Dojo 1.17.0 - 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)	56589 bytes (55.3k)	local copy
gzip -9	56521 bytes (55.2k)	local copy
libdeflate -12	53840 bytes (52.6k)	local copy
7zip -mx=9 -tgzip	53828 bytes (52.6k)	local copy
kzip -s0 -rn -b1	53754 bytes (52.5k)	local copy
zultra	53752 bytes (52.5k)	local copy
pigz -11 -n	53736 bytes (52.5k)	local copy
Zopfli	53661 bytes (52.4k)	local copy
Zopfli (defluff)	53660 bytes (52.4k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.17.0.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.17.0 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 --bsr23 --lazy --ohh

(found March 1, 2022)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	128	--mls128
block splitting recursion	23	--bsr23
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 (53660 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-1.17.0/dojo.js --location | md5sum
bd2f520ac7d6e3d68a48d045b505f677 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.17.0.min.zopfli.js.gz | md5sum
bd2f520ac7d6e3d68a48d045b505f677 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.17.0/dojo.js --location | sha1sum
fbc88ae82f838d8effcba6a8c9dd2a43514e91b2 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.17.0.min.zopfli.js.gz | sha1sum
fbc88ae82f838d8effcba6a8c9dd2a43514e91b2 -

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
53661 bytes	-1 byte	zopfli --i1000000 --mls128 --bsr23 --lazy --ohh	March 1, 2022 @ 20:48
53662 bytes	-1 byte	zopfli --i100000 --mls128 --bsr23 --lazy --ohh	March 1, 2022 @ 11:54
53663 bytes	-1 byte	zopfli --i10000 --mls128 --bsr40 --lazy --ohh	February 28, 2022 @ 08:46
53664 bytes	-5 bytes	zopfli --i10000 --mls64 --bsr12 --lazy --ohh	February 26, 2022 @ 03:53
53669 bytes	-4 bytes	zopfli --i10000 --mls32 --bsr9 --lazy --ohh	February 25, 2022 @ 12:38
53673 bytes	-1 byte	zopfli --i1000 --mls128 --bsr6 --lazy --ohh	February 25, 2022 @ 01:46
53674 bytes	-2 bytes	zopfli --i1000 --mls64 --bsr6 --lazy --ohh	February 24, 2022 @ 19:40
53676 bytes	–	zopfli --i100 --mls128 --bsr6 --lazy --ohh	February 24, 2022 @ 15:45

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

Most recent activity on March 2, 2022 @ 11:03.

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	53702	53705	53670	53671	53674	53668	53664	53668	53671	53667	53672	53673	53674	53698	53689
4	53701	53705	53673	53684	53681	53682	53667	53669	53678	53667	53671	53674	53681	53681	53674
6	53699	53670	53701	53668	53680	53668	53666	53676	53681	53677	53690	53676	53684	53681	53679
7	53702	53681	53704	53701	53669	53680	53674	53673	53680	53677	53690	53675	53680	53684	53680
8	53697	53695	53687	53685	53671	53680	53664	53669	53688	53677	53686	53686	53680	53682	53685
9	53696	53673	53698	53667	53669	53669	53666	53663	53681	53677	53682	53674	53680	53687	53681
10	53682	53696	53680	53699	53669	53682	53667	53670	53680	53677	53688	53675	53679	53687	53687
11	53683	53682	53684	53700	53671	53665	53664	53667	53677	53677	53682	53675	53679	53682	53679
12	53698	53698	53701	53674	53666	53664	53664	53671	53677	53677	53678	53678	53679	53679	53685
13	53694	53699	53682	53671	53670	53671	53664	53666	53680	53677	53679	53675	53679	53682	53680
14	53683	53685	53705	53708	53665	53670	53668	53666	53679	53678	53679	53674	53679	53682	53677
15	53684	53681	53681	53699	53674	53680	53669	53678	53681	53678	53682	53676	53679	53682	53681
16	53698	53697	53699	53667	53674	53682	53664	53677	53680	53677	53680	53674	53680	53678	53683
17	53700	53697	53698	53670	53674	53679	53695	53678	53678	53677	53692	53692	53679	53682	53683
18	53683	53682	53683	53695	53671	53670	53664	53671	53678	53676	53687	53687	53682	53683	53685
19	53684	53688	53683	53667	53671	53684	53664	53670	53677	53678	53688	53679	53679	53682	53679
20	53684	53686	53683	53670	53668	53669	53686	53677	53679	53677	53686	53673	53680	53685	53684
21	53695	53699	53697	53702	53666	53664	53666	53667	53677	53677	53687	53686	53679	53680	53679
22	53682	53681	53705	53672	53670	53680	53664	53677	53678	53677	53690	53678	53679	53681	53680
23	53684	53693	53682	53670	53669	53681	53661	53665	53680	53677	53684	53691	53679	53681	53681
25	53695	53695	53692	53703	53669	53681	53697	53666	53680	53679	53688	53682	53681	53681	53678
30	53698	53703	53693	53705	53669	53679	53664	53677	53679	53677	53684	53665	53678	53681	53678
40	53699	53703	53695	53703	53669	53680	53663	53669	53681	53677	53690	53688	53678	53684	53684

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	53663 bytes	-10 bytes	100%
100,000	53662 bytes	-1 byte	0.87%
1,000,000	53661 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)	53833 bytes	+172 bytes (+0.32%)	+79 bytes
1	53754 bytes	+93 bytes (+0.17%)	–
2	53776 bytes	+115 bytes (+0.21%)	+22 bytes
3	53799 bytes	+138 bytes (+0.26%)	+45 bytes
4	53840 bytes	+179 bytes (+0.33%)	+86 bytes
5	53868 bytes	+207 bytes (+0.39%)	+114 bytes
6	53896 bytes	+235 bytes (+0.44%)	+142 bytes
7	53909 bytes	+248 bytes (+0.46%)	+155 bytes
8	53907 bytes	+246 bytes (+0.46%)	+153 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	-14221 bytes (-26.50%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	47084 bytes	-6577 bytes (-12.26%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	48028 bytes	-5633 bytes (-10.50%)
Brotli (Wikipedia)	brotli	brotli -q 11	49538 bytes	-4123 bytes (-7.68%)
LZMA2 (Wikipedia)	xz	xz -9	50612 bytes	-3049 bytes (-5.68%)
Zstandard (Wikipedia)	zstd	zstd -19	51964 bytes	-1697 bytes (-3.16%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	52295 bytes	-1366 bytes (-2.55%)

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.