Dojo 1.15.0 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 639090 bytes (624.1k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167783 bytes (163.9k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	56370 bytes (55.0k)	local copy
gzip -9	56301 bytes (55.0k)	local copy
libdeflate -12	53627 bytes (52.4k)	local copy
7zip -mx=9 -tgzip	53603 bytes (52.3k)	local copy
zultra	53538 bytes (52.3k)	local copy
pigz -11 -n	53533 bytes (52.3k)	local copy
kzip -s0 -rn -b1	53526 bytes (52.3k)	local copy
Zopfli	53439 bytes (52.2k)	local copy
Zopfli (defluff)	53436 bytes (52.2k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.15.0.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.15.0 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 --mls256 --bsr19 --lazy --ohh

(found February 22, 2019)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	256	--mls256
block splitting recursion	19	--bsr19
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 (53436 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-1.15.0/dojo.js --location | md5sum
557e7937385d2c12babfb6cf9c5f92cd -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.15.0.min.zopfli.js.gz | md5sum
557e7937385d2c12babfb6cf9c5f92cd -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.15.0/dojo.js --location | sha1sum
9f41a44b4d4a0d8637b37954a82c164dbc7cf28c -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.15.0.min.zopfli.js.gz | sha1sum
9f41a44b4d4a0d8637b37954a82c164dbc7cf28c -

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
53439 bytes	-2 bytes	zopfli --i1000000 --mls256 --bsr19 --lazy --ohh	February 22, 2019 @ 20:01
53441 bytes	-1 byte	zopfli --i100000 --mls256 --bsr19 --lazy --ohh	February 21, 2019 @ 17:08
53442 bytes	-1 byte	zopfli --i100000 --mls256 --bsr2 --lazy --ohh	February 20, 2019 @ 10:34
53443 bytes	-3 bytes	zopfli --i10000 --mls256 --bsr2 --lazy --ohh	February 19, 2019 @ 19:56
53446 bytes	-3 bytes	zopfli --i10000 --mls8192 --bsr9 --lazy --ohh	February 19, 2019 @ 16:06
53449 bytes	-2 bytes	zopfli --i10000 --mls128 --bsr9 --lazy --ohh	February 19, 2019 @ 14:32
53451 bytes	-1 byte	zopfli --i10000 --mls64 --bsr9 --lazy --ohh	February 19, 2019 @ 13:25
53452 bytes	-2 bytes	zopfli --i10000 --mls4096 --bsr9 --lazy --ohh	February 19, 2019 @ 13:01
53454 bytes	-1 byte	zopfli --i1000 --mls8192 --bsr9 --lazy --ohh	February 19, 2019 @ 10:43
53455 bytes	-2 bytes	zopfli --i1000 --mls128 --bsr20 --lazy --ohh	February 19, 2019 @ 07:40
53457 bytes	-1 byte	zopfli --i1000 --mls32 --bsr2 --lazy --ohh	February 19, 2019 @ 07:34
53458 bytes	–	zopfli --i100 --mls8192 --bsr40 --lazy --ohh	February 18, 2019 @ 20:24

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 @ 15:34.

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	53480	53448	53449	53449	53449	53450	53449	53442	53470	53469	53467	53453	53453	53485	53462
4	53498	53483	53453	53449	53452	53457	53449	53448	53458	53451	53467	53454	53452	53468	53454
6	53480	53494	53447	53447	53453	53462	53446	53459	53457	53457	53464	53469	53454	53466	53466
7	53474	53448	53487	53449	53451	53455	53448	53448	53457	53454	53456	53454	53455	53467	53456
8	53481	53478	53484	53487	53447	53456	53447	53447	53467	53457	53471	53448	53449	53466	53463
9	53455	53474	53447	53448	53447	53451	53449	53439	53457	53457	53474	53452	53446	53471	53457
10	53493	53447	53450	53489	53449	53447	53458	53447	53458	53459	53461	53454	53448	53465	53465
11	53491	53446	53450	53447	53450	53446	53448	53447	53457	53457	53460	53450	53455	53468	53459
12	53480	53483	53478	53454	53448	53447	53447	53448	53457	53457	53464	53455	53455	53457	53456
13	53476	53478	53450	53449	53449	53455	53446	53447	53457	53457	53460	53449	53448	53466	53463
14	53484	53489	53490	53483	53451	53450	53453	53448	53458	53459	53460	53453	53454	53465	53454
15	53475	53483	53446	53449	53447	53461	53442	53447	53458	53457	53464	53455	53449	53466	53460
16	53478	53482	53479	53488	53448	53462	53446	53459	53455	53459	53460	53462	53456	53467	53460
17	53475	53487	53490	53495	53447	53458	53446	53458	53458	53457	53459	53448	53455	53457	53457
18	53475	53447	53450	53486	53448	53447	53446	53458	53457	53457	53463	53451	53456	53462	53462
19	53475	53448	53450	53451	53455	53456	53446	53439	53457	53458	53463	53452	53451	53470	53458
20	53481	53484	53450	53449	53452	53462	53446	53457	53457	53457	53473	53454	53447	53466	53458
21	53481	53486	53450	53448	53452	53450	53458	53448	53457	53457	53464	53461	53447	53466	53455
22	53471	53487	53450	53486	53447	53468	53446	53447	53457	53456	53460	53450	53448	53454	53457
23	53448	53453	53447	53448	53448	53455	53446	53458	53457	53457	53466	53452	53450	53464	53461
25	53477	53480	53450	53447	53451	53462	53446	53458	53463	53460	53460	53449	53446	53468	53462
30	53481	53482	53447	53448	53451	53461	53448	53458	53457	53457	53463	53450	53454	53466	53455
40	53479	53483	53455	53449	53452	53458	53440	53458	53457	53457	53459	53470	53450	53467	53458

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	53458 bytes	–	100%
1,000	53454 bytes	-4 bytes	100%
10,000	53443 bytes	-11 bytes	100%
100,000	53441 bytes	-2 bytes	1.45%
1,000,000	53439 bytes	-2 bytes	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)	53607 bytes	+168 bytes (+0.31%)	+81 bytes
1	53526 bytes	+87 bytes (+0.16%)	–
2	53560 bytes	+121 bytes (+0.23%)	+34 bytes
3	53587 bytes	+148 bytes (+0.28%)	+61 bytes
4	53607 bytes	+168 bytes (+0.31%)	+81 bytes
5	53606 bytes	+167 bytes (+0.31%)	+80 bytes
6	53606 bytes	+167 bytes (+0.31%)	+80 bytes
7	53656 bytes	+217 bytes (+0.41%)	+130 bytes
8	53680 bytes	+241 bytes (+0.45%)	+154 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	39285 bytes	-14154 bytes (-26.49%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46911 bytes	-6528 bytes (-12.22%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47837 bytes	-5602 bytes (-10.48%)
Brotli (Wikipedia)	brotli	brotli -q 11	49360 bytes	-4079 bytes (-7.63%)
LZMA2 (Wikipedia)	xz	xz -9	50436 bytes	-3003 bytes (-5.62%)
Zstandard (Wikipedia)	zstd	zstd -19	51764 bytes	-1675 bytes (-3.13%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	52089 bytes	-1350 bytes (-2.53%)

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.