Dojo 1.6.3 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 380273 bytes (371.4k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 91828 bytes (89.7k, 24%).

After GZIP compression these minified files vary in size:

Boot	36011 bytes (35.2k)	CDN
cdnjs	31475 bytes (30.7k)	CDN
gzip -6 (default)	31393 bytes (30.7k)	local copy
gzip -9	31345 bytes (30.6k)	local copy
7zip -mx=9 -tgzip	29936 bytes (29.2k)	local copy
libdeflate -12	29919 bytes (29.2k)	local copy
kzip -s0 -rn -b3	29905 bytes (29.2k)	local copy
zultra	29899 bytes (29.2k)	local copy
pigz -11 -n	29875 bytes (29.2k)	local copy
Zopfli	29798 bytes (29.1k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.6.3.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.6.3 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 1677 bytes by using my Dojo 1.6.3 Zopfli version instead of the best available CDN (5.63% smaller than cdnjs, 29798 vs. 31475 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 --mls512 --bsr15 --lazy --ohh

(found February 26, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	512	--mls512
block splitting recursion	15	--bsr15
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

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.6.3/dojo.js --location | md5sum
e80d79f3564d83f970bbf99a569475a8 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.6.3.min.zopfli.js.gz | md5sum
e80d79f3564d83f970bbf99a569475a8 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.6.3/dojo.js --location | sha1sum
ce41b81caccfa6ee676fa72d23c44757f024d8ea -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.6.3.min.zopfli.js.gz | sha1sum
ce41b81caccfa6ee676fa72d23c44757f024d8ea -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	36011 bytes	e80d79f3564d83f970bbf99a569475a8	March 19, 2015 @ 15:33
cdnjs	31475 bytes	e80d79f3564d83f970bbf99a569475a8	February 8, 2015 @ 14:45

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
29798 bytes	-2 bytes	zopfli --i1000000 --mls512 --bsr15 --lazy --ohh	February 26, 2020 @ 23:59
29800 bytes	-3 bytes	zopfli --i100000 --mls512 --bsr15 --lazy --ohh	December 2, 2015 @ 11:42
29803 bytes	-1 byte	zopfli --i10000 --mls512 --bsr15 --lazy --ohh	November 22, 2015 @ 22:21
29804 bytes	-2 bytes	zopfli --i10000 --mls8 --bsr30 --lazy --ohh	September 24, 2015 @ 17:48
29806 bytes	-2 bytes	zopfli --i1000 --mls8 --bsr30 --lazy --ohh	September 24, 2015 @ 17:39
29808 bytes	-4 bytes	zopfli --i1000 --mls512 --bsr15 --lazy --ohh	September 20, 2015 @ 04:49
29812 bytes	-5 bytes	zopfli --i1000 --mls512 --bsr14 --lazy --ohh	September 10, 2015 @ 22:47
29817 bytes	–	zopfli --i100 --mls512 --bsr14 --lazy --ohh	September 10, 2015 @ 15:07

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 @ 12:48.

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	29842	29862	29843	29864	29851	29856	29878	29869	29880	29874	29866	29874	29872	29872	29870
4	29846	29845	29844	29844	29857	29870	29861	29861	29870	29860	29862	29870	29871	29871	29872
6	29831	29817	29828	29867	29827	29823	29849	29861	29837	29869	29862	29866	29861	29871	29868
7	29849	29843	29838	29837	29836	29832	29861	29859	29826	29865	29879	29855	29872	29861	29871
8	29821	29823	29817	29839	29846	29818	29868	29866	29828	29867	29863	29862	29869	29872	29871
9	29820	29842	29838	29840	29838	29835	29854	29858	29864	29867	29860	29870	29858	29872	29869
10	29826	29833	29811	29835	29822	29845	29866	29861	29858	29865	29853	29858	29871	29868	29860
11	29840	29835	29830	29839	29841	29834	29858	29858	29871	29854	29859	29866	29861	29860	29864
12	29815	29819	29819	29838	29835	29830	29855	29851	29831	29854	29852	29862	29864	29869	29867
13	29834	29837	29815	29832	29828	29829	29852	29854	29823	29852	29867	29859	29858	29869	29868
14	29808	29803	29827	29828	29828	29830	29835	29853	29804	29854	29855	29870	29865	29872	29870
15	29837	29802	29842	29826	29831	29831	29853	29862	29798	29855	29851	29866	29882	29872	29869
16	29811	29809	29818	29828	29840	29830	29854	29861	29864	29869	29861	29869	29876	29868	29871
17	29813	29831	29841	29842	29842	29847	29860	29858	29831	29865	29868	29862	29859	29869	29868
18	29822	29818	29843	29832	29836	29824	29816	29863	29825	29865	29865	29861	29858	29869	29868
19	29846	29815	29814	29823	29835	29820	29867	29857	29819	29865	29861	29863	29859	29864	29873
20	29839	29842	29810	29838	29835	29819	29842	29859	29841	29867	29817	29855	29870	29859	29868
21	29819	29812	29811	29837	29831	29849	29867	29864	29864	29867	29865	29862	29869	29875	29864
22	29845	29818	29816	29840	29829	29850	29859	29864	29863	29854	29861	29865	29861	29864	29869
23	29818	29813	29808	29839	29829	29818	29812	29857	29824	29866	29852	29866	29861	29869	29868
25	29816	29828	29815	29836	29838	29827	29837	29864	29809	29854	29854	29856	29877	29869	29871
30	29841	29834	29802	29830	29835	29830	29866	29857	29801	29851	29863	29863	29858	29869	29868
40	29812	29816	29812	29838	29837	29833	29853	29864	29823	29855	29862	29866	29862	29872	29871

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	29813 bytes	–	100%
1,000	29806 bytes	-7 bytes	100%
10,000	29803 bytes	-3 bytes	100%
100,000	29800 bytes	-3 bytes	1.74%
1,000,000	29798 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)	29918 bytes	+120 bytes (+0.40%)	+13 bytes
1	29914 bytes	+116 bytes (+0.39%)	+9 bytes
2	29955 bytes	+157 bytes (+0.53%)	+50 bytes
3	29905 bytes	+107 bytes (+0.36%)	–
4	29947 bytes	+149 bytes (+0.50%)	+42 bytes
5	29940 bytes	+142 bytes (+0.48%)	+35 bytes
6	29950 bytes	+152 bytes (+0.51%)	+45 bytes
7	29933 bytes	+135 bytes (+0.45%)	+28 bytes
8	29973 bytes	+175 bytes (+0.59%)	+68 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 - but your browser doesn't support it.

Algorithm	Program	Parameters	Size	Compared To Best Zopfli
ZPAQ (Wikipedia)	zpaq	zpaq -method 69	23528 bytes	-6270 bytes (-21.04%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	26436 bytes	-3362 bytes (-11.28%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	27441 bytes	-2357 bytes (-7.91%)
Brotli (Wikipedia)	brotli	brotli -q 11	27533 bytes	-2265 bytes (-7.60%)
LZMA2 (Wikipedia)	xz	xz -9	28464 bytes	-1334 bytes (-4.48%)
Zstandard (Wikipedia)	zstd	zstd -19	29253 bytes	-545 bytes (-1.83%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	29329 bytes	-469 bytes (-1.57%)

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.