Dojo 1.12.1 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 631595 bytes (616.8k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165082 bytes (161.2k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	55659 bytes (54.4k)	local copy
gzip -9	55605 bytes (54.3k)	local copy
libdeflate -12	52949 bytes (51.7k)	local copy
7zip -mx=9 -tgzip	52915 bytes (51.7k)	local copy
zultra	52871 bytes (51.6k)	local copy
kzip -s0 -rn -b1	52870 bytes (51.6k)	local copy
pigz -11 -n	52869 bytes (51.6k)	local copy
Zopfli	52778 bytes (51.5k)	local copy
Zopfli (defluff)	52775 bytes (51.5k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.12.1.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.12.1 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 --i100000 --mb8 --mls32 --bsr15 --lazy --ohh

(found January 25, 2017)

Description	Value	Parameter
iterations	100000	--i100000
maximum blocks	8	--mb8
maximum length score	32	--mls32
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 3 more bytes (52775 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-1.12.1/dojo.js --location | md5sum
b42e40f99a835ae2041220f3c7bdbe2f -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.1.min.zopfli.js.gz | md5sum
b42e40f99a835ae2041220f3c7bdbe2f -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.1/dojo.js --location | sha1sum
38a5318b1a53752f2a547b4f722aa9fabf52c299 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.1.min.zopfli.js.gz | sha1sum
38a5318b1a53752f2a547b4f722aa9fabf52c299 -

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
52778 bytes	-1 byte	zopfli --i100000 --mls32 --bsr15 --lazy --ohh	January 25, 2017 @ 15:07
52779 bytes	-6 bytes	zopfli --i100000 --mls16 --bsr10 --lazy --ohh	January 25, 2017 @ 12:47
52785 bytes	-2 bytes	zopfli --i10000 --mls16 --bsr10 --lazy --ohh	January 25, 2017 @ 12:08
52787 bytes	-5 bytes	zopfli --i10000 --mls64 --bsr13 --lazy --ohh	January 25, 2017 @ 12:05
52792 bytes	-1 byte	zopfli --i10000 --mls32 --bsr23 --lazy --ohh	January 25, 2017 @ 12:02
52793 bytes	-2 bytes	zopfli --i1000 --mls64 --bsr13 --lazy --ohh	January 25, 2017 @ 11:56
52795 bytes	-5 bytes	zopfli --i1000 --mls32 --bsr10 --lazy --ohh	January 25, 2017 @ 11:56
52800 bytes	–	zopfli --i100 --mls32 --bsr10 --lazy --ohh	January 25, 2017 @ 11:54

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

Most recent activity on March 17, 2022 @ 17:22.

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	52789	52790	52790	52792	52790	52787	52788	52797	52793	52793	52797	52792	52797	52816	52817
4	52828	52790	52792	52802	52790	52791	52792	52793	52801	52793	52795	52796	52795	52795	52799
6	52823	52789	52791	52789	52790	52800	52799	52798	52805	52797	52795	52788	52792	52800	52807
7	52792	52819	52822	52826	52804	52788	52781	52791	52788	52796	52804	52789	52792	52798	52806
8	52821	52789	52786	52786	52792	52788	52791	52790	52798	52799	52796	52795	52796	52797	52801
9	52791	52815	52792	52820	52778	52791	52778	52791	52803	52796	52793	52796	52793	52800	52801
10	52792	52821	52818	52779	52788	52796	52787	52791	52792	52797	52793	52793	52792	52800	52801
11	52791	52792	52790	52792	52779	52790	52790	52786	52799	52796	52795	52792	52792	52793	52811
12	52823	52820	52792	52821	52787	52790	52783	52792	52801	52797	52792	52796	52792	52791	52804
13	52821	52821	52792	52789	52802	52787	52781	52790	52800	52797	52793	52795	52792	52801	52798
14	52791	52818	52780	52789	52788	52786	52793	52788	52792	52796	52799	52795	52792	52801	52799
15	52823	52821	52790	52822	52778	52789	52791	52791	52792	52796	52798	52793	52793	52793	52793
16	52818	52820	52821	52789	52791	52790	52790	52791	52806	52799	52790	52795	52798	52801	52801
17	52822	52814	52786	52790	52788	52790	52789	52792	52799	52795	52795	52797	52795	52799	52798
18	52792	52822	52792	52823	52779	52791	52790	52790	52809	52795	52797	52793	52799	52792	52801
19	52791	52790	52780	52822	52787	52790	52790	52786	52799	52795	52795	52793	52800	52801	52801
20	52822	52819	52788	52786	52779	52791	52789	52791	52800	52797	52796	52790	52794	52801	52798
21	52822	52817	52791	52822	52779	52788	52787	52790	52801	52796	52789	52795	52792	52800	52801
22	52820	52819	52784	52821	52779	52790	52791	52793	52792	52797	52795	52792	52796	52793	52801
23	52822	52822	52786	52789	52792	52790	52787	52792	52799	52795	52791	52793	52793	52794	52801
25	52825	52791	52789	52794	52787	52794	52787	52791	52801	52796	52795	52795	52791	52793	52801
30	52823	52823	52790	52789	52779	52790	52790	52791	52799	52799	52796	52797	52793	52803	52801
40	52822	52814	52779	52792	52789	52784	52790	52794	52800	52795	52791	52794	52793	52801	52804

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	52800 bytes	–	100%
1,000	52793 bytes	-7 bytes	100%
10,000	52784 bytes	-9 bytes	100%
100,000	52778 bytes	-6 bytes	5.80%
1,000,000	52778 bytes	–	0.87%
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)	52954 bytes	+176 bytes (+0.33%)	+84 bytes
1	52870 bytes	+92 bytes (+0.17%)	–
2	52877 bytes	+99 bytes (+0.19%)	+7 bytes
3	52919 bytes	+141 bytes (+0.27%)	+49 bytes
4	52954 bytes	+176 bytes (+0.33%)	+84 bytes
5	52995 bytes	+217 bytes (+0.41%)	+125 bytes
6	53013 bytes	+235 bytes (+0.45%)	+143 bytes
7	53060 bytes	+282 bytes (+0.53%)	+190 bytes
8	53074 bytes	+296 bytes (+0.56%)	+204 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	38855 bytes	-13923 bytes (-26.38%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46347 bytes	-6431 bytes (-12.19%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47199 bytes	-5579 bytes (-10.57%)
Brotli (Wikipedia)	brotli	brotli -q 11	48789 bytes	-3989 bytes (-7.56%)
LZMA2 (Wikipedia)	xz	xz -9	49820 bytes	-2958 bytes (-5.60%)
Zstandard (Wikipedia)	zstd	zstd -19	51312 bytes	-1466 bytes (-2.78%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51489 bytes	-1289 bytes (-2.44%)

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.