Dojo 1.13.1 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 636162 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 166591 bytes (162.7k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	56064 bytes (54.8k)	local copy
gzip -9	56003 bytes (54.7k)	local copy
libdeflate -12	53351 bytes (52.1k)	local copy
7zip -mx=9 -tgzip	53335 bytes (52.1k)	local copy
zultra	53262 bytes (52.0k)	local copy
kzip -s0 -rn -b0	53240 bytes (52.0k)	local copy
pigz -11 -n	53236 bytes (52.0k)	local copy
Zopfli	53161 bytes (51.9k)	local copy
Zopfli (defluff)	53157 bytes (51.9k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.13.1.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.13.1 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

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 --mls64 --bsr40 --lazy --ohh

(found August 23, 2018)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	64	--mls64
block splitting recursion	40	--bsr40
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 4 more bytes (53157 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-1.13.1/dojo.js --location | md5sum
0b3b53da60ecc2a54aaac2c0abb7e282 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.1.min.zopfli.js.gz | md5sum
0b3b53da60ecc2a54aaac2c0abb7e282 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.1/dojo.js --location | sha1sum
385fac1759f40fb3edae4017d6a2702843f830bd -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.1.min.zopfli.js.gz | sha1sum
385fac1759f40fb3edae4017d6a2702843f830bd -

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
53161 bytes	-1 byte	zopfli --i1000000 --mls64 --bsr40 --lazy --ohh	August 23, 2018 @ 18:35
53162 bytes	-1 byte	zopfli --i100000 --mls8 --bsr10 --lazy --ohh	August 22, 2018 @ 17:53
53163 bytes	-6 bytes	zopfli --i100000 --mls8 --bsr14 --lazy --ohh	August 22, 2018 @ 17:12
53169 bytes	-3 bytes	zopfli --i10000 --mls8 --bsr14 --lazy --ohh	August 22, 2018 @ 15:59
53172 bytes	-2 bytes	zopfli --i1000 --mls8 --bsr14 --lazy --ohh	August 22, 2018 @ 15:51
53174 bytes	-1 byte	zopfli --i1000 --mls4 --bsr14 --lazy --ohh	August 22, 2018 @ 15:32
53175 bytes	-1 byte	zopfli --i1000 --mls64 --bsr25 --lazy --ohh	August 22, 2018 @ 15:31
53176 bytes	–	zopfli --i100 --mls64 --bsr25 --lazy --ohh	August 22, 2018 @ 15:31

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

Most recent activity on March 8, 2022 @ 10:30.

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	53170	53170	53172	53173	53172	53171	53170	53171	53171	53179	53187	53174	53182	53209	53190
4	53213	53171	53172	53172	53179	53185	53170	53172	53180	53178	53181	53182	53185	53187	53192
6	53209	53172	53171	53174	53179	53182	53170	53171	53184	53175	53188	53181	53183	53180	53179
7	53219	53203	53212	53173	53172	53172	53168	53173	53182	53186	53178	53181	53183	53189	53189
8	53205	53163	53171	53171	53171	53194	53170	53171	53182	53186	53187	53173	53187	53189	53184
9	53171	53165	53175	53171	53177	53176	53171	53170	53182	53186	53187	53174	53182	53195	53195
10	53171	53175	53162	53210	53173	53171	53185	53171	53182	53183	53199	53174	53188	53191	53188
11	53170	53165	53171	53172	53176	53174	53168	53164	53183	53186	53187	53184	53185	53187	53181
12	53171	53170	53172	53173	53175	53176	53168	53174	53182	53173	53187	53186	53183	53191	53184
13	53207	53170	53171	53174	53174	53179	53168	53172	53182	53186	53188	53185	53189	53189	53184
14	53171	53171	53163	53175	53175	53175	53168	53173	53178	53173	53198	53187	53185	53180	53178
15	53202	53170	53178	53172	53174	53174	53168	53172	53182	53186	53199	53185	53184	53189	53188
16	53211	53203	53171	53170	53171	53185	53171	53171	53179	53187	53184	53186	53183	53192	53181
17	53206	53165	53173	53165	53172	53186	53171	53183	53182	53175	53190	53173	53181	53179	53186
18	53209	53170	53172	53171	53175	53173	53168	53182	53182	53183	53184	53173	53183	53191	53180
19	53171	53165	53173	53173	53172	53199	53168	53171	53182	53186	53187	53174	53182	53192	53186
20	53207	53202	53173	53173	53176	53189	53172	53182	53183	53188	53199	53183	53181	53182	53190
21	53207	53202	53171	53173	53172	53173	53172	53165	53182	53186	53188	53186	53183	53187	53187
22	53214	53165	53172	53173	53175	53171	53168	53175	53182	53188	53198	53187	53183	53174	53179
23	53171	53172	53163	53172	53174	53174	53170	53171	53182	53186	53189	53173	53185	53190	53174
25	53203	53202	53163	53172	53170	53164	53168	53175	53182	53184	53187	53173	53184	53184	53184
30	53205	53214	53173	53172	53172	53170	53171	53172	53182	53187	53188	53173	53183	53191	53174
40	53208	53170	53168	53171	53171	53161	53172	53172	53182	53183	53198	53185	53188	53180	53187

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	53176 bytes	–	100%
1,000	53172 bytes	-4 bytes	100%
10,000	53169 bytes	-3 bytes	100%
100,000	53162 bytes	-7 bytes	8.41%
1,000,000	53161 bytes	-1 byte	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)	53240 bytes	+79 bytes (+0.15%)	–
1	53253 bytes	+92 bytes (+0.17%)	+13 bytes
2	53282 bytes	+121 bytes (+0.23%)	+42 bytes
3	53300 bytes	+139 bytes (+0.26%)	+60 bytes
4	53247 bytes	+86 bytes (+0.16%)	+7 bytes
5	53277 bytes	+116 bytes (+0.22%)	+37 bytes
6	53293 bytes	+132 bytes (+0.25%)	+53 bytes
7	53286 bytes	+125 bytes (+0.24%)	+46 bytes
8	53313 bytes	+152 bytes (+0.29%)	+73 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	39095 bytes	-14066 bytes (-26.46%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46641 bytes	-6520 bytes (-12.26%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47584 bytes	-5577 bytes (-10.49%)
Brotli (Wikipedia)	brotli	brotli -q 11	49058 bytes	-4103 bytes (-7.72%)
LZMA2 (Wikipedia)	xz	xz -9	50152 bytes	-3009 bytes (-5.66%)
Zstandard (Wikipedia)	zstd	zstd -19	51594 bytes	-1567 bytes (-2.95%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51861 bytes	-1300 bytes (-2.45%)

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.