Dojo 1.15.4 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 639282 bytes (624.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167922 bytes (164.0k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	56425 bytes (55.1k)	local copy
gzip -9	56356 bytes (55.0k)	local copy
libdeflate -12	53660 bytes (52.4k)	local copy
7zip -mx=9 -tgzip	53649 bytes (52.4k)	local copy
kzip -s0 -rn -b1	53575 bytes (52.3k)	local copy
zultra	53573 bytes (52.3k)	local copy
pigz -11 -n	53562 bytes (52.3k)	local copy
Zopfli	53481 bytes (52.2k)	local copy
Zopfli (defluff)	53479 bytes (52.2k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.15.4.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.15.4 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 --bsr18 --lazy --ohh

(found June 18, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	128	--mls128
block splitting recursion	18	--bsr18
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 (53479 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-1.15.4/dojo.js --location | md5sum
72133feb44e10fd2764d2b8d7cd5f92e -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.15.4.min.zopfli.js.gz | md5sum
72133feb44e10fd2764d2b8d7cd5f92e -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.15.4/dojo.js --location | sha1sum
9ec0f1e859550f8c356cb202cad1b0bac4bdc961 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.15.4.min.zopfli.js.gz | sha1sum
9ec0f1e859550f8c356cb202cad1b0bac4bdc961 -

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
53481 bytes	-3 bytes	zopfli --i1000000 --mls128 --bsr18 --lazy --ohh	June 18, 2020 @ 21:54
53484 bytes	-3 bytes	zopfli --i100000 --mls128 --bsr40 --lazy --ohh	June 17, 2020 @ 10:44
53487 bytes	-1 byte	zopfli --i10000 --mls256 --bsr2 --lazy --ohh	June 16, 2020 @ 01:53
53488 bytes	-2 bytes	zopfli --i10000 --mls128 --bsr18 --lazy --ohh	June 15, 2020 @ 15:48
53490 bytes	-4 bytes	zopfli --i10000 --mls256 --bsr17 --lazy --ohh	June 15, 2020 @ 15:02
53494 bytes	-1 byte	zopfli --i10000 --mls32 --bsr2 --lazy --ohh	June 15, 2020 @ 14:54
53495 bytes	-1 byte	zopfli --i1000 --mls32 --bsr12 --lazy --ohh	June 15, 2020 @ 12:30
53496 bytes	-1 byte	zopfli --i1000 --mls8 --bsr23 --lazy --ohh	June 15, 2020 @ 12:07
53497 bytes	-1 byte	zopfli --i1000 --mls8192 --bsr9 --lazy --ohh	June 15, 2020 @ 12:04
53498 bytes	-1 byte	zopfli --i1000 --mls32 --bsr23 --lazy --ohh	June 15, 2020 @ 12:00
53499 bytes	–	zopfli --i100 --mls32 --bsr14 --lazy --ohh	June 15, 2020 @ 11:38

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

Most recent activity on February 24, 2022 @ 16:41.

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	53529	53491	53492	53492	53494	53495	53487	53486	53503	53506	53506	53495	53494	53522	53509
4	53527	53521	53496	53494	53499	53503	53489	53490	53498	53492	53493	53498	53495	53509	53495
6	53519	53521	53496	53492	53501	53497	53489	53499	53499	53507	53505	53495	53502	53506	53501
7	53501	53531	53492	53491	53495	53501	53502	53492	53498	53492	53506	53494	53501	53493	53504
8	53524	53519	53495	53530	53494	53498	53481	53493	53504	53503	53509	53493	53494	53505	53503
9	53520	53517	53498	53492	53499	53494	53490	53491	53498	53497	53507	53497	53491	53507	53509
10	53492	53492	53525	53526	53489	53491	53502	53490	53497	53499	53500	53496	53491	53508	53509
11	53507	53506	53496	53523	53490	53489	53491	53489	53498	53498	53506	53494	53505	53500	53497
12	53524	53521	53496	53531	53489	53490	53492	53493	53499	53499	53503	53495	53503	53499	53503
13	53519	53521	53493	53492	53493	53497	53486	53491	53499	53498	53503	53498	53491	53504	53498
14	53508	53522	53532	53526	53492	53494	53497	53492	53499	53503	53501	53495	53500	53501	53506
15	53520	53505	53493	53492	53490	53504	53502	53491	53496	53506	53506	53494	53499	53499	53506
16	53518	53521	53517	53529	53490	53507	53489	53498	53498	53499	53500	53503	53504	53500	53505
17	53518	53517	53523	53533	53495	53500	53486	53490	53497	53498	53504	53492	53503	53500	53508
18	53505	53495	53489	53518	53492	53493	53481	53498	53497	53497	53507	53492	53499	53503	53510
19	53508	53492	53491	53492	53495	53499	53486	53490	53498	53499	53504	53493	53504	53500	53507
20	53510	53492	53493	53493	53493	53502	53486	53499	53501	53499	53506	53492	53493	53511	53493
21	53515	53523	53520	53525	53489	53493	53501	53492	53499	53499	53505	53492	53491	53505	53510
22	53508	53525	53520	53492	53494	53506	53486	53490	53499	53500	53501	53495	53492	53495	53506
23	53509	53520	53490	53490	53493	53506	53486	53498	53497	53506	53506	53492	53493	53503	53507
25	53519	53522	53521	53523	53492	53498	53486	53497	53500	53502	53501	53502	53492	53500	53507
30	53519	53521	53492	53493	53495	53500	53490	53498	53498	53498	53502	53492	53506	53510	53509
40	53517	53514	53516	53492	53492	53507	53481	53499	53499	53498	53500	53496	53506	53495	53511

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	53499 bytes	–	100%
1,000	53495 bytes	-4 bytes	100%
10,000	53487 bytes	-8 bytes	100%
100,000	53484 bytes	-3 bytes	3.48%
1,000,000	53481 bytes	-3 bytes	1.16%
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)	53642 bytes	+161 bytes (+0.30%)	+67 bytes
1	53575 bytes	+94 bytes (+0.18%)	–
2	53601 bytes	+120 bytes (+0.22%)	+26 bytes
3	53630 bytes	+149 bytes (+0.28%)	+55 bytes
4	53642 bytes	+161 bytes (+0.30%)	+67 bytes
5	53682 bytes	+201 bytes (+0.38%)	+107 bytes
6	53711 bytes	+230 bytes (+0.43%)	+136 bytes
7	53732 bytes	+251 bytes (+0.47%)	+157 bytes
8	53724 bytes	+243 bytes (+0.45%)	+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	39318 bytes	-14163 bytes (-26.48%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46927 bytes	-6554 bytes (-12.25%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47846 bytes	-5635 bytes (-10.54%)
Brotli (Wikipedia)	brotli	brotli -q 11	49371 bytes	-4110 bytes (-7.68%)
LZMA2 (Wikipedia)	xz	xz -9	50448 bytes	-3033 bytes (-5.67%)
Zstandard (Wikipedia)	zstd	zstd -19	51805 bytes	-1676 bytes (-3.13%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	52109 bytes	-1372 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.