Dojo 1.8.0 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 597748 bytes (583.7k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 155966 bytes (152.3k, 26%).

After GZIP compression these minified files vary in size:

Boot	61747 bytes (60.3k)	CDN
Baidu	53568 bytes (52.3k)	CDN
cdnjs	53561 bytes (52.3k)	CDN
gzip -6 (default)	53313 bytes (52.1k)	local copy
gzip -9	53254 bytes (52.0k)	local copy
Yandex	53242 bytes (52.0k)	CDN
libdeflate -12	50777 bytes (49.6k)	local copy
7zip -mx=9 -tgzip	50756 bytes (49.6k)	local copy
kzip -s0 -rn -b1	50686 bytes (49.5k)	local copy
zultra	50676 bytes (49.5k)	local copy
pigz -11 -n	50674 bytes (49.5k)	local copy
Zopfli	50510 bytes (49.3k)	local copy
Zopfli (defluff)	50509 bytes (49.3k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.8.0.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.8.0 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 2732 bytes by using my Dojo 1.8.0 Zopfli version instead of the best available CDN (5.41% smaller than Yandex, 50510 vs. 53242 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 --mls2 --bsr4 --lazy --ohh

(found February 25, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	2	--mls2
block splitting recursion	4	--bsr4
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 (50509 bytes).

Download

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.8.0/dojo.js --location | md5sum
65666ba02155ec0cb55452cf8422dc31 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.8.0.min.zopfli.js.gz | md5sum
65666ba02155ec0cb55452cf8422dc31 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.8.0/dojo.js --location | sha1sum
4d13d6616235c683ce587724d9afda978033449f -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.8.0.min.zopfli.js.gz | sha1sum
4d13d6616235c683ce587724d9afda978033449f -

These CDNs send you the original file:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	61747 bytes	65666ba02155ec0cb55452cf8422dc31	March 19, 2015 @ 15:36
cdnjs	53561 bytes	65666ba02155ec0cb55452cf8422dc31	February 8, 2015 @ 14:45

And some CDNs send you a different file:

CDN	Size (compressed)	MD5 (uncompressed)	Comment / Diff	Timestamp
Baidu	53568 bytes	b8ab51dc9c7792d102bd1957da5d106e	only whitespaces differ	January 7, 2015 @ 10:16
Yandex	53242 bytes	0e3b3c81adffcf5a26d9b375db055dee	< (function(_1,_2){var _3=function(){},_4=function(it){for(v [...] > (function(_1,_2){var _3=function(){},_4=function(it){for(v [...]	June 20, 2013 @ 11:59

Note: only the MD5 hashes are shown to keep things simple.

Other Versions

Available Dojo versions at minime.stephan-brumme.com:

1.17.3, 1.17.2, 1.17.1, 1.17.0,
1.16.5, 1.16.4, 1.16.3, 1.16.2, 1.16.1, 1.16.0,
1.15.6, 1.15.5, 1.15.4, 1.15.3, 1.15.2, 1.15.1, 1.15.0,
1.14.9, 1.14.8, 1.14.7, 1.14.6, 1.14.5, 1.14.4, 1.14.3, 1.14.2, 1.14.1, 1.14.0,
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,
1.12.11, 1.12.10, 1.12.9, 1.12.8, 1.12.7, 1.12.6, 1.12.5, 1.12.4, 1.12.3, 1.12.2, 1.12.1,
1.11.13, 1.11.12, 1.11.11, 1.11.10, 1.11.9, 1.11.8, 1.11.7, 1.11.6, 1.11.5, 1.11.4, 1.11.3, 1.11.2, 1.11.1, 1.11.0,
1.10.10, 1.10.9, 1.10.8, 1.10.7, 1.10.6, 1.10.5, 1.10.4, 1.10.3, 1.10.2, 1.10.1, 1.10.0,
1.9.11, 1.9.10, 1.9.9, 1.9.8, 1.9.7, 1.9.6, 1.9.5, 1.9.4, 1.9.3, 1.9.2, 1.9.1, 1.9.0,
1.8.14, 1.8.13, 1.8.12, 1.8.11, 1.8.10, 1.8.9, 1.8.8, 1.8.7, 1.8.6, 1.8.5, 1.8.4, 1.8.3, 1.8.2, 1.8.1, 1.8.0,
1.7.12, 1.7.11, 1.7.10, 1.7.9, 1.7.8, 1.7.7, 1.7.6, 1.7.5, 1.7.4, 1.7.3, 1.7.2, 1.7.1, 1.7.0,
1.6.5, 1.6.4, 1.6.3, 1.6.2, 1.6.1, 1.6.0,
1.5.6, 1.5.5, 1.5.4, 1.5.3, 1.5.2, 1.5.1, 1.5.0,
1.4.8, 1.4.7, 1.4.6, 1.4.5, 1.4.4, 1.4.3, 1.4.2, 1.4.1, 1.4.0,
1.3.3, 1.3.2, 1.3.1, 1.3.0,
1.2.3, 1.2.2

The project site contains an overview how well these versions were compressed.
Other interesting projects are AngularJS, BackboneJS, Bootstrap, D3, Ember, jQuery, Knockout, lodash, React, Socket.IO, ThreeJS, UnderscoreJS and Vue.

