Dojo 1.17.1 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 642546 bytes (627.5k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 168845 bytes (164.9k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	56588 bytes (55.3k)	local copy
gzip -9	56520 bytes (55.2k)	local copy
libdeflate -12	53839 bytes (52.6k)	local copy
7zip -mx=9 -tgzip	53827 bytes (52.6k)	local copy
kzip -s0 -rn -b1	53754 bytes (52.5k)	local copy
zultra	53751 bytes (52.5k)	local copy
pigz -11 -n	53734 bytes (52.5k)	local copy
Zopfli	53658 bytes (52.4k)	local copy
Zopfli (defluff)	53656 bytes (52.4k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.17.1.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.17.1 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 --mls128 --bsr6 --lazy --ohh

(found March 21, 2022)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	128	--mls128
block splitting recursion	6	--bsr6
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 (53656 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-1.17.1/dojo.js --location | md5sum
f42a4d727eda6fe51fcc2ee33c7564c8 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.17.1.min.zopfli.js.gz | md5sum
f42a4d727eda6fe51fcc2ee33c7564c8 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.17.1/dojo.js --location | sha1sum
e6c01ec3c87a76d89d9722e07cd9834965efc928 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.17.1.min.zopfli.js.gz | sha1sum
e6c01ec3c87a76d89d9722e07cd9834965efc928 -

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
53658 bytes	-2 bytes	zopfli --i1000000 --mls128 --bsr6 --lazy --ohh	March 21, 2022 @ 23:36
53660 bytes	-5 bytes	zopfli --i100000 --mls128 --bsr6 --lazy --ohh	March 21, 2022 @ 11:42
53665 bytes	-8 bytes	zopfli --i10000 --mls128 --bsr6 --lazy --ohh	March 21, 2022 @ 10:52
53673 bytes	-1 byte	zopfli --i1000 --mls128 --bsr6 --lazy --ohh	March 21, 2022 @ 10:46
53674 bytes	-2 bytes	zopfli --i1000 --mls256 --bsr8 --lazy --ohh	March 21, 2022 @ 10:46
53676 bytes	–	zopfli --i100 --mls128 --bsr6 --lazy --ohh	March 21, 2022 @ 10:35

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

Most recent activity on March 22, 2022 @ 08:45.

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	53701	53704	53669	53670	53668	53671	53670	53670	53666	53666	53671	53668	53673	53697	53688
4	53700	53704	53674	53683	53700	53681	53665	53664	53677	53665	53670	53673	53680	53679	53676
6	53698	53669	53700	53667	53675	53667	53658	53676	53680	53676	53688	53677	53682	53679	53678
7	53701	53680	53703	53700	53668	53679	53673	53674	53680	53677	53689	53668	53679	53683	53679
8	53696	53693	53686	53684	53669	53679	53662	53669	53687	53676	53685	53684	53679	53680	53685
9	53695	53672	53702	53666	53670	53668	53665	53663	53680	53676	53682	53685	53680	53686	53679
10	53681	53694	53678	53697	53664	53681	53666	53669	53679	53676	53687	53674	53678	53690	53685
11	53682	53681	53683	53699	53670	53661	53663	53666	53676	53676	53680	53671	53678	53681	53679
12	53697	53697	53700	53673	53663	53663	53663	53669	53676	53677	53677	53677	53678	53678	53684
13	53692	53698	53681	53680	53667	53670	53663	53665	53678	53676	53678	53671	53678	53681	53679
14	53682	53684	53705	53707	53665	53668	53667	53665	53678	53678	53678	53673	53678	53681	53676
15	53682	53682	53680	53697	53673	53677	53668	53677	53681	53677	53681	53676	53677	53681	53682
16	53697	53696	53697	53666	53673	53681	53663	53677	53677	53676	53678	53673	53678	53677	53681
17	53699	53696	53697	53669	53673	53677	53679	53677	53677	53676	53691	53691	53678	53680	53683
18	53681	53681	53682	53694	53670	53668	53663	53670	53677	53676	53686	53687	53681	53682	53685
19	53683	53688	53682	53670	53668	53682	53663	53669	53677	53677	53687	53678	53678	53681	53678
20	53683	53685	53682	53670	53668	53667	53685	53676	53678	53677	53686	53678	53678	53686	53685
21	53694	53698	53696	53700	53664	53663	53667	53668	53676	53677	53687	53685	53678	53679	53680
22	53681	53680	53703	53673	53667	53678	53663	53676	53679	53676	53690	53677	53678	53680	53681
23	53683	53692	53681	53668	53669	53679	53661	53664	53680	53676	53683	53691	53678	53680	53680
25	53694	53694	53691	53702	53670	53679	53681	53666	53679	53678	53687	53679	53679	53680	53677
30	53696	53703	53687	53704	53668	53678	53663	53676	53678	53676	53683	53664	53676	53679	53678
40	53698	53702	53694	53701	53667	53678	53662	53669	53680	53676	53689	53687	53677	53683	53683

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	53676 bytes	–	100%
1,000	53673 bytes	-3 bytes	100%
10,000	53662 bytes	-11 bytes	100%
100,000	53660 bytes	-2 bytes	1.74%
1,000,000	53658 bytes	-2 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)	53827 bytes	+169 bytes (+0.31%)	+73 bytes
1	53754 bytes	+96 bytes (+0.18%)	–
2	53761 bytes	+103 bytes (+0.19%)	+7 bytes
3	53793 bytes	+135 bytes (+0.25%)	+39 bytes
4	53815 bytes	+157 bytes (+0.29%)	+61 bytes
5	53845 bytes	+187 bytes (+0.35%)	+91 bytes
6	53889 bytes	+231 bytes (+0.43%)	+135 bytes
7	53909 bytes	+251 bytes (+0.47%)	+155 bytes
8	53893 bytes	+235 bytes (+0.44%)	+139 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	39440 bytes	-14218 bytes (-26.50%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	47084 bytes	-6574 bytes (-12.25%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	48028 bytes	-5630 bytes (-10.49%)
Brotli (Wikipedia)	brotli	brotli -q 11	49583 bytes	-4075 bytes (-7.59%)
LZMA2 (Wikipedia)	xz	xz -9	50624 bytes	-3034 bytes (-5.65%)
Zstandard (Wikipedia)	zstd	zstd -19	51962 bytes	-1696 bytes (-3.16%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	52294 bytes	-1364 bytes (-2.54%)

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.