Dojo 1.15.6 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 639407 bytes (624.4k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167969 bytes (164.0k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	56446 bytes (55.1k)	local copy
gzip -9	56377 bytes (55.1k)	local copy
libdeflate -12	53683 bytes (52.4k)	local copy
7zip -mx=9 -tgzip	53672 bytes (52.4k)	local copy
kzip -s0 -rn -b1	53603 bytes (52.3k)	local copy
zultra	53594 bytes (52.3k)	local copy
pigz -11 -n	53580 bytes (52.3k)	local copy
Zopfli	53507 bytes (52.3k)	local copy
Zopfli (defluff)	53504 bytes (52.3k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.15.6.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.15.6 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 --mls256 --bsr2 --lazy --ohh

(found March 3, 2022)

Description	Value	Parameter
iterations	100000	--i100000
maximum blocks	8	--mb8
maximum length score	256	--mls256
block splitting recursion	2	--bsr2
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 (53504 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-1.15.6/dojo.js --location | md5sum
b0b73b07ba7eb2d823fd6d2ad23231b5 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.15.6.min.zopfli.js.gz | md5sum
b0b73b07ba7eb2d823fd6d2ad23231b5 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.15.6/dojo.js --location | sha1sum
1b5f6bd5439e0ab40e8f7e962c30bb029426bacc -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.15.6.min.zopfli.js.gz | sha1sum
1b5f6bd5439e0ab40e8f7e962c30bb029426bacc -

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
53507 bytes	-1 byte	zopfli --i100000 --mls256 --bsr2 --lazy --ohh	March 3, 2022 @ 10:47
53508 bytes	-1 byte	zopfli --i10000 --mls256 --bsr2 --lazy --ohh	February 25, 2022 @ 16:47
53509 bytes	-1 byte	zopfli --i10000 --mls128 --bsr4 --lazy --ohh	February 25, 2022 @ 11:18
53510 bytes	-8 bytes	zopfli --i10000 --mls32 --bsr12 --lazy --ohh	February 25, 2022 @ 10:00
53518 bytes	-1 byte	zopfli --i1000 --mls32 --bsr15 --lazy --ohh	February 24, 2022 @ 19:57
53519 bytes	-1 byte	zopfli --i1000 --mls32 --bsr40 --lazy --ohh	February 24, 2022 @ 18:41
53520 bytes	-1 byte	zopfli --i1000 --mls128 --bsr16 --lazy --ohh	February 24, 2022 @ 17:46
53521 bytes	-1 byte	zopfli --i1000 --mls256 --bsr21 --lazy --ohh	February 24, 2022 @ 17:40
53522 bytes	–	zopfli --i100 --mls32 --bsr40 --lazy --ohh	February 24, 2022 @ 15:16

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

Most recent activity on March 3, 2022 @ 21:35.

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	53546	53513	53513	53514	53517	53512	53509	53507	53528	53528	53528	53516	53517	53544	53532
4	53542	53543	53517	53517	53520	53525	53509	53513	53520	53516	53515	53523	53516	53534	53518
6	53544	53543	53517	53515	53519	53523	53511	53521	53519	53520	53525	53514	53523	53512	53532
7	53529	53552	53514	53554	53517	53524	53521	53519	53519	53519	53518	53515	53519	53510	53523
8	53542	53542	53516	53558	53515	53527	53510	53513	53527	53527	53525	53514	53514	53527	53524
9	53543	53550	53519	53517	53524	53514	53511	53520	53522	53519	53529	53515	53511	53528	53527
10	53513	53514	53543	53555	53511	53514	53524	53512	53525	53520	53519	53518	53511	53528	53530
11	53529	53529	53518	53515	53511	53508	53513	53511	53522	53518	53527	53518	53525	53521	53518
12	53542	53543	53516	53557	53510	53510	53513	53513	53522	53519	53525	53513	53511	53520	53527
13	53541	53539	53514	53515	53514	53521	53511	53514	53522	53518	53524	53524	53514	53522	53528
14	53530	53529	53543	53554	53513	53515	53519	53513	53518	53523	53523	53519	53524	53521	53529
15	53530	53513	53514	53541	53511	53528	53520	53512	53519	53519	53528	53516	53513	53532	53529
16	53541	53541	53538	53549	53511	53528	53511	53520	53522	53513	53522	53525	53524	53524	53532
17	53545	53540	53541	53555	53517	53524	53511	53521	53523	53519	53522	53514	53523	53521	53530
18	53513	53516	53517	53545	53514	53514	53511	53520	53519	53521	53527	53516	53512	53520	53535
19	53530	53513	53513	53513	53517	53528	53511	53511	53521	53519	53525	53515	53512	53525	53522
20	53531	53513	53516	53515	53514	53525	53511	53521	53522	53519	53528	53519	53524	53532	53515
21	53537	53543	53542	53546	53510	53513	53512	53515	53522	53519	53525	53525	53512	53525	53530
22	53526	53546	53515	53542	53515	53527	53511	53513	53519	53520	53522	53524	53513	53518	53529
23	53529	53538	53511	53539	53512	53529	53510	53520	53519	53519	53523	53513	53515	53524	53526
25	53543	53543	53544	53546	53513	53519	53511	53519	53520	53523	53522	53519	53513	53526	53528
30	53540	53542	53513	53514	53511	53526	53511	53519	53522	53518	53523	53517	53537	53531	53530
40	53540	53538	53513	53540	53513	53526	53510	53520	53522	53518	53523	53517	53521	53516	53531

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	53522 bytes	–	100%
1,000	53518 bytes	-4 bytes	100%
10,000	53508 bytes	-10 bytes	100%
100,000	53507 bytes	-1 byte	1.16%
1,000,000	53507 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)	53671 bytes	+164 bytes (+0.31%)	+68 bytes
1	53603 bytes	+96 bytes (+0.18%)	–
2	53629 bytes	+122 bytes (+0.23%)	+26 bytes
3	53653 bytes	+146 bytes (+0.27%)	+50 bytes
4	53678 bytes	+171 bytes (+0.32%)	+75 bytes
5	53716 bytes	+209 bytes (+0.39%)	+113 bytes
6	53742 bytes	+235 bytes (+0.44%)	+139 bytes
7	53760 bytes	+253 bytes (+0.47%)	+157 bytes
8	53741 bytes	+234 bytes (+0.44%)	+138 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	39330 bytes	-14177 bytes (-26.50%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46940 bytes	-6567 bytes (-12.27%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47853 bytes	-5654 bytes (-10.57%)
Brotli (Wikipedia)	brotli	brotli -q 11	49377 bytes	-4130 bytes (-7.72%)
LZMA2 (Wikipedia)	xz	xz -9	50460 bytes	-3047 bytes (-5.69%)
Zstandard (Wikipedia)	zstd	zstd -19	51821 bytes	-1686 bytes (-3.15%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	52134 bytes	-1373 bytes (-2.57%)

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.