Ember 1.2.1 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 1031730 bytes (1,007.5k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 248892 bytes (243.1k, 24%).

After GZIP compression these minified files vary in size:

Boot	84874 bytes (82.9k)	CDN
Baidu	70582 bytes (68.9k)	CDN
cdnjs	70562 bytes (68.9k)	CDN
gzip -6 (default)	69631 bytes (68.0k)	local copy
gzip -9	69286 bytes (67.7k)	local copy
7zip -mx=9 -tgzip	66832 bytes (65.3k)	local copy
pigz -11 -n	66633 bytes (65.1k)	local copy
libdeflate -12	66632 bytes (65.1k)	local copy
zultra	66621 bytes (65.1k)	local copy
kzip -s0 -rn -b1	66613 bytes (65.1k)	local copy
Zopfli	66526 bytes (65.0k)	local copy
Zopfli (defluff)	66525 bytes (65.0k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-1.2.1.min.js (or via HTTPS)

You will automatically get the smallest Ember 1.2.1 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 4036 bytes by using my Ember 1.2.1 Zopfli version instead of the best available CDN (6.07% smaller than cdnjs, 66526 vs. 70562 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 --i1000000 --mb8 --mls4096 --bsr23 --lazy --ohh

(found July 23, 2016)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	4096	--mls4096
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 1 more byte (66525 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/v1.2.1/ember.min.js --location | md5sum
0bc70ff0baf60d52cc037aef69354da1 -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-1.2.1.min.zopfli.js.gz | md5sum
0bc70ff0baf60d52cc037aef69354da1 -

SHA1:
curl --silent --compressed https://builds.emberjs.com/tags/v1.2.1/ember.min.js --location | sha1sum
ba99292c8972055b9bcc93c3d8ea8c4c9cb6fa05 -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-1.2.1.min.zopfli.js.gz | sha1sum
ba99292c8972055b9bcc93c3d8ea8c4c9cb6fa05 -

These CDNs send you the original file:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	84874 bytes	0bc70ff0baf60d52cc037aef69354da1	March 19, 2015 @ 17:49
cdnjs	70562 bytes	0bc70ff0baf60d52cc037aef69354da1	January 14, 2014 @ 20:15

And some CDNs send you a different file:

CDN	Size (compressed)	MD5 (uncompressed)	Comment / Diff	Timestamp
Baidu	70582 bytes	203435b3cfab0cf10279ffc523f3c9d2	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
66526 bytes	-3 bytes	zopfli --i1000000 --mls4096 --bsr23 --lazy --ohh	July 23, 2016 @ 23:41
66529 bytes	-1 byte	zopfli --i100000 --mls4096 --bsr23 --lazy --ohh	July 19, 2016 @ 19:10
66530 bytes	-1 byte	zopfli --i100000 --mls2 --bsr19 --lazy --ohh	November 22, 2015 @ 14:00
66531 bytes	-1 byte	zopfli --i1000000 --mls8 --bsr17 --lazy --ohh	November 21, 2015 @ 21:28
66532 bytes	-4 bytes	zopfli --i10000 --mls8 --bsr17 --lazy --ohh	October 2, 2015 @ 17:35
66536 bytes	-1 byte	zopfli --i1000 --mls8 --bsr17 --lazy --ohh	October 2, 2015 @ 16:23
66537 bytes	-1 byte	zopfli --i1000 --mls2 --bsr19 --lazy --ohh	October 2, 2015 @ 16:22
66538 bytes	-9 bytes	zopfli --i1000 --mls2 --bsr18 --lazy --ohh	October 2, 2015 @ 16:21
66547 bytes	-1 byte	zopfli --i1000 --mls8 --bsr2 --lazy --ohh	October 2, 2015 @ 16:16
66548 bytes	-2 bytes	zopfli --i1000 --mls256 --bsr17 --lazy --ohh	October 2, 2015 @ 16:12
66550 bytes	-3 bytes	zopfli --i1000 --mls64 --bsr18 --lazy --ohh	October 2, 2015 @ 16:07
66553 bytes	–	zopfli --i100 --mls64 --bsr18 --lazy --ohh	September 30, 2015 @ 10:58

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 @ 12:56.

