Choose a version:
23% The original file has 1095493 bytes (1,069.8k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 254468 bytes (248.5k, 23%).

After GZIP compression these minified files vary in size:
Boot
  87036 bytes (85.0k)
CDN
Baidu
  72316 bytes (70.6k)
CDN
cdnjs
  72296 bytes (70.6k)
CDN
gzip -6 (default)
  71317 bytes (69.6k)
local copy
cdnhttps
  71239 bytes (69.6k)
CDN
gzip -9
  70993 bytes (69.3k)
local copy
7zip -mx=9 -tgzip
  68528 bytes (66.9k)
local copy
pigz -11 -n
  68346 bytes (66.7k)
local copy
libdeflate -12
  68331 bytes (66.7k)
local copy
kzip -s0 -rn -b1
  68301 bytes (66.7k)
local copy
Zopfli
  68219 bytes (66.6k)
local copy
Zopfli (defluff)
  68217 bytes (66.6k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-1.3.0.min.js

You will automatically get the smallest Ember 1.3.0 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 3020 bytes by using my Ember 1.3.0 Zopfli version instead of the best available CDN (4.43% smaller than cdnhttps, 68219 vs. 71239 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 --mls1024 --bsr20 --lazy --ohh

(found March 28, 2017)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 1024  --mls1024
block splitting recursion 20  --bsr20
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 (68217 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://builds.emberjs.com/tags/v1.3.0/ember.min.js --location | md5sum
4bb29c3d4ce4b8eb8659779e81499021  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-1.3.0.min.zopfli.js.gz | md5sum
4bb29c3d4ce4b8eb8659779e81499021  -

SHA1:
curl --silent --compressed http://builds.emberjs.com/tags/v1.3.0/ember.min.js --location | sha1sum
77ff54eddd7937bcf91f668be1a589c3a42761d9  -
curl --silent --compressed http://minime.stephan-brumme.com/files/ember/ember-1.3.0.min.zopfli.js.gz | sha1sum
77ff54eddd7937bcf91f668be1a589c3a42761d9  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 87036 bytes 4bb29c3d4ce4b8eb8659779e81499021 March 19, 2015 @ 17:51
cdnjs 72296 bytes 4bb29c3d4ce4b8eb8659779e81499021 January 13, 2014 @ 19:17
cdnhttps 71239 bytes 4bb29c3d4ce4b8eb8659779e81499021 December 24, 2015 @ 07:33

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
Baidu 72316 bytes d6b62c6c93d344fa9859b4d5ccada93f 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
68219 bytes -1 byte zopfli --i100000 --mls1024 --bsr20 --lazy --ohh March 28, 2017 @ 00:32
68220 bytes -1 byte zopfli --i100000 --mls2048 --bsr25 --lazy --ohh November 21, 2015 @ 09:38
68221 bytes -1 byte zopfli --i10000 --mls2048 --bsr11 --lazy --ohh November 20, 2015 @ 22:29
68222 bytes -5 bytes zopfli --i10000 --mls2048 --bsr7 --lazy --ohh October 2, 2015 @ 14:24
68227 bytes -1 byte zopfli --i1000 --mls2048 --bsr7 --lazy --ohh October 2, 2015 @ 13:50
68228 bytes -1 byte zopfli --i1000 --mls2048 --bsr15 --lazy --ohh October 2, 2015 @ 13:11
68229 bytes -40 bytes zopfli --i1000 --mls128 --bsr2 --lazy --ohh October 2, 2015 @ 13:03
68269 bytes zopfli --i100 --mls128 --bsr2 --lazy --ohh September 30, 2015 @ 10:11

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 @ 10:37.

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
68236 68236 68225 68225 68238 68223 68223 68222 68228 68229 68229 68234 68232 68233 68223
68224 68226 68237 68227 68232 68226 68229 68223 68224 68223 68222 68222 68232 68232 68233
68228 68225 68225 68226 68230 68227 68225 68223 68220 68222 68223 68226 68224 68239 68228
68225 68226 68225 68223 68228 68227 68230 68222 68220 68221 68220 68225 68228 68234 68228
68226 68227 68225 68226 68228 68227 68225 68223 68224 68223 68223 68230 68228 68234 68226
68234 68229 68231 68226 68229 68225 68223 68223 68228 68222 68227 68226 68234 68241 68230
68226 68225 68224 68226 68227 68228 68226 68224 68223 68222 68220 68225 68225 68232 68232
68226 68233 68225 68226 68230 68229 68228 68222 68220 68222 68220 68225 68231 68234 68226
68225 68229 68225 68229 68228 68228 68230 68223 68220 68219 68220 68227 68225 68230 68225
68226 68223 68231 68228 68228 68227 68230 68223 68220 68222 68220 68227 68225 68230 68225
68227 68225 68225 68228 68227 68228 68226 68224 68220 68224 68220 68223 68226 68239 68230
68226 68225 68225 68224 68228 68228 68230 68224 68222 68222 68222 68227 68227 68227 68233
68226 68229 68232 68227 68228 68228 68229 68222 68222 68222 68223 68228 68226 68230 68230
68225 68229 68226 68228 68229 68227 68227 68222 68222 68222 68220 68227 68227 68231 68225
68225 68223 68224 68226 68228 68224 68228 68223 68223 68223 68222 68226 68233 68240 68234
68225 68225 68225 68230 68229 68227 68229 68223 68222 68222 68220 68227 68232 68238 68229
68244 68226 68225 68223 68228 68227 68226 68223 68222 68219 68223 68225 68225 68231 68226
68251 68226 68224 68227 68228 68227 68230 68223 68223 68222 68220 68225 68225 68232 68225
68225 68228 68225 68227 68228 68228 68234 68223 68220 68222 68220 68227 68225 68241 68224
68225 68229 68226 68228 68228 68225 68230 68223 68222 68222 68220 68225 68225 68234 68224
68225 68227 68241 68227 68228 68227 68226 68223 68220 68223 68220 68224 68226 68231 68232
68224 68232 68224 68228 68228 68226 68227 68223 68222 68221 68220 68227 68227 68239 68229
68225 68232 68225 68223 68228 68228 68229 68222 68220 68222 68220 68229 68231 68236 68226

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 68269 bytes 100%
1,000 68227 bytes -42 bytes 100%
10,000 68221 bytes -6 bytes 100%
100,000 68219 bytes -2 bytes 7.83%
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
68327 bytes +108 bytes (+0.16%) +26 bytes
68301 bytes +82 bytes (+0.12%)
68321 bytes +102 bytes (+0.15%) +20 bytes
68361 bytes +142 bytes (+0.21%) +60 bytes
68411 bytes +192 bytes (+0.28%) +110 bytes
68432 bytes +213 bytes (+0.31%) +131 bytes
68408 bytes +189 bytes (+0.28%) +107 bytes
68436 bytes +217 bytes (+0.32%) +135 bytes
68473 bytes +254 bytes (+0.37%) +172 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 49575 bytes -18644 bytes (-27.33%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 52566 bytes -15653 bytes (-22.95%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 56456 bytes -11763 bytes (-17.24%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 59800 bytes -8419 bytes (-12.34%)
Brotli (Wikipedia) brotli brotli -q 11 60857 bytes -7362 bytes (-10.79%)
LZMA2 (Wikipedia) xz xz -9 62584 bytes -5635 bytes (-8.26%)
ZSTD (Wikipedia) zstd zstd -19 64242 bytes -3977 bytes (-5.83%)

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