Dojo 1.12.3 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 633626 bytes (618.8k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165718 bytes (161.8k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	55840 bytes (54.5k)	local copy
gzip -9	55789 bytes (54.5k)	local copy
libdeflate -12	53131 bytes (51.9k)	local copy
7zip -mx=9 -tgzip	53114 bytes (51.9k)	local copy
zultra	53055 bytes (51.8k)	local copy
pigz -11 -n	53042 bytes (51.8k)	local copy
kzip -s0 -rn -b1	53030 bytes (51.8k)	local copy
Zopfli	52936 bytes (51.7k)	local copy
Zopfli (defluff)	52935 bytes (51.7k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.12.3.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.12.3 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 --i1000000 --mb8 --mls64 --bsr40 --lazy --ohh

(found March 17, 2022)

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 1 more byte (52935 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-1.12.3/dojo.js --location | md5sum
ed783c706a5ff45b4be8dc4228d8d275 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.3.min.zopfli.js.gz | md5sum
ed783c706a5ff45b4be8dc4228d8d275 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.3/dojo.js --location | sha1sum
fa9816c81fa81f135d3cdb066ae871e332cc3c3d -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.3.min.zopfli.js.gz | sha1sum
fa9816c81fa81f135d3cdb066ae871e332cc3c3d -

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
52936 bytes	-1 byte	zopfli --i1000000 --mls64 --bsr40 --lazy --ohh	March 17, 2022 @ 17:20
52937 bytes	-4 bytes	zopfli --i100000 --mls8 --bsr23 --lazy --ohh	November 29, 2017 @ 07:29
52941 bytes	-1 byte	zopfli --i100000 --mls8 --bsr12 --lazy --ohh	November 29, 2017 @ 07:27
52942 bytes	-2 bytes	zopfli --i10000 --mls8 --bsr12 --lazy --ohh	November 28, 2017 @ 14:41
52944 bytes	-3 bytes	zopfli --i10000 --mls2 --bsr25 --lazy --ohh	November 28, 2017 @ 14:35
52947 bytes	-5 bytes	zopfli --i10000 --mls4 --bsr14 --lazy --ohh	November 28, 2017 @ 14:30
52952 bytes	-1 byte	zopfli --i1000 --mls4 --bsr14 --lazy --ohh	November 28, 2017 @ 12:59
52953 bytes	-2 bytes	zopfli --i1000 --mls8 --bsr15 --lazy --ohh	November 28, 2017 @ 12:56
52955 bytes	–	zopfli --i100 --mls256 --bsr8 --lazy --ohh	November 28, 2017 @ 12:49

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

Most recent activity on March 18, 2022 @ 18:00.

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	52945	52945	52946	52947	52946	52949	52950	52951	52949	52960	52966	52947	52958	52983	52973
4	52945	52945	52950	52955	52961	52950	52949	52944	52949	52953	52955	52949	52956	52962	52958
6	52949	52944	52946	52946	52956	52949	52948	52944	52952	52952	52974	52952	52952	52962	52954
7	52983	52987	52986	52961	52943	52952	52948	52948	52955	52950	52972	52954	52953	52976	52955
8	52945	52979	52943	52947	52946	52963	52949	52944	52955	52951	52958	52956	52955	52957	52958
9	52937	52981	52947	52948	52948	52948	52938	52945	52953	52955	52957	52954	52953	52960	52955
10	52979	52980	52945	52960	52962	52949	52948	52943	52953	52951	52973	52945	52951	52963	52954
11	52950	52977	52945	52952	52951	52960	52948	52943	52950	52956	52958	52954	52953	52962	52957
12	52945	52943	52941	52961	52950	52947	52948	52949	52954	52953	52956	52947	52957	52963	52957
13	52944	52980	52948	52946	52948	52951	52948	52945	52952	52955	52956	52954	52952	52962	52954
14	52945	52947	52982	52950	52948	52948	52948	52951	52954	52953	52971	52953	52954	52966	52971
15	52944	52980	52941	52952	52946	52944	52938	52946	52955	52950	52971	52957	52953	52974	52954
16	52945	52981	52943	52984	52949	52944	52947	52943	52952	52955	52954	52954	52953	52967	52955
17	52945	52980	52942	52947	52947	52967	52947	52954	52955	52952	52958	52947	52967	52961	52955
18	52944	52978	52941	52944	52944	52948	52948	52945	52948	52953	52972	52954	52958	52964	52953
19	52947	52982	52943	52946	52961	52949	52948	52944	52946	52971	52956	52951	52961	52963	52954
20	52947	52945	52943	52945	52945	52948	52949	52954	52953	52953	52956	52949	52953	52953	52959
21	52978	52980	52941	52945	52945	52949	52948	52945	52953	52956	52974	52954	52958	52964	52955
22	52981	52981	52938	52946	52944	52943	52948	52949	52952	52955	52972	52953	52953	52966	52953
23	52947	52980	52937	52946	52951	52944	52943	52955	52952	52957	52957	52945	52952	52963	52952
25	52944	52982	52950	52945	52950	52944	52957	52954	52952	52953	52955	52955	52961	52962	52954
30	52944	52943	52943	52946	52948	52938	52948	52945	52946	52955	52956	52954	52954	52963	52955
40	52944	52980	52943	52946	52949	52936	52957	52944	52955	52953	52971	52954	52955	52960	52955

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	52955 bytes	–	100%
1,000	52952 bytes	-3 bytes	100%
10,000	52942 bytes	-10 bytes	100%
100,000	52937 bytes	-5 bytes	4.64%
1,000,000	52936 bytes	-1 byte	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)	53101 bytes	+165 bytes (+0.31%)	+71 bytes
1	53030 bytes	+94 bytes (+0.18%)	–
2	53049 bytes	+113 bytes (+0.21%)	+19 bytes
3	53103 bytes	+167 bytes (+0.32%)	+73 bytes
4	53133 bytes	+197 bytes (+0.37%)	+103 bytes
5	53179 bytes	+243 bytes (+0.46%)	+149 bytes
6	53201 bytes	+265 bytes (+0.50%)	+171 bytes
7	53245 bytes	+309 bytes (+0.58%)	+215 bytes
8	53264 bytes	+328 bytes (+0.62%)	+234 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	38921 bytes	-14015 bytes (-26.48%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46455 bytes	-6481 bytes (-12.24%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47411 bytes	-5525 bytes (-10.44%)
Brotli (Wikipedia)	brotli	brotli -q 11	48899 bytes	-4037 bytes (-7.63%)
LZMA2 (Wikipedia)	xz	xz -9	49976 bytes	-2960 bytes (-5.59%)
Zstandard (Wikipedia)	zstd	zstd -19	51551 bytes	-1385 bytes (-2.62%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51616 bytes	-1320 bytes (-2.49%)

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.