Dojo 1.17.3 (latest) - 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
zultra	53752 bytes (52.5k)	local copy
kzip -s0 -rn -b1	53750 bytes (52.5k)	local copy
pigz -11 -n	53736 bytes (52.5k)	local copy
Zopfli	53661 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-1.17.3.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.17.3 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 --mls128 --bsr8 --lazy --ohh

(found August 22, 2022)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	128	--mls128
block splitting recursion	8	--bsr8
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 5 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-1.17.3/dojo.js --location | md5sum
4860b118960dc39c555583b6f1078189 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.17.3.min.zopfli.js.gz | md5sum
4860b118960dc39c555583b6f1078189 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.17.3/dojo.js --location | sha1sum
e71018f0d89db642fa4f3b342278c73bd95dfdb8 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.17.3.min.zopfli.js.gz | sha1sum
e71018f0d89db642fa4f3b342278c73bd95dfdb8 -

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 --bsr8 --lazy --ohh	August 22, 2022 @ 16:05
53662 bytes	-2 bytes	zopfli --i100000 --mls64 --bsr6 --lazy --ohh	August 19, 2022 @ 15:37
53664 bytes	-4 bytes	zopfli --i10000 --mls32 --bsr10 --lazy --ohh	August 19, 2022 @ 15:26
53668 bytes	-6 bytes	zopfli --i10000 --mls64 --bsr6 --lazy --ohh	August 19, 2022 @ 15:02
53674 bytes	-1 byte	zopfli --i1000 --mls64 --bsr6 --lazy --ohh	August 19, 2022 @ 14:43
53675 bytes	-1 byte	zopfli --i1000 --mls32 --bsr10 --lazy --ohh	August 19, 2022 @ 14:37
53676 bytes	-2 bytes	zopfli --i1000 --mls32 --bsr23 --lazy --ohh	August 19, 2022 @ 14:37
53678 bytes	–	zopfli --i100 --mls32 --bsr23 --lazy --ohh	August 19, 2022 @ 14:33

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

Most recent activity on August 23, 2022 @ 10:40.

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	53706	53670	53670	53674	53668	53666	53669	53671	53667	53672	53668	53674	53698	53689
4	53693	53705	53674	53683	53681	53682	53667	53666	53678	53667	53674	53674	53678	53680	53676
6	53699	53669	53701	53670	53676	53662	53666	53677	53681	53677	53689	53675	53682	53681	53679
7	53702	53681	53704	53701	53670	53676	53674	53673	53680	53678	53691	53675	53680	53684	53678
8	53697	53693	53687	53684	53670	53680	53661	53670	53686	53677	53686	53686	53680	53681	53686
9	53695	53675	53674	53671	53669	53669	53668	53663	53681	53677	53682	53671	53681	53687	53681
10	53682	53696	53679	53699	53664	53682	53669	53669	53680	53677	53687	53675	53679	53692	53686
11	53684	53682	53684	53701	53670	53664	53665	53667	53677	53677	53681	53674	53678	53682	53680
12	53698	53698	53701	53674	53669	53665	53665	53670	53677	53677	53678	53678	53679	53680	53686
13	53693	53699	53682	53672	53670	53671	53665	53666	53678	53677	53678	53675	53679	53682	53680
14	53683	53684	53705	53708	53666	53668	53669	53667	53679	53678	53679	53674	53679	53682	53677
15	53684	53683	53681	53699	53672	53679	53668	53678	53681	53678	53682	53678	53678	53682	53681
16	53698	53697	53698	53667	53672	53681	53665	53678	53678	53677	53680	53674	53679	53678	53683
17	53700	53697	53698	53669	53672	53679	53680	53678	53678	53677	53691	53692	53679	53681	53686
18	53683	53682	53683	53695	53668	53680	53665	53671	53678	53677	53687	53688	53680	53684	53687
19	53684	53689	53683	53667	53671	53683	53664	53669	53678	53678	53688	53679	53679	53682	53679
20	53684	53686	53683	53670	53669	53668	53686	53677	53679	53677	53686	53677	53680	53688	53684
21	53699	53702	53696	53701	53665	53664	53666	53668	53677	53678	53691	53686	53679	53680	53679
22	53682	53681	53705	53672	53670	53680	53665	53677	53678	53678	53690	53678	53679	53681	53680
23	53684	53692	53682	53671	53670	53680	53661	53665	53681	53677	53683	53692	53679	53680	53679
25	53695	53695	53692	53703	53670	53681	53682	53667	53680	53679	53687	53680	53680	53681	53678
30	53697	53703	53688	53705	53669	53680	53665	53677	53678	53677	53684	53665	53678	53680	53678
40	53699	53703	53695	53702	53669	53680	53663	53670	53681	53677	53694	53688	53678	53685	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	53678 bytes	–	100%
1,000	53674 bytes	-4 bytes	100%
10,000	53663 bytes	-11 bytes	100%
100,000	53662 bytes	-1 byte	1.74%
1,000,000	53661 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)	53826 bytes	+165 bytes (+0.31%)	+76 bytes
1	53750 bytes	+89 bytes (+0.17%)	–
2	53775 bytes	+114 bytes (+0.21%)	+25 bytes
3	53798 bytes	+137 bytes (+0.26%)	+48 bytes
4	53826 bytes	+165 bytes (+0.31%)	+76 bytes
5	53858 bytes	+197 bytes (+0.37%)	+108 bytes
6	53892 bytes	+231 bytes (+0.43%)	+142 bytes
7	53902 bytes	+241 bytes (+0.45%)	+152 bytes
8	53899 bytes	+238 bytes (+0.44%)	+149 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 - but your browser doesn't support it.

Algorithm	Program	Parameters	Size	Compared To Best Zopfli
ZPAQ (Wikipedia)	zpaq	zpaq -method 69	39442 bytes	-14219 bytes (-26.50%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	47083 bytes	-6578 bytes (-12.26%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	48029 bytes	-5632 bytes (-10.50%)
Brotli (Wikipedia)	brotli	brotli -q 11	49538 bytes	-4123 bytes (-7.68%)
LZMA2 (Wikipedia)	xz	xz -9	50620 bytes	-3041 bytes (-5.67%)
Zstandard (Wikipedia)	zstd	zstd -19	51964 bytes	-1697 bytes (-3.16%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	52198 bytes	-1463 bytes (-2.73%)

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 2024.
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.