Dojo 1.7.1 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 524788 bytes (512.5k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 130679 bytes (127.6k, 25%).

After GZIP compression these minified files vary in size:

Boot	52012 bytes (50.8k)	CDN
Baidu	45328 bytes (44.3k)	CDN
cdnjs	45322 bytes (44.3k)	CDN
gzip -6 (default)	45161 bytes (44.1k)	local copy
gzip -9	45134 bytes (44.1k)	local copy
Yandex	45128 bytes (44.1k)	CDN
7zip -mx=9 -tgzip	43088 bytes (42.1k)	local copy
libdeflate -12	43029 bytes (42.0k)	local copy
kzip -s0 -rn -b1	43009 bytes (42.0k)	local copy
zultra	42999 bytes (42.0k)	local copy
pigz -11 -n	42972 bytes (42.0k)	local copy
Zopfli	42916 bytes (41.9k)	local copy
Zopfli (defluff)	42914 bytes (41.9k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.7.1.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.7.1 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 2212 bytes by using my Dojo 1.7.1 Zopfli version instead of the best available CDN (5.15% smaller than Yandex, 42916 vs. 45128 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 --mls16 --bsr9 --lazy --ohh

(found February 27, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	16	--mls16
block splitting recursion	9	--bsr9
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 (42914 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-1.7.1/dojo.js --location | md5sum
9e07b21778e76fa6d9af8e53568bcd7f -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.1.min.zopfli.js.gz | md5sum
9e07b21778e76fa6d9af8e53568bcd7f -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.7.1/dojo.js --location | sha1sum
5fb5fb0235a7ae48333d954b8e98df729c963aa8 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.1.min.zopfli.js.gz | sha1sum
5fb5fb0235a7ae48333d954b8e98df729c963aa8 -

These CDNs send you the original file:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	52012 bytes	9e07b21778e76fa6d9af8e53568bcd7f	March 19, 2015 @ 15:33
cdnjs	45322 bytes	9e07b21778e76fa6d9af8e53568bcd7f	February 8, 2015 @ 14:45

And some CDNs send you a different file:

CDN	Size (compressed)	MD5 (uncompressed)	Comment / Diff	Timestamp
Baidu	45328 bytes	d45f42225ad109b7cd93d12adfa2e812	only whitespaces differ	January 7, 2015 @ 10:16
Yandex	45128 bytes	4a02353e1888f684fc4e76149ced9837	< (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
42916 bytes	-4 bytes	zopfli --i1000000 --mls16 --bsr9 --lazy --ohh	February 27, 2020 @ 00:09
42920 bytes	-1 byte	zopfli --i100000 --mls16 --bsr9 --lazy --ohh	February 27, 2016 @ 21:11
42921 bytes	-5 bytes	zopfli --i10000 --mls256 --bsr20 --lazy --ohh	December 2, 2015 @ 12:21
42926 bytes	-1 byte	zopfli --i10000 --mls8192 --bsr7 --lazy --ohh	November 22, 2015 @ 22:23
42927 bytes	-1 byte	zopfli --i1000 --mls8192 --bsr30 --lazy --ohh	September 24, 2015 @ 18:13
42928 bytes	-1 byte	zopfli --i1000 --mls8192 --bsr7 --lazy --ohh	September 14, 2015 @ 15:32
42929 bytes	-1 byte	zopfli --i1000 --mls256 --bsr16 --lazy --ohh	September 14, 2015 @ 15:32
42930 bytes	-1 byte	zopfli --i1000 --mls512 --bsr7 --lazy --ohh	September 14, 2015 @ 15:31
42931 bytes	-4 bytes	zopfli --i1000 --mls512 --bsr6 --lazy --ohh	September 10, 2015 @ 22:25
42935 bytes	-1 byte	zopfli --i1000 --mls512 --bsr4 --lazy --ohh	September 10, 2015 @ 22:25
42936 bytes	–	zopfli --i100 --mls512 --bsr9 --lazy --ohh	September 10, 2015 @ 15:03

