Dojo 1.9.0 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 613027 bytes (598.7k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 159423 bytes (155.7k, 26%).

After GZIP compression these minified files vary in size:

Boot	63370 bytes (61.9k)	CDN
cdnjs	54921 bytes (53.6k)	CDN
gzip -6 (default)	54681 bytes (53.4k)	local copy
gzip -9	54624 bytes (53.3k)	local copy
jsdelivr	54594 bytes (53.3k)	CDN
7zip -mx=9 -tgzip	52032 bytes (50.8k)	local copy
libdeflate -12	52029 bytes (50.8k)	local copy
zultra	52007 bytes (50.8k)	local copy
pigz -11 -n	51989 bytes (50.8k)	local copy
kzip -s0 -rn -b1	51983 bytes (50.8k)	local copy
Zopfli	51817 bytes (50.6k)	local copy
Zopfli (defluff)	51815 bytes (50.6k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.9.0.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.9.0 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 2777 bytes by using my Dojo 1.9.0 Zopfli version instead of the best available CDN (5.36% smaller than jsdelivr, 51817 vs. 54594 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 --mls4 --bsr4 --lazy --ohh

(found January 30, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	4	--mls4
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 2 more bytes (51815 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-1.9.0/dojo.js --location | md5sum
0c560e1d33b8fba04b506ecac0374acb -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.9.0.min.zopfli.js.gz | md5sum
0c560e1d33b8fba04b506ecac0374acb -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.9.0/dojo.js --location | sha1sum
1bd7a0b4c08d8fcfae11f46e72d5bc443e97f754 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.9.0.min.zopfli.js.gz | sha1sum
1bd7a0b4c08d8fcfae11f46e72d5bc443e97f754 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	63370 bytes	0c560e1d33b8fba04b506ecac0374acb	March 19, 2015 @ 15:41
cdnjs	54921 bytes	0c560e1d33b8fba04b506ecac0374acb	February 8, 2015 @ 14:45
jsdelivr	54594 bytes	0c560e1d33b8fba04b506ecac0374acb	August 7, 2014 @ 19:16

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
51817 bytes	-2 bytes	zopfli --i1000000 --mls4 --bsr4 --lazy --ohh	January 30, 2020 @ 21:08
51819 bytes	-5 bytes	zopfli --i100000 --mls4 --bsr4 --lazy --ohh	December 3, 2015 @ 17:11
51824 bytes	-3 bytes	zopfli --i100000 --mls2 --bsr20 --lazy --ohh	December 3, 2015 @ 16:07
51827 bytes	-1 byte	zopfli --i10000 --mls2 --bsr20 --lazy --ohh	October 14, 2015 @ 00:07
51828 bytes	-2 bytes	zopfli --i10000 --mls4 --bsr4 --lazy --ohh	October 13, 2015 @ 18:48
51830 bytes	-5 bytes	zopfli --i1000 --mls4 --bsr4 --lazy --ohh	September 21, 2015 @ 17:53
51835 bytes	–	zopfli --i100 --mls4 --bsr4 --lazy --ohh	September 21, 2015 @ 13:37

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	51898	51898	51895	51895	51898	51899	51897	51897	51911	51920	51915	51916	51912	51916	51935
4	51828	51817	51851	51902	51901	51896	51898	51902	51898	51902	51909	51908	51892	51894	51886
6	51848	51847	51842	51907	51897	51898	51899	51899	51896	51897	51915	51913	51902	51904	51889
7	51843	51894	51836	51899	51897	51897	51898	51899	51897	51908	51906	51909	51901	51892	51890
8	51847	51835	51898	51899	51894	51891	51897	51899	51907	51894	51893	51892	51901	51896	51904
9	51849	51835	51898	51900	51891	51890	51898	51901	51904	51907	51908	51911	51909	51894	51898
10	51843	51855	51835	51899	51897	51891	51898	51902	51899	51893	51896	51906	51902	51894	51894
11	51835	51837	51836	51905	51897	51891	51897	51903	51904	51899	51900	51908	51904	51912	51887
12	51847	51849	51835	51906	51890	51892	51897	51900	51899	51888	51897	51916	51906	51888	51889
13	51846	51836	51835	51899	51893	51891	51899	51899	51904	51904	51910	51910	51906	51892	51896
14	51849	51837	51834	51912	51895	51890	51897	51899	51905	51886	51902	51908	51902	51895	51890
15	51832	51843	51836	51898	51897	51892	51899	51899	51897	51889	51907	51909	51904	51892	51887
16	51842	51849	51836	51897	51892	51897	51904	51902	51904	51893	51908	51910	51906	51891	51897
17	51835	51849	51896	51911	51895	51896	51898	51891	51902	51895	51906	51908	51902	51888	51888
18	51835	51847	51907	51908	51892	51897	51899	51903	51901	51893	51901	51909	51915	51887	51886
19	51838	51856	51899	51907	51891	51891	51899	51899	51906	51892	51896	51902	51902	51887	51891
20	51824	51851	51900	51907	51891	51891	51897	51903	51899	51889	51905	51910	51902	51895	51887
21	51827	51836	51836	51897	51893	51891	51898	51899	51900	51887	51906	51908	51907	51890	51889
22	51834	51835	51897	51897	51890	51897	51897	51899	51901	51894	51894	51898	51901	51902	51895
23	51836	51847	51898	51907	51894	51898	51898	51898	51900	51892	51907	51912	51902	51892	51893
25	51845	51849	51897	51907	51893	51897	51897	51899	51901	51900	51903	51909	51909	51894	51889
30	51838	51835	51834	51897	51896	51891	51896	51899	51903	51907	51894	51899	51902	51896	51905
40	51829	51851	51837	51899	51891	51898	51897	51901	51897	51894	51910	51909	51904	51890	51896

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	51835 bytes	–	100%
1,000	51830 bytes	-5 bytes	100%
10,000	51827 bytes	-3 bytes	100%
100,000	51819 bytes	-8 bytes	1.45%
1,000,000	51817 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)	52034 bytes	+217 bytes (+0.42%)	+51 bytes
1	51983 bytes	+166 bytes (+0.32%)	–
2	51998 bytes	+181 bytes (+0.35%)	+15 bytes
3	52035 bytes	+218 bytes (+0.42%)	+52 bytes
4	52055 bytes	+238 bytes (+0.46%)	+72 bytes
5	52081 bytes	+264 bytes (+0.51%)	+98 bytes
6	52115 bytes	+298 bytes (+0.58%)	+132 bytes
7	52124 bytes	+307 bytes (+0.59%)	+141 bytes
8	52134 bytes	+317 bytes (+0.61%)	+151 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	38010 bytes	-13807 bytes (-26.65%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	45077 bytes	-6740 bytes (-13.01%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	46472 bytes	-5345 bytes (-10.32%)
Brotli (Wikipedia)	brotli	brotli -q 11	47463 bytes	-4354 bytes (-8.40%)
LZMA2 (Wikipedia)	xz	xz -9	48688 bytes	-3129 bytes (-6.04%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	50144 bytes	-1673 bytes (-3.23%)
Zstandard (Wikipedia)	zstd	zstd -19	50160 bytes	-1657 bytes (-3.20%)

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.