Changelog

Best Zopfli parameters so far:

Size	Improvement	Parameters	Found
50510 bytes	-2 bytes	zopfli --i1000000 --mls2 --bsr4 --lazy --ohh	February 25, 2020 @ 19:30
50512 bytes	-6 bytes	zopfli --i100000 --mls2 --bsr4 --lazy --ohh	December 3, 2015 @ 11:01
50518 bytes	-2 bytes	zopfli --i10000 --mls2 --bsr4 --lazy --ohh	October 14, 2015 @ 04:14
50520 bytes	-7 bytes	zopfli --i1000 --mls2 --bsr4 --lazy --ohh	September 23, 2015 @ 06:41
50527 bytes	-5 bytes	zopfli --i1000 --mls4 --bsr4 --lazy --ohh	September 21, 2015 @ 22:13
50532 bytes	–	zopfli --i100 --mls4 --bsr4 --lazy --ohh	September 21, 2015 @ 13:14

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 @ 12:47.

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	50577	50540	50535	50578	50577	50577	50579	50577	50584	50606	50604	50601	50597	50606	50576
4	50510	50518	50537	50573	50570	50583	50579	50584	50578	50577	50600	50577	50584	50581	50578
6	50556	50543	50537	50573	50584	50586	50573	50586	50578	50570	50589	50583	50600	50594	50574
7	50532	50593	50590	50545	50574	50582	50577	50574	50577	50577	50597	50577	50599	50586	50602
8	50611	50547	50557	50573	50571	50581	50577	50582	50577	50572	50600	50586	50598	50597	50620
9	50548	50574	50534	50572	50572	50573	50576	50574	50577	50571	50596	50596	50600	50598	50574
10	50543	50533	50540	50541	50575	50595	50576	50574	50577	50585	50587	50602	50604	50594	50574
11	50539	50528	50596	50573	50574	50582	50577	50575	50577	50578	50586	50602	50601	50583	50603
12	50552	50527	50529	50573	50574	50575	50575	50577	50577	50573	50584	50581	50599	50574	50582
13	50534	50529	50531	50573	50573	50575	50576	50578	50578	50591	50589	50582	50600	50604	50574
14	50540	50529	50550	50573	50572	50575	50575	50574	50577	50572	50589	50600	50601	50569	50579
15	50568	50526	50532	50574	50573	50574	50577	50579	50579	50572	50588	50581	50606	50579	50602
16	50531	50532	50532	50540	50573	50574	50575	50574	50577	50572	50589	50583	50600	50569	50599
17	50535	50530	50539	50541	50573	50573	50574	50574	50577	50575	50588	50582	50604	50591	50601
18	50532	50544	50542	50576	50575	50574	50578	50575	50581	50571	50588	50599	50603	50570	50599
19	50574	50537	50574	50574	50574	50573	50575	50578	50577	50570	50589	50602	50600	50574	50574
20	50539	50532	50539	50575	50572	50574	50576	50583	50577	50571	50585	50576	50599	50595	50602
21	50574	50532	50538	50574	50572	50574	50575	50578	50577	50571	50593	50584	50600	50578	50576
22	50533	50540	50538	50574	50574	50578	50574	50583	50576	50569	50583	50597	50604	50597	50574
23	50531	50533	50536	50574	50574	50578	50575	50575	50578	50574	50584	50600	50601	50575	50602
25	50570	50530	50532	50572	50574	50596	50573	50578	50577	50573	50583	50602	50599	50573	50602
30	50568	50576	50536	50572	50575	50574	50575	50581	50575	50575	50589	50596	50602	50590	50573
40	50540	50532	50540	50574	50573	50574	50575	50574	50578	50577	50586	50597	50601	50575	50574

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	50532 bytes	–	100%
1,000	50520 bytes	-12 bytes	100%
10,000	50518 bytes	-2 bytes	100%
100,000	50512 bytes	-6 bytes	0.58%
1,000,000	50510 bytes	-2 bytes	0.29%
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)	50721 bytes	+211 bytes (+0.42%)	+35 bytes
1	50686 bytes	+176 bytes (+0.35%)	–
2	50698 bytes	+188 bytes (+0.37%)	+12 bytes
3	50729 bytes	+219 bytes (+0.43%)	+43 bytes
4	50766 bytes	+256 bytes (+0.51%)	+80 bytes
5	50791 bytes	+281 bytes (+0.56%)	+105 bytes
6	50773 bytes	+263 bytes (+0.52%)	+87 bytes
7	50786 bytes	+276 bytes (+0.55%)	+100 bytes
8	50773 bytes	+263 bytes (+0.52%)	+87 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	37236 bytes	-13274 bytes (-26.28%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	44077 bytes	-6433 bytes (-12.74%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	45386 bytes	-5124 bytes (-10.14%)
Brotli (Wikipedia)	brotli	brotli -q 11	46452 bytes	-4058 bytes (-8.03%)
LZMA2 (Wikipedia)	xz	xz -9	47544 bytes	-2966 bytes (-5.87%)
Zstandard (Wikipedia)	zstd	zstd -19	48994 bytes	-1516 bytes (-3.00%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	49010 bytes	-1500 bytes (-2.97%)

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 2023.
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.