Dojo 1.9.3 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 619502 bytes (605.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 160737 bytes (157.0k, 26%).

After GZIP compression these minified files vary in size:

Boot	63796 bytes (62.3k)	CDN
cdnjs	55316 bytes (54.0k)	CDN
gzip -6 (default)	55066 bytes (53.8k)	local copy
gzip -9	55009 bytes (53.7k)	local copy
7zip -mx=9 -tgzip	52430 bytes (51.2k)	local copy
libdeflate -12	52419 bytes (51.2k)	local copy
zultra	52383 bytes (51.2k)	local copy
pigz -11 -n	52380 bytes (51.2k)	local copy
kzip -s0 -rn -b1	52379 bytes (51.2k)	local copy
Zopfli	52217 bytes (51.0k)	local copy
Zopfli (defluff)	52214 bytes (51.0k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.9.3.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.9.3 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

Save 3099 bytes by using my Dojo 1.9.3 Zopfli version instead of the best available CDN (5.93% smaller than cdnjs, 52217 vs. 55316 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 --bsr7 --lazy --ohh

(found January 30, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	2	--mls2
block splitting recursion	7	--bsr7
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 (52214 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-1.9.3/dojo.js --location | md5sum
74969b3e4d512389462576e87cd89f5e -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.9.3.min.zopfli.js.gz | md5sum
74969b3e4d512389462576e87cd89f5e -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.9.3/dojo.js --location | sha1sum
2462ca7c70647853b69cd5808a6a32e476ae9567 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.9.3.min.zopfli.js.gz | sha1sum
2462ca7c70647853b69cd5808a6a32e476ae9567 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	63796 bytes	74969b3e4d512389462576e87cd89f5e	March 19, 2015 @ 15:43
cdnjs	55316 bytes	74969b3e4d512389462576e87cd89f5e	June 6, 2014 @ 17:15

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
52217 bytes	-1 byte	zopfli --i1000000 --mls2 --bsr7 --lazy --ohh	January 30, 2020 @ 21:04
52218 bytes	-4 bytes	zopfli --i100000 --mls2 --bsr7 --lazy --ohh	December 3, 2015 @ 18:14
52222 bytes	-1 byte	zopfli --i10