Dojo 1.7.12 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 566328 bytes (553.1k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 141104 bytes (137.8k, 25%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	48308 bytes (47.2k)	local copy
gzip -9	48273 bytes (47.1k)	local copy
7zip -mx=9 -tgzip	46018 bytes (44.9k)	local copy
libdeflate -12	45961 bytes (44.9k)	local copy
kzip -s0 -rn -b1	45930 bytes (44.9k)	local copy
pigz -11 -n	45916 bytes (44.8k)	local copy
zultra	45881 bytes (44.8k)	local copy
Zopfli	45825 bytes (44.8k)	local copy
Zopfli (defluff)	45823 bytes (44.7k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.7.12.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.7.12 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 --i1000000 --mb8 --mls16384 --bsr10 --lazy --ohh

(found October 4, 2018)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	16384	--mls16384
block splitting recursion	10	--bsr10
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 (45823 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-1.7.12/dojo.js --location | md5sum
01b4cccdfe8594783f66ae75fedb5d48 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.12.min.zopfli.js.gz | md5sum
01b4cccdfe8594783f66ae75fedb5d48 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.7.12/dojo.js --location | sha1sum
511b6b9a560350121026180b203e409440a21576 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.12.min.zopfli.js.gz | sha1sum
511b6b9a560350121026180b203e409440a21576 -

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
45825 bytes	-1 byte	zopfli --i1000000 --mls16384 --bsr10 --lazy --ohh	October 4, 2018 @ 20:50
45826 bytes	-3 bytes	zopfli --i100000 --mls16384 --bsr10 --lazy --ohh	October 4, 2018 @ 13:16
45829 bytes	-1 byte	zopfli --i100000 --mls4 --bsr22 --lazy --ohh	October 4, 2018 @ 12:37
45830 bytes	-1 byte	zopfli --i10000 --mls4 --bsr22 --lazy --ohh	October 3, 2018 @ 04:50
45831 bytes	-1 byte	zopfli --i10000 --mls4 --bsr10 --lazy --ohh	October 3, 2018 @ 04:41
45832 bytes	-5 bytes	zopfli --i10000 --mls512 --bsr13 --lazy --ohh	October 3, 2018 @ 02:30
45837 bytes	-6 bytes	zopfli --i1000 --mls32 --bsr12 --lazy --ohh	October 2, 2018 @ 19:04
45843 bytes	-2 bytes	zopfli --i1000 --mls2 --bsr22 --lazy --ohh	October 2, 2018 @ 19:01
45845 bytes	–	zopfli --i100 --mls4 --bsr22 --lazy --ohh	October 2, 2018 @ 11:44

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	45847	45842	45844	45843	45845	45842	45841	45841	45842	45858	45839	45839	45862	45854	45852
4	45834	45831	45835	45837	45838	45840	45846	45838	45842	45852	45845	45845	45845	45838	45841
6	45853	45855	45837	45832	45839	45840	45854	45840	45840	45849	45848	45841	45852	45844	45848
7	45832	45836	45836	45837	45846	45840	45850	45856	45840	45846	45847	45856	45859	45834	45853
8	45835	45838	45838	45838	45838	45856	45845	45839	45856	45848	45855	45855	45862	45841	45843
9	45835	45835	45848	45850	45847	45858	45846	45854	45855	45846	45860	45856	45855	45842	45832
10	45837	45831	45838	45835	45838	45860	45849	45848	45857	45851	45852	45847	45857	45825	45832
11	45833	45837	45836	45839	45836	45838	45844	45839	45837	45847	45850	45855	45861	45832	45841
12	45839	45835	45835	45838	45833	45856	45847	45834	45854	45846	45851	45857	45857	45833	45833
13	45835	45840	45838	45847	45836	45840	45849	45837	45832	45852	45859	45837	45857	45832	45833
14	45836	45834	45836	45833	45844	45855	45847	45856	45839	45853	45850	45839	45857	45837	45843
15	45838	45838	45835	45837	45848	45839	45847	45841	45854	45846	45849	45836	45858	45833	45832
16	45836	45835	45833	45838	45845	45847	45847	45840	45855	45846	45846	45856	45856	45832	45832
17	45832	45836	45834	45836	45844	45848	45846	45841	45841	45845	45861	45853	45857	45834	45832
18	45836	45838	45832	45832	45836	45840	45849	45840	45857	45846	45856	45841	45856	45838	45852
19	45836	45838	45836	45837	45839	45856	45843	45835	45856	45846	45856	45839	45861	45839	45837
20	45837	45836	45834	45833	45846	45840	45847	45859	45855	45846	45856	45837	45857	45838	45838
21	45834	45832	45836	45857	45836	45840	45853	45846	45837	45847	45849	45857	45856	45837	45837
22	45837	45829	45838	45839	45844	45846	45847	45849	45855	45846	45846	45844	45857	45845	45832
23	45841	45836	45837	45837	45845	45860	45849	45841	45837	45848	45846	45848	45860	45833	45833
25	45832	45837	45839	45845	45845	45852	45845	45840	45858	45854	45857	45846	45860	45838	45838
30	45833	45833	45834	45848	45846	45856	45847	45839	45856	45845	45850	45836	45857	45832	45834
40	45834	45834	45836	45836	45836	45840	45850	45840	45858	45848	45859	45837	45857	45832	45832

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	45845 bytes	–	100%
1,000	45837 bytes	-8 bytes	100%
10,000	45830 bytes	-7 bytes	100%
100,000	45826 bytes	-4 bytes	0.58%
1,000,000	45825 bytes	-1 byte	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)	45966 bytes	+141 bytes (+0.31%)	+36 bytes
1	45930 bytes	+105 bytes (+0.23%)	–
2	45956 bytes	+131 bytes (+0.29%)	+26 bytes
3	45970 bytes	+145 bytes (+0.32%)	+40 bytes
4	45995 bytes	+170 bytes (+0.37%)	+65 bytes
5	46004 bytes	+179 bytes (+0.39%)	+74 bytes
6	46010 bytes	+185 bytes (+0.40%)	+80 bytes
7	46048 bytes	+223 bytes (+0.49%)	+118 bytes
8	46059 bytes	+234 bytes (+0.51%)	+129 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	34383 bytes	-11442 bytes (-24.97%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	40556 bytes	-5269 bytes (-11.50%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	41377 bytes	-4448 bytes (-9.71%)
Brotli (Wikipedia)	brotli	brotli -q 11	42452 bytes	-3373 bytes (-7.36%)
LZMA2 (Wikipedia)	xz	xz -9	43472 bytes	-2353 bytes (-5.13%)
Zstandard (Wikipedia)	zstd	zstd -19	44640 bytes	-1185 bytes (-2.59%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	44906 bytes	-919 bytes (-2.01%)

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.