73670 bytes 861112f5f69ace5d76d7a6d7db9b9724 December 24, 2015 @ 07:33

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
Baidu 74805 bytes cbc55415c491d2f2cbce12d770708b3b only whitespaces differ June 5, 2014 @ 10:05

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
70525 bytes -5 bytes zopfli --i100000 --mls2 --bsr10 --lazy --ohh November 21, 2015 @ 09:48
70530 bytes -2 bytes zopfli --i10000 --mls2 --bsr10 --lazy --ohh September 23, 2015 @ 17:17
70532 bytes -1 byte zopfli --i1000 --mls2 --bsr10 --lazy --ohh September 23, 2015 @ 16:58
70533 bytes -3 bytes zopfli --i1000 --mls4096 --bsr4 --lazy --ohh September 11, 2015 @ 01:41
70536 bytes -1 byte zopfli --i1000 --mls2048 --bsr11 --lazy --ohh September 11, 2015 @ 01:34
70537 bytes -1 byte zopfli --i1000 --mls512 --bsr11 --lazy --ohh September 11, 2015 @ 01:29
70538 bytes -36 bytes zopfli --i1000 --mls512 --bsr8 --lazy --ohh September 11, 2015 @ 01:29
70574 bytes zopfli --i100 --mls1024 --bsr8 --lazy --ohh September 10, 2015 @ 13:52

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

Most recent activity on March 27, 2017 @ 23:37.

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
70547 70547 70533 70530 70533 70545 70529 70534 70536 70535 70535 70541 70544 70540 70541
70540 70536 70537 70542 70529 70536 70534 70530 70530 70529 70533 70532 70542 70551 70551
70534 70534 70538 70537 70537 70537 70532 70529 70530 70534 70530 70532 70537 70541 70541
70534 70534 70537 70536 70531 70535 70541 70534 70529 70532 70529 70530 70533 70542 70541
70535 70538 70536 70535 70537 70534 70541 70530 70531 70531 70534 70540 70532 70541 70541
70535 70556 70536 70537 70536 70537 70530 70529 70533 70538 70536 70536 70539 70551 70540
70525 70533 70537 70538 70532 70536 70538 70534 70529 70531 70529 70533 70534 70548 70541
70535 70533 70538 70536 70531 70540 70530 70534 70529 70534 70529 70534 70539 70540 70546
70533 70532 70538 70537 70530 70533 70540 70534 70531 70537 70529 70532 70534 70543 70543
70527 70532 70536 70537 70532 70535 70525 70534 70529 70533 70529 70533 70538 70545 70540
70536 70536 70537 70541 70529 70534 70532 70530 70529 70534 70529 70533 70538 70551 70540
70534 70535 70538 70536 70538 70538 70534 70534 70530 70534 70530 70533 70532 70538 70543
70535 70532 70538 70532 70531 70535 70533 70534 70529 70538 70529 70532 70537 70541 70543
70535 70533 70532 70534 70531 70535 70538 70530 70529 70532 70540 70540 70540 70550 70546
70535 70532 70536 70534 70528 70537 70540 70529 70530 70536 70529 70529 70535 70541 70541
70535 70532 70535 70533 70533 70534 70530 70529 70529 70530 70533 70533 70534 70551 70540
70535 70538 70556 70538 70538 70535 70535 70529 70529 70531 70529 70533 70536 70551 70548
70537 70537 70533 70536 70531 70539 70530 70534 70535 70534 70529 70532 70537 70545 70541
70535 70535 70534 70536 70531 70535 70530 70529 70532 70534 70529 70532 70535 70539 70538
70535 70536 70533 70536 70531 70535 70530 70534 70529 70530 70529 70532 70533 70541 70547
70538 70539 70537 70535 70536 70536 70536 70534 70532 70534 70529 70532 70536 70541 70542
70534 70534 70535 70536 70537 70536 70537 70535 70530 70533 70534 70533 70537 70550 70540
70537 70534 70538 70536 70531 70540 70530 70535 70529 70534 70529 70533 70536 70541 70541

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 70570 bytes 100%
1,000 70532 bytes -38 bytes 100%
10,000 70526 bytes -6 bytes 100%
100,000 70525 bytes -1 byte 1.16%
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
70658 bytes +133 bytes (+0.19%) +50 bytes
70608 bytes +83 bytes (+0.12%)
70655 bytes +130 bytes (+0.18%) +47 bytes
70668 bytes +143 bytes (+0.20%) +60 bytes
70709 bytes +184 bytes (+0.26%) +101 bytes
70687 bytes +162 bytes (+0.23%) +79 bytes
70726 bytes +201 bytes (+0.29%) +118 bytes
70751 bytes +226 bytes (+0.32%) +143 bytes
70812 bytes +287 bytes (+0.41%) +204 bytes

Non-DEFLATE Algorithms

Archivers based on completely different compression algorithms often produce superior results.
Unfortunately, browsers only support gzip compression at the moment.
However, support for Brotli is constantly growing - but your browser doesn't support it.
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 51151 bytes -19374 bytes (-27.47%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 54250 bytes -16275 bytes (-23.08%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 56338 bytes -14187 bytes (-20.12%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 61613 bytes -8912 bytes (-12.64%)
Brotli (Wikipedia) brotli brotli -q 11 62829 bytes -7696 bytes (-10.91%)
LZMA2 (Wikipedia) xz xz -9 64592 bytes -5933 bytes (-8.41%)
Zstandard (Wikipedia) zstd zstd -19 66402 bytes -4123 bytes (-5.85%)

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