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, 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	42982	42975	42983	42933	42939	42932	42931	42931	42931	42931	42935	42935	42956	42949	42961
4	42964	42967	42927	42930	42923	42928	42928	42929	42934	42931	42951	42950	42949	42940	42927
6	42971	42940	42932	42930	42925	42935	42932	42927	42928	42932	42932	42928	42939	42945	42930
7	42961	42961	42945	42929	42937	42955	42934	42932	42929	42927	42933	42955	42926	42935	42945
8	42965	42961	42928	42947	42933	42943	42931	42927	42930	42943	42933	42953	42936	42940	42927
9	42979	42970	42944	42916	42932	42947	42929	42927	42930	42947	42933	42950	42944	42945	42928
10	42969	42924	42941	42933	42929	42942	42931	42936	42931	42926	42959	42945	42943	42943	42938
11	42965	42963	42947	42924	42925	42943	42946	42927	42928	42928	42932	42947	42946	42941	42934
12	42967	42961	42945	42930	42936	42943	42932	42926	42931	42921	42945	42945	42944	42934	42934
13	42967	42963	42931	42924	42926	42949	42948	42934	42930	42932	42944	42930	42944	42942	42934
14	42969	42961	42950	42924	42926	42950	42932	42927	42930	42947	42933	42954	42942	42941	42933
15	42980	42970	42941	42925	42925	42942	42941	42928	42930	42927	42955	42950	42939	42937	42943
16	42966	42964	42927	42925	42927	42942	42927	42926	42932	42947	42954	42931	42944	42928	42938
17	42969	42962	42944	42924	42933	42942	42933	42927	42933	42948	42933	42930	42945	42943	42932
18	42969	42961	42945	42929	42928	42944	42950	42928	42929	42943	42934	42951	42935	42945	42951
19	42968	42963	42943	42930	42929	42940	42951	42925	42931	42943	42934	42949	42943	42941	42926
20	42983	42961	42946	42924	42934	42942	42947	42921	42931	42925	42944	42953	42944	42936	42934
21	42969	42961	42949	42925	42933	42950	42943	42924	42928	42946	42947	42956	42943	42928	42933
22	42963	42962	42925	42927	42929	42942	42948	42923	42931	42951	42947	42953	42938	42934	42934
23	42962	42961	42934	42924	42926	42942	42947	42932	42929	42948	42947	42955	42954	42944	42942
25	42965	42963	42929	42929	42926	42942	42934	42930	42928	42952	42943	42945	42933	42942	42933
30	42968	42964	42928	42923	42936	42950	42930	42925	42931	42948	42953	42954	42927	42942	42933
40	42962	42964	42941	42943	42927	42942	42943	42925	42932	42943	42954	42945	42944	42933	42933

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	42934 bytes	–	100%
1,000	42927 bytes	-7 bytes	100%
10,000	42921 bytes	-6 bytes	100%
100,000	42920 bytes	-1 byte	1.16%
1,000,000	42916 bytes	-4 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)	43030 bytes	+114 bytes (+0.27%)	+21 bytes
1	43009 bytes	+93 bytes (+0.22%)	–
2	43034 bytes	+118 bytes (+0.27%)	+25 bytes
3	43048 bytes	+132 bytes (+0.31%)	+39 bytes
4	43074 bytes	+158 bytes (+0.37%)	+65 bytes
5	43057 bytes	+141 bytes (+0.33%)	+48 bytes
6	43091 bytes	+175 bytes (+0.41%)	+82 bytes
7	43128 bytes	+212 bytes (+0.49%)	+119 bytes
8	43156 bytes	+240 bytes (+0.56%)	+147 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	32270 bytes	-10646 bytes (-24.81%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	37632 bytes	-5284 bytes (-12.31%)
Brotli (Wikipedia)	brotli	brotli -q 11	39492 bytes	-3424 bytes (-7.98%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	39524 bytes	-3392 bytes (-7.90%)
LZMA2 (Wikipedia)	xz	xz -9	40504 bytes	-2412 bytes (-5.62%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	41639 bytes	-1277 bytes (-2.98%)
Zstandard (Wikipedia)	zstd	zstd -19	41680 bytes	-1236 bytes (-2.88%)

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.