Ember 1.2.0 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 1031435 bytes (1,007.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 248786 bytes (243.0k, 24%).

After GZIP compression these minified files vary in size:

Boot	84828 bytes (82.8k)	CDN
jsdelivr	84828 bytes (82.8k)	CDN
Baidu	70554 bytes (68.9k)	CDN
cdnjs	70533 bytes (68.9k)	CDN
gzip -6 (default)	69605 bytes (68.0k)	local copy
gzip -9	69256 bytes (67.6k)	local copy
7zip -mx=9 -tgzip	66813 bytes (65.2k)	local copy
libdeflate -12	66632 bytes (65.1k)	local copy
pigz -11 -n	66618 bytes (65.1k)	local copy
zultra	66596 bytes (65.0k)	local copy
kzip -s0 -rn -b1	66590 bytes (65.0k)	local copy
Zopfli	66504 bytes (64.9k)	local copy
Zopfli (defluff)	66502 bytes (64.9k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/ember/ember-1.2.0.min.js (or via HTTPS)

You will automatically get the smallest Ember 1.2.0 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 4029 bytes by using my Ember 1.2.0 Zopfli version instead of the best available CDN (6.06% smaller than cdnjs, 66504 vs. 70533 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 --mls4096 --bsr18 --lazy --ohh

(found March 26, 2017)

Description	Value	Parameter
iterations	100000	--i100000
maximum blocks	8	--mb8
maximum length score	4096	--mls4096
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 2 more bytes (66502 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/v1.2.0/ember.min.js --location | md5sum
61f82df6fff26622c6607c539f729a67 -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-1.2.0.min.zopfli.js.gz | md5sum
61f82df6fff26622c6607c539f729a67 -

SHA1:
curl --silent --compressed https://builds.emberjs.com/tags/v1.2.0/ember.min.js --location | sha1sum
793ecd7788f4c7732fda579b43f9af28b4e26080 -
curl --silent --compressed https://minime.stephan-brumme.com/files/ember/ember-1.2.0.min.zopfli.js.gz | sha1sum
793ecd7788f4c7732fda579b43f9af28b4e26080 -

These CDNs send you the original file:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	84828 bytes	61f82df6fff26622c6607c539f729a67	March 19, 2015 @ 17:45
jsdelivr	84828 bytes	61f82df6fff26622c6607c539f729a67	August 7, 2014 @ 19:17
cdnjs	70533 bytes	61f82df6fff26622c6607c539f729a67	January 13, 2014 @ 19:17

And some CDNs send you a different file:

CDN	Size (compressed)	MD5 (uncompressed)	Comment / Diff	Timestamp
Baidu	70554 bytes	4f75101a97d9f1496bc4eda12f49b857	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
66504 bytes	-1 byte	zopfli --i100000 --mls4096 --bsr18 --lazy --ohh	March 26, 2017 @ 22:31
66505 bytes	-1 byte	zopfli --i100000 --mls4096 --bsr12 --lazy --ohh	July 23, 2016 @ 02:25
66506 bytes	-1 byte	zopfli --i100000 --mls2 --bsr40 --lazy --ohh	November 21, 2015 @ 09:31
66507 bytes	-6 bytes	zopfli --i10000 --mls2 --bsr19 --lazy --ohh	October 2, 2015 @ 19:47
66513 bytes	-1 byte	zopfli --i1000 --mls2 --bsr19 --lazy --ohh	October 2, 2015 @ 19:21
66514 bytes	-18 bytes	zopfli --i1000 --mls512 --bsr18 --lazy --ohh	October 2, 2015 @ 18:49
66532 bytes	–	zopfli --i100 --mls512 --bsr18 --lazy --ohh	September 30, 2015 @ 09:08

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 @ 12:50.

