Dojo 1.11.12 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 633670 bytes (618.8k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 166030 bytes (162.1k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	56017 bytes (54.7k)	local copy
gzip -9	55960 bytes (54.6k)	local copy
libdeflate -12	53317 bytes (52.1k)	local copy
7zip -mx=9 -tgzip	53292 bytes (52.0k)	local copy
pigz -11 -n	53221 bytes (52.0k)	local copy
zultra	53221 bytes (52.0k)	local copy
kzip -s0 -rn -b1	53215 bytes (52.0k)	local copy
Zopfli	53125 bytes (51.9k)	local copy
Zopfli (defluff)	53124 bytes (51.9k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.11.12.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.11.12 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

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 --mls128 --bsr15 --lazy --ohh

(found March 5, 2022)

Description	Value	Parameter
iterations	100000	--i100000
maximum blocks	8	--mb8
maximum length score	128	--mls128
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

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 (53124 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-1.11.12/dojo.js --location | md5sum
71a62ae0b49cc114fe7d3f1d717ca160 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.11.12.min.zopfli.js.gz | md5sum
71a62ae0b49cc114fe7d3f1d717ca160 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.11.12/dojo.js --location | sha1sum
3cdb2e4c98a705db724b5d48680c417fc6980f6d -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.11.12.min.zopfli.js.gz | sha1sum
3cdb2e4c98a705db724b5d48680c417fc6980f6d -

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
53125 bytes	-5 bytes	zopfli --i100000 --mls128 --bsr15 --lazy --ohh	March 5, 2022 @ 10:24
53130 bytes	-1 byte	zopfli --i100000 --mls8 --bsr40 --lazy --ohh	March 4, 2022 @ 22:55
53131 bytes	-2 bytes	zopfli --i10000 --mls8 --bsr40 --lazy --ohh	March 1, 2022 @ 16:21
53133 bytes	-1 byte	zopfli --i10000 --mls16 --bsr40 --lazy --ohh	February 28, 2022 @ 00:27
53134 bytes	-1 byte	zopfli --i10000 --mls64 --bsr10 --lazy --ohh	February 26, 2022 @ 07:38
53135 bytes	-1 byte	zopfli --i1000 --mls8 --bsr23 --lazy --ohh	February 25, 2022 @ 03:35
53136 bytes	-1 byte	zopfli --i1000 --mls32 --bsr7 --lazy --ohh	February 24, 2022 @ 19:54
53137 bytes	-1 byte	zopfli --i1000 --mls16 --bsr17 --lazy --ohh	February 24, 2022 @ 18:11
53138 bytes	–	zopfli --i100 --mls16 --bsr17 --lazy --ohh	February 24, 2022 @ 16:30

If there are multiple parameter sets yielding the same compressed size, only the first one found is shown.

Most recent activity on March 14, 2022 @ 18:01.

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	53136	53136	53137	53138	53138	53137	53136	53133	53136	53151	53150	53137	53148	53161	53157
4	53173	53133	53135	53134	53147	53155	53133	53134	53140	53136	53143	53136	53140	53142	53162
6	53166	53136	53135	53138	53142	53135	53134	53134	53150	53147	53147	53141	53143	53144	53146
7	53163	53172	53173	53135	53133	53149	53141	53140	53146	53146	53150	53141	53144	53152	53146
8	53166	53162	53135	53135	53136	53149	53133	53135	53142	53146	53147	53146	53153	53145	53149
9	53135	53173	53135	53139	53133	53136	53135	53134	53143	53145	53146	53138	53149	53144	53145
10	53133	53162	53140	53165	53146	53134	53147	53135	53147	53146	53147	53137	53150	53151	53158
11	53166	53165	53143	53136	53137	53137	53132	53132	53136	53145	53147	53142	53145	53153	53145
12	53164	53164	53136	53134	53136	53139	53132	53133	53147	53149	53146	53146	53143	53145	53154
13	53164	53173	53135	53136	53136	53145	53132	53134	53147	53145	53147	53145	53144	53149	53143
14	53133	53161	53142	53135	53139	53139	53125	53135	53146	53151	53147	53138	53145	53145	53147
15	53168	53171	53142	53134	53135	53137	53125	53142	53148	53148	53146	53144	53143	53156	53154
16	53168	53162	53143	53167	53134	53133	53134	53135	53142	53145	53146	53146	53144	53156	53146
17	53164	53162	53136	53135	53134	53137	53134	53141	53147	53146	53150	53136	53147	53144	53154
18	53166	53173	53136	53135	53139	53137	53132	53141	53144	53145	53144	53135	53138	53150	53148
19	53168	53175	53136	53135	53138	53139	53133	53135	53146	53147	53147	53138	53145	53148	53155
20	53166	53175	53136	53135	53138	53138	53135	53141	53147	53146	53147	53144	53145	53148	53154
21	53166	53160	53135	53135	53136	53135	53135	53135	53144	53148	53147	53142	53150	53153	53148
22	53164	53162	53136	53135	53138	53134	53132	53142	53146	53147	53147	53144	53138	53149	53152
23	53168	53162	53132	53136	53134	53135	53132	53142	53144	53147	53148	53137	53146	53154	53148
25	53159	53177	53133	53135	53134	53133	53143	53143	53146	53146	53147	53137	53143	53150	53149
30	53163	53158	53136	53134	53138	53133	53133	53142	53147	53145	53147	53143	53145	53152	53149
40	53166	53167	53130	53133	53137	53133	53140	53141	53144	53145	53146	53142	53149	53144	53154

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	53138 bytes	–	100%
1,000	53135 bytes	-3 bytes	100%
10,000	53131 bytes	-4 bytes	100%
100,000	53125 bytes	-6 bytes	1.74%
1,000,000	53125 bytes	–	0.58%
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)	53247 bytes	+122 bytes (+0.23%)	+32 bytes
1	53215 bytes	+90 bytes (+0.17%)	–
2	53239 bytes	+114 bytes (+0.21%)	+24 bytes
3	53262 bytes	+137 bytes (+0.26%)	+47 bytes
4	53297 bytes	+172 bytes (+0.32%)	+82 bytes
5	53330 bytes	+205 bytes (+0.39%)	+115 bytes
6	53371 bytes	+246 bytes (+0.46%)	+156 bytes
7	53388 bytes	+263 bytes (+0.50%)	+173 bytes
8	53375 bytes	+250 bytes (+0.47%)	+160 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	39049 bytes	-14076 bytes (-26.50%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46610 bytes	-6515 bytes (-12.26%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47516 bytes	-5609 bytes (-10.56%)
Brotli (Wikipedia)	brotli	brotli -q 11	49111 bytes	-4014 bytes (-7.56%)
LZMA2 (Wikipedia)	xz	xz -9	50124 bytes	-3001 bytes (-5.65%)
Zstandard (Wikipedia)	zstd	zstd -19	51432 bytes	-1693 bytes (-3.19%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51799 bytes	-1326 bytes (-2.50%)

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 2026.
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.