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
2	66539	66539	66539	66539	66538	66536	66536	66536	66539	66537	66537	66536	66539	66539	66544
4	66540	66538	66538	66539	66533	66538	66534	66532	66534	66534	66535	66533	66537	66536	66543
6	66538	66538	66539	66534	66534	66533	66540	66535	66533	66534	66534	66534	66540	66537	66539
7	66542	66537	66538	66534	66538	66539	66541	66533	66533	66533	66534	66534	66538	66545	66537
8	66537	66538	66536	66535	66535	66539	66538	66535	66533	66533	66534	66534	66540	66549	66540
9	66537	66538	66534	66534	66535	66536	66542	66533	66534	66534	66534	66534	66535	66540	66546
10	66539	66539	66533	66533	66540	66538	66541	66533	66533	66534	66533	66534	66537	66547	66537
11	66536	66538	66536	66533	66537	66533	66539	66536	66533	66533	66534	66531	66537	66537	66541
12	66536	66537	66539	66533	66534	66538	66541	66538	66533	66534	66533	66529	66537	66545	66537
13	66536	66537	66538	66534	66535	66537	66541	66537	66533	66534	66534	66532	66540	66548	66537
14	66537	66536	66538	66535	66534	66540	66541	66535	66532	66534	66534	66534	66535	66541	66537
15	66536	66537	66537	66535	66534	66539	66541	66533	66531	66534	66534	66533	66536	66548	66540
16	66536	66536	66536	66533	66535	66537	66541	66537	66533	66534	66534	66535	66537	66545	66538
17	66538	66537	66531	66533	66534	66535	66541	66532	66533	66534	66532	66533	66537	66546	66538
18	66531	66537	66533	66533	66534	66535	66535	66533	66534	66534	66533	66531	66538	66545	66537
19	66530	66538	66539	66534	66538	66538	66540	66535	66531	66533	66534	66533	66536	66545	66535
20	66531	66537	66534	66535	66534	66539	66540	66534	66533	66534	66534	66534	66538	66545	66537
21	66537	66539	66534	66535	66534	66539	66540	66533	66532	66534	66534	66532	66537	66544	66541
22	66537	66537	66534	66535	66534	66539	66541	66533	66533	66534	66534	66534	66536	66545	66539
23	66537	66537	66538	66542	66534	66538	66541	66533	66535	66534	66533	66526	66537	66545	66540
25	66536	66535	66534	66533	66534	66537	66540	66538	66533	66534	66533	66534	66538	66545	66536
30	66535	66538	66536	66533	66537	66538	66540	66532	66533	66534	66534	66533	66536	66545	66537
40	66532	66537	66538	66535	66541	66538	66540	66538	66530	66534	66534	66534	66536	66545	66546

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	66553 bytes	–	100%
1,000	66536 bytes	-17 bytes	100%
10,000	66531 bytes	-5 bytes	100%
100,000	66529 bytes	-2 bytes	3.77%
1,000,000	66526 bytes	-3 bytes	1.16%
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)	66655 bytes	+129 bytes (+0.19%)	+42 bytes
1	66613 bytes	+87 bytes (+0.13%)	–
2	66656 bytes	+130 bytes (+0.20%)	+43 bytes
3	66668 bytes	+142 bytes (+0.21%)	+55 bytes
4	66658 bytes	+132 bytes (+0.20%)	+45 bytes
5	66707 bytes	+181 bytes (+0.27%)	+94 bytes
6	66727 bytes	+201 bytes (+0.30%)	+114 bytes
7	66772 bytes	+246 bytes (+0.37%)	+159 bytes
8	66782 bytes	+256 bytes (+0.38%)	+169 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	48344 bytes	-18182 bytes (-27.33%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	51208 bytes	-15318 bytes (-23.03%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	55082 bytes	-11444 bytes (-17.20%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	58225 bytes	-8301 bytes (-12.48%)
Brotli (Wikipedia)	brotli	brotli -q 11	59346 bytes	-7180 bytes (-10.79%)
LZMA2 (Wikipedia)	xz	xz -9	61088 bytes	-5438 bytes (-8.17%)
Zstandard (Wikipedia)	zstd	zstd -19	62682 bytes	-3844 bytes (-5.78%)

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.