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	66515	66517	66512	66512	66514	66511	66510	66511	66512	66513	66512	66513	66516	66515	66518
4	66516	66515	66513	66516	66507	66512	66508	66509	66509	66510	66509	66507	66511	66515	66515
6	66513	66513	66513	66509	66509	66511	66515	66508	66509	66509	66509	66508	66512	66511	66514
7	66516	66514	66515	66509	66515	66514	66514	66508	66509	66507	66509	66509	66513	66521	66513
8	66513	66512	66511	66514	66513	66515	66515	66512	66510	66511	66511	66508	66513	66524	66513
9	66513	66512	66509	66509	66513	66512	66514	66509	66509	66509	66509	66508	66511	66514	66523
10	66514	66514	66510	66509	66516	66513	66508	66508	66509	66510	66508	66508	66512	66523	66512
11	66511	66513	66509	66508	66510	66516	66514	66511	66509	66507	66509	66508	66513	66513	66514
12	66511	66513	66512	66509	66511	66511	66515	66508	66507	66509	66509	66505	66516	66525	66513
13	66511	66513	66511	66509	66512	66511	66515	66512	66509	66508	66509	66507	66515	66524	66513
14	66512	66513	66514	66509	66509	66514	66515	66508	66508	66510	66509	66509	66512	66516	66514
15	66512	66513	66513	66509	66510	66514	66513	66508	66508	66508	66508	66508	66514	66521	66514
16	66513	66511	66511	66508	66512	66511	66514	66508	66509	66510	66509	66509	66512	66521	66513
17	66514	66512	66508	66508	66511	66514	66515	66509	66509	66508	66510	66507	66512	66520	66513
18	66506	66512	66509	66508	66512	66508	66508	66509	66508	66510	66508	66504	66514	66521	66511
19	66506	66514	66513	66508	66516	66513	66514	66510	66508	66507	66509	66508	66513	66521	66512
20	66508	66508	66511	66509	66510	66513	66516	66508	66509	66508	66509	66509	66511	66521	66509
21	66514	66515	66511	66509	66510	66514	66515	66509	66513	66510	66509	66507	66511	66520	66515
22	66514	66514	66511	66511	66510	66513	66514	66509	66509	66510	66509	66509	66511	66521	66513
23	66514	66513	66516	66517	66510	66513	66514	66509	66509	66509	66508	66506	66512	66518	66514
25	66511	66514	66510	66513	66512	66513	66514	66509	66509	66509	66508	66509	66512	66517	66512
30	66512	66514	66513	66509	66514	66515	66514	66509	66508	66508	66509	66508	66514	66518	66511
40	66506	66514	66513	66509	66518	66516	66514	66512	66508	66507	66509	66509	66515	66521	66512

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	66532 bytes	–	100%
1,000	66513 bytes	-19 bytes	100%
10,000	66506 bytes	-7 bytes	100%
100,000	66504 bytes	-2 bytes	2.32%
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)	66632 bytes	+128 bytes (+0.19%)	+42 bytes
1	66590 bytes	+86 bytes (+0.13%)	–
2	66630 bytes	+126 bytes (+0.19%)	+40 bytes
3	66642 bytes	+138 bytes (+0.21%)	+52 bytes
4	66636 bytes	+132 bytes (+0.20%)	+46 bytes
5	66682 bytes	+178 bytes (+0.27%)	+92 bytes
6	66704 bytes	+200 bytes (+0.30%)	+114 bytes
7	66750 bytes	+246 bytes (+0.37%)	+160 bytes
8	66764 bytes	+260 bytes (+0.39%)	+174 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	48337 bytes	-18167 bytes (-27.32%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	51195 bytes	-15309 bytes (-23.02%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	55084 bytes	-11420 bytes (-17.17%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	58173 bytes	-8331 bytes (-12.53%)
Brotli (Wikipedia)	brotli	brotli -q 11	59298 bytes	-7206 bytes (-10.84%)
LZMA2 (Wikipedia)	xz	xz -9	61076 bytes	-5428 bytes (-8.16%)
Zstandard (Wikipedia)	zstd	zstd -19	62667 bytes	-3837 bytes (-5.77%)

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.