Dojo 1.13.3 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 636226 bytes (621.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 166650 bytes (162.7k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	56074 bytes (54.8k)	local copy
gzip -9	56013 bytes (54.7k)	local copy
libdeflate -12	53364 bytes (52.1k)	local copy
7zip -mx=9 -tgzip	53347 bytes (52.1k)	local copy
zultra	53276 bytes (52.0k)	local copy
kzip -s0 -rn -b4	53258 bytes (52.0k)	local copy
pigz -11 -n	53247 bytes (52.0k)	local copy
Zopfli	53175 bytes (51.9k)	local copy
Zopfli (defluff)	53172 bytes (51.9k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.13.3.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.13.3 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

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 --mls4 --bsr9 --lazy --ohh

(found October 3, 2018)

Description	Value	Parameter
iterations	100000	--i100000
maximum blocks	8	--mb8
maximum length score	4	--mls4
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 3 more bytes (53172 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-1.13.3/dojo.js --location | md5sum
039c267bae991a6b0b23964e92bb903f -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.3.min.zopfli.js.gz | md5sum
039c267bae991a6b0b23964e92bb903f -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.3/dojo.js --location | sha1sum
30e4f200b9bb3f8b9201a8db3d6e181b0cc54bef -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.3.min.zopfli.js.gz | sha1sum
30e4f200b9bb3f8b9201a8db3d6e181b0cc54bef -

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
53175 bytes	-1 byte	zopfli --i100000 --mls4 --bsr9 --lazy --ohh	October 3, 2018 @ 14:02
53176 bytes	-6 bytes	zopfli --i100000 --mls8 --bsr10 --lazy --ohh	October 3, 2018 @ 10:35
53182 bytes	-1 byte	zopfli --i10000 --mls8 --bsr10 --lazy --ohh	October 3, 2018 @ 00:06
53183 bytes	-5 bytes	zopfli --i10000 --mls4 --bsr40 --lazy --ohh	October 2, 2018 @ 23:39
53188 bytes	-1 byte	zopfli --i1000 --mls16 --bsr40 --lazy --ohh	October 2, 2018 @ 12:39
53189 bytes	-1 byte	zopfli --i1000 --mls4 --bsr9 --lazy --ohh	October 2, 2018 @ 12:35
53190 bytes	–	zopfli --i100 --mls256 --bsr30 --lazy --ohh	October 2, 2018 @ 11:33

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

Most recent activity on March 19, 2022 @ 20:08.

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	53179	53184	53186	53185	53185	53184	53183	53183	53184	53188	53200	53191	53193	53223	53204
4	53218	53183	53185	53185	53192	53198	53183	53184	53195	53190	53194	53198	53199	53195	53205
6	53216	53185	53185	53191	53192	53192	53188	53184	53194	53190	53194	53196	53195	53196	53196
7	53215	53212	53187	53185	53185	53184	53175	53191	53194	53198	53196	53194	53197	53200	53198
8	53219	53183	53184	53184	53184	53195	53182	53188	53194	53199	53201	53186	53193	53203	53198
9	53188	53175	53189	53184	53189	53188	53184	53183	53194	53196	53198	53190	53194	53207	53207
10	53178	53183	53176	53219	53186	53184	53191	53184	53194	53196	53212	53191	53199	53204	53200
11	53187	53183	53184	53184	53189	53187	53175	53178	53195	53198	53200	53195	53198	53204	53193
12	53221	53183	53185	53186	53188	53188	53175	53184	53195	53185	53198	53199	53196	53199	53196
13	53216	53183	53185	53186	53186	53190	53175	53179	53194	53196	53200	53199	53202	53201	53196
14	53187	53185	53183	53187	53188	53188	53183	53188	53192	53189	53208	53197	53198	53197	53192
15	53208	53187	53191	53186	53188	53186	53183	53185	53195	53198	53209	53198	53196	53200	53198
16	53224	53214	53184	53178	53183	53196	53184	53188	53193	53197	53197	53199	53194	53197	53192
17	53216	53216	53189	53186	53184	53198	53184	53195	53194	53186	53198	53187	53192	53198	53199
18	53187	53183	53185	53188	53183	53186	53175	53195	53194	53195	53196	53185	53196	53205	53193
19	53188	53176	53185	53185	53185	53211	53175	53188	53194	53198	53199	53190	53198	53204	53199
20	53215	53220	53185	53185	53189	53195	53185	53195	53196	53199	53209	53197	53199	53198	53206
21	53215	53212	53184	53185	53185	53185	53189	53179	53194	53198	53200	53195	53200	53197	53200
22	53222	53176	53185	53185	53187	53183	53175	53185	53195	53199	53211	53196	53195	53187	53196
23	53185	53185	53187	53189	53188	53187	53183	53184	53194	53198	53200	53186	53196	53199	53188
25	53214	53215	53175	53185	53183	53184	53183	53194	53194	53196	53199	53187	53197	53197	53191
30	53215	53225	53185	53185	53184	53183	53183	53185	53194	53199	53199	53195	53195	53200	53196
40	53225	53183	53186	53186	53183	53183	53185	53190	53195	53193	53209	53198	53202	53196	53196

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	53190 bytes	–	100%
1,000	53188 bytes	-2 bytes	100%
10,000	53182 bytes	-6 bytes	100%
100,000	53175 bytes	-7 bytes	6.09%
1,000,000	53175 bytes	–	2.61%
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)	53261 bytes	+86 bytes (+0.16%)	+3 bytes
1	53269 bytes	+94 bytes (+0.18%)	+11 bytes
2	53292 bytes	+117 bytes (+0.22%)	+34 bytes
3	53322 bytes	+147 bytes (+0.28%)	+64 bytes
4	53258 bytes	+83 bytes (+0.16%)	–
5	53294 bytes	+119 bytes (+0.22%)	+36 bytes
6	53305 bytes	+130 bytes (+0.24%)	+47 bytes
7	53287 bytes	+112 bytes (+0.21%)	+29 bytes
8	53332 bytes	+157 bytes (+0.30%)	+74 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	39113 bytes	-14062 bytes (-26.44%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46648 bytes	-6527 bytes (-12.27%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47605 bytes	-5570 bytes (-10.47%)
Brotli (Wikipedia)	brotli	brotli -q 11	49064 bytes	-4111 bytes (-7.73%)
LZMA2 (Wikipedia)	xz	xz -9	50172 bytes	-3003 bytes (-5.65%)
Zstandard (Wikipedia)	zstd	zstd -19	51619 bytes	-1556 bytes (-2.93%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51885 bytes	-1290 bytes (-2.43%)

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.