Dojo 1.7.9 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 565918 bytes (552.7k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 140959 bytes (137.7k, 25%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	48264 bytes (47.1k)	local copy
gzip -9	48225 bytes (47.1k)	local copy
7zip -mx=9 -tgzip	45971 bytes (44.9k)	local copy
libdeflate -12	45914 bytes (44.8k)	local copy
kzip -s0 -rn -b1	45881 bytes (44.8k)	local copy
pigz -11 -n	45858 bytes (44.8k)	local copy
zultra	45835 bytes (44.8k)	local copy
Zopfli	45780 bytes (44.7k)	local copy
Zopfli (defluff)	45778 bytes (44.7k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.7.9.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.7.9 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 --mls16384 --bsr10 --lazy --ohh

(found March 25, 2016)

Description	Value	Parameter
iterations	100000	--i100000
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 (45778 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-1.7.9/dojo.js --location | md5sum
0ddaa460eddb578125f73560e83bf559 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.9.min.zopfli.js.gz | md5sum
0ddaa460eddb578125f73560e83bf559 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.7.9/dojo.js --location | sha1sum
6eb9cd78a51e73f19b99c57a68c1e1f226284ede -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.9.min.zopfli.js.gz | sha1sum
6eb9cd78a51e73f19b99c57a68c1e1f226284ede -

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
45780 bytes	-2 bytes	zopfli --i100000 --mls16384 --bsr10 --lazy --ohh	March 25, 2016 @ 10:35
45782 bytes	-1 byte	zopfli --i100000 --mls32768 --bsr10 --lazy --ohh	March 24, 2016 @ 17:09
45783 bytes	-1 byte	zopfli --i100000 --mls256 --bsr12 --lazy --ohh	March 24, 2016 @ 15:12
45784 bytes	-2 bytes	zopfli --i100000 --mls4 --bsr21 --lazy --ohh	March 24, 2016 @ 14:24
45786 bytes	-1 byte	zopfli --i10000 --mls256 --bsr12 --lazy --ohh	March 24, 2016 @ 11:44
45787 bytes	-4 bytes	zopfli --i10000 --mls32768 --bsr23 --lazy --ohh	March 24, 2016 @ 11:39
45791 bytes	-1 byte	zopfli --i1000 --mls256 --bsr12 --lazy --ohh	March 24, 2016 @ 11:23
45792 bytes	-9 bytes	zopfli --i1000 --mls32 --bsr12 --lazy --ohh	March 24, 2016 @ 11:19
45801 bytes	–	zopfli --i100 --mls4 --bsr25 --lazy --ohh	March 24, 2016 @ 11:05

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 @ 12:52.

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	45802	45799	45800	45799	45804	45800	45798	45796	45797	45812	45793	45795	45816	45808	45813
4	45789	45787	45791	45792	45795	45797	45800	45797	45796	45806	45803	45801	45798	45801	45790
6	45808	45808	45792	45794	45795	45796	45811	45796	45796	45803	45806	45793	45809	45803	45802
7	45790	45790	45790	45792	45791	45810	45801	45796	45795	45801	45807	45803	45808	45807	45808
8	45792	45793	45792	45792	45792	45794	45798	45812	45812	45802	45811	45807	45818	45803	45802
9	45791	45790	45803	45804	45802	45794	45800	45794	45811	45800	45803	45807	45818	45804	45786
10	45792	45787	45793	45790	45794	45810	45803	45794	45812	45805	45807	45801	45818	45780	45782
11	45790	45794	45795	45798	45792	45792	45803	45793	45791	45805	45809	45812	45815	45787	45796
12	45788	45787	45792	45795	45787	45811	45801	45783	45812	45801	45809	45809	45810	45797	45786
13	45791	45794	45791	45794	45792	45793	45803	45791	45791	45807	45810	45807	45813	45787	45787
14	45790	45790	45790	45787	45792	45811	45801	45806	45796	45807	45807	45795	45811	45791	45798
15	45791	45792	45793	45792	45799	45794	45801	45797	45795	45800	45807	45798	45812	45786	45787
16	45790	45789	45790	45792	45798	45801	45801	45794	45811	45800	45804	45792	45812	45786	45800
17	45791	45790	45791	45791	45805	45807	45801	45796	45804	45800	45812	45795	45815	45787	45786
18	45792	45794	45789	45793	45792	45794	45803	45794	45810	45800	45804	45795	45810	45789	45813
19	45792	45792	45790	45803	45794	45810	45799	45796	45811	45801	45804	45793	45812	45792	45803
20	45790	45790	45790	45793	45804	45794	45801	45792	45810	45801	45804	45792	45807	45793	45795
21	45790	45784	45792	45812	45792	45794	45807	45792	45808	45802	45808	45811	45816	45792	45793
22	45792	45787	45790	45793	45794	45801	45801	45798	45801	45800	45803	45799	45813	45800	45786
23	45792	45790	45793	45792	45800	45803	45804	45794	45791	45804	45804	45798	45813	45791	45787
25	45790	45792	45793	45800	45806	45800	45799	45797	45802	45801	45810	45804	45817	45798	45794
30	45790	45787	45791	45805	45805	45810	45800	45795	45810	45801	45803	45792	45817	45789	45792
40	45791	45790	45791	45797	45793	45794	45804	45794	45814	45804	45807	45809	45814	45795	45796

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	45801 bytes	–	100%
1,000	45791 bytes	-10 bytes	100%
10,000	45785 bytes	-6 bytes	100%
100,000	45780 bytes	-5 bytes	1.16%
1,000,000	45780 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)	45922 bytes	+142 bytes (+0.31%)	+41 bytes
1	45881 bytes	+101 bytes (+0.22%)	–
2	45922 bytes	+142 bytes (+0.31%)	+41 bytes
3	45930 bytes	+150 bytes (+0.33%)	+49 bytes
4	45956 bytes	+176 bytes (+0.38%)	+75 bytes
5	45967 bytes	+187 bytes (+0.41%)	+86 bytes
6	45971 bytes	+191 bytes (+0.42%)	+90 bytes
7	46008 bytes	+228 bytes (+0.50%)	+127 bytes
8	46026 bytes	+246 bytes (+0.54%)	+145 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	34361 bytes	-11419 bytes (-24.94%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	40522 bytes	-5258 bytes (-11.49%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	41344 bytes	-4436 bytes (-9.69%)
Brotli (Wikipedia)	brotli	brotli -q 11	42367 bytes	-3413 bytes (-7.46%)
LZMA2 (Wikipedia)	xz	xz -9	43432 bytes	-2348 bytes (-5.13%)
Zstandard (Wikipedia)	zstd	zstd -19	44704 bytes	-1076 bytes (-2.35%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	44878 bytes	-902 bytes (-1.97%)

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.