Ember 1.3.0 - as small as it gets (near-perfect GZIP compression)

Choose a version:

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
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
zultra	68313 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 (or via HTTPS)

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 4077 bytes by using my Ember 1.3.0 Zopfli version instead of the best available CDN (5.98% smaller than cdnjs, 68219 vs. 72296 bytes):

Download

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).

Download

Verify file integrity

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

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

SHA1:
curl --silent --compressed https://builds.emberjs.com/tags/v1.3.0/ember.min.js --location | sha1sum
77ff54eddd7937bcf91f668be1a589c3a42761d9 -
curl --silent --compressed https://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

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 July 20, 2020 @ 12:53.

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
2	68236	68236	68225	68225	68238	68223	68223	68222	68228	68229	68229	68234	68232	68233	68223
4	68224	68226	68237	68227	68232	68226	68229	68223	68224	68223	68222	68222	68232	68232	68233
6	68228	68225	68225	68226	68230	68227	68225	68223	68220	68222	68223	68226	68224	68239	68228
7	68225	68226	68225	68223	68228	68227	68230	68222	68220	68221	68220	68225	68228	68234	68228
8	68226	68227	68225	68226	68228	68227	68225	68223	68224	68223	68223	68230	68228	68234	68226
9	68234	68229	68231	68226	68229	68225	68223	68223	68228	68222	68227	68226	68234	68241	68230
10	68226	68225	68224	68226	68227	68228	68226	68224	68223	68222	68220	68225	68225	68232	68232
11	68226	68233	68225	68226	68230	68229	68228	68222	68220	68222	68220	68225	68231	68234	68226
12	68225	68229	68225	68229	68228	68228	68230	68223	68220	68219	68220	68227	68225	68230	68225
13	68226	68223	68231	68228	68228	68227	68230	68223	68220	68222	68220	68227	68225	68230	68225
14	68227	68225	68225	68228	68227	68228	68226	68224	68220	68224	68220	68223	68226	68239	68230
15	68226	68225	68225	68224	68228	68228	68230	68224	68222	68222	68222	68227	68227	68227	68233
16	68226	68229	68232	68227	68228	68228	68229	68222	68222	68222	68223	68228	68226	68230	68230
17	68225	68229	68226	68228	68229	68227	68227	68222	68222	68222	68220	68227	68227	68231	68225
18	68225	68223	68224	68226	68228	68224	68228	68223	68223	68223	68222	68226	68233	68240	68234
19	68225	68225	68225	68230	68229	68227	68229	68223	68222	68222	68220	68227	68232	68238	68229
20	68244	68226	68225	68223	68228	68227	68226	68223	68222	68219	68223	68225	68225	68231	68226
21	68251	68226	68224	68227	68228	68227	68230	68223	68223	68222	68220	68225	68225	68232	68225
22	68225	68228	68225	68227	68228	68228	68234	68223	68220	68222	68220	68227	68225	68241	68224
23	68225	68229	68226	68228	68228	68225	68230	68223	68222	68222	68220	68225	68225	68234	68224
25	68225	68227	68241	68227	68228	68227	68226	68223	68220	68223	68220	68224	68226	68231	68232
30	68224	68232	68224	68228	68228	68226	68227	68223	68222	68221	68220	68227	68227	68239	68229
40	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
(any)	68327 bytes	+108 bytes (+0.16%)	+26 bytes
1	68301 bytes	+82 bytes (+0.12%)	–
2	68321 bytes	+102 bytes (+0.15%)	+20 bytes
3	68361 bytes	+142 bytes (+0.21%)	+60 bytes
4	68411 bytes	+192 bytes (+0.28%)	+110 bytes
5	68432 bytes	+213 bytes (+0.31%)	+131 bytes
6	68408 bytes	+189 bytes (+0.28%)	+107 bytes
7	68436 bytes	+217 bytes (+0.32%)	+135 bytes
8	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.
However, support for Brotli is constantly growing - for example, your browser actually supports it !

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%)
Zstandard (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):

Load and Parse Data

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 2024.
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

All trademarks are property of their respective owners. You know, the boring legal stuff.