Dojo 1.9.4 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 621478 bytes (606.9k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 161310 bytes (157.5k, 26%).

After GZIP compression these minified files vary in size:

Boot	63997 bytes (62.5k)	CDN
cdnjs	55480 bytes (54.2k)	CDN
gzip -6 (default)	55220 bytes (53.9k)	local copy
gzip -9	55166 bytes (53.9k)	local copy
libdeflate -12	52578 bytes (51.3k)	local copy
7zip -mx=9 -tgzip	52560 bytes (51.3k)	local copy
pigz -11 -n	52508 bytes (51.3k)	local copy
kzip -s0 -rn -b1	52502 bytes (51.3k)	local copy
zultra	52473 bytes (51.2k)	local copy
Zopfli	52324 bytes (51.1k)	local copy
Zopfli (defluff)	52323 bytes (51.1k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.9.4.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.9.4 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

Save 3156 bytes by using my Dojo 1.9.4 Zopfli version instead of the best available CDN (6.03% smaller than cdnjs, 52324 vs. 55480 bytes):

Download

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 --mls2 --bsr13 --lazy --ohh

(found January 30, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	2	--mls2
block splitting recursion	13	--bsr13
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 (52323 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-1.9.4/dojo.js --location | md5sum
cc2610b04e984868222722dacfafbd7b -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.9.4.min.zopfli.js.gz | md5sum
cc2610b04e984868222722dacfafbd7b -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.9.4/dojo.js --location | sha1sum
9567a3856083ba0d323e52412165cb6fd6e9a18a -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.9.4.min.zopfli.js.gz | sha1sum
9567a3856083ba0d323e52412165cb6fd6e9a18a -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	63997 bytes	cc2610b04e984868222722dacfafbd7b	March 19, 2015 @ 15:43
cdnjs	55480 bytes	cc2610b04e984868222722dacfafbd7b	February 8, 2015 @ 14:45

Note: only the MD5 hashes are shown to keep things simple.

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
52324 bytes	-2 bytes	zopfli --i1000000 --mls2 --bsr13 --lazy --ohh	January 30, 2020 @ 20:59
52326 bytes	-8 bytes	zopfli --i100000 --mls2 --bsr13 --lazy --ohh	December 3, 2015 @ 23:06
52334 bytes	-5 bytes	zopfli --i10000 --mls8 --bsr30 --lazy --ohh	September 24, 2015 @ 14:04
52339 bytes	-6 bytes	zopfli --i1000 --mls8 --bsr30 --lazy --ohh	September 24, 2015 @ 13:11
52345 bytes	-5 bytes	zopfli --i1000 --mls2 --bsr12 --lazy --ohh	September 22, 2015 @ 17:56
52350 bytes	-2 bytes	zopfli --i1000 --mls8 --bsr9 --lazy --ohh	September 19, 2015 @ 02:33
52352 bytes	-10 bytes	zopfli --i1000 --mls8 --bsr8 --lazy --ohh	September 19, 2015 @ 02:09
52362 bytes	–	zopfli --i100 --mls8 --bsr9 --lazy --ohh	September 18, 2015 @ 15:56

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

Most recent activity on March 10, 2022 @ 22:50.

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	52408	52406	52404	52406	52407	52408	52406	52406	52405	52424	52402	52427	52423	52426	52407
4	52370	52357	52347	52399	52417	52409	52419	52412	52408	52406	52411	52424	52423	52411	52406
6	52359	52354	52358	52402	52400	52408	52402	52404	52406	52404	52416	52425	52418	52420	52413
7	52348	52348	52338	52399	52400	52405	52406	52419	52408	52406	52416	52423	52417	52414	52410
8	52345	52346	52346	52401	52401	52401	52405	52399	52404	52418	52414	52424	52414	52406	52412
9	52348	52348	52341	52399	52401	52402	52405	52401	52409	52415	52406	52423	52421	52415	52410
10	52367	52366	52359	52399	52403	52401	52401	52404	52407	52407	52414	52416	52423	52426	52411
11	52340	52345	52355	52401	52402	52401	52403	52405	52408	52404	52417	52424	52424	52424	52411
12	52325	52349	52357	52399	52401	52401	52401	52405	52407	52404	52416	52409	52423	52401	52418
13	52324	52341	52347	52399	52401	52401	52401	52399	52405	52403	52402	52423	52423	52412	52409
14	52346	52345	52422	52400	52403	52401	52400	52401	52407	52401	52416	52413	52424	52413	52410
15	52347	52341	52358	52409	52401	52401	52401	52412	52405	52400	52401	52423	52417	52405	52409
16	52354	52350	52349	52399	52401	52402	52406	52407	52406	52406	52406	52423	52420	52409	52409
17	52349	52349	52423	52403	52402	52403	52403	52401	52405	52415	52414	52422	52424	52403	52411
18	52329	52351	52350	52400	52402	52401	52401	52403	52403	52400	52407	52423	52422	52400	52410
19	52400	52400	52400	52400	52402	52401	52409	52399	52407	52400	52417	52423	52421	52405	52410
20	52346	52351	52357	52400	52403	52402	52401	52404	52408	52400	52416	52422	52423	52424	52410
21	52348	52351	52356	52400	52399	52401	52401	52401	52403	52415	52407	52423	52423	52405	52407
22	52355	52345	52357	52400	52402	52401	52406	52404	52406	52415	52401	52416	52425	52415	52414
23	52345	52341	52354	52400	52406	52402	52405	52401	52405	52416	52417	52422	52422	52415	52410
25	52352	52357	52350	52399	52402	52400	52405	52405	52407	52406	52412	52423	52422	52404	52410
30	52347	52350	52328	52399	52403	52401	52406	52403	52407	52417	52415	52422	52423	52405	52410
40	52348	52349	52353	52399	52402	52401	52400	52403	52408	52417	52415	52423	52422	52404	52412

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	52349 bytes	–	100%
1,000	52339 bytes	-10 bytes	100%
10,000	52334 bytes	-5 bytes	100%
100,000	52326 bytes	-8 bytes	2.61%
1,000,000	52324 bytes	-2 bytes	0.58%
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)	52568 bytes	+244 bytes (+0.47%)	+66 bytes
1	52502 bytes	+178 bytes (+0.34%)	–
2	52519 bytes	+195 bytes (+0.37%)	+17 bytes
3	52555 bytes	+231 bytes (+0.44%)	+53 bytes
4	52595 bytes	+271 bytes (+0.52%)	+93 bytes
5	52618 bytes	+294 bytes (+0.56%)	+116 bytes
6	52628 bytes	+304 bytes (+0.58%)	+126 bytes
7	52651 bytes	+327 bytes (+0.62%)	+149 bytes
8	52676 bytes	+352 bytes (+0.67%)	+174 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	38448 bytes	-13876 bytes (-26.52%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	45532 bytes	-6792 bytes (-12.98%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	46853 bytes	-5471 bytes (-10.46%)
Brotli (Wikipedia)	brotli	brotli -q 11	47973 bytes	-4351 bytes (-8.32%)
LZMA2 (Wikipedia)	xz	xz -9	49116 bytes	-3208 bytes (-6.13%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	50540 bytes	-1784 bytes (-3.41%)
Zstandard (Wikipedia)	zstd	zstd -19	50595 bytes	-1729 bytes (-3.30%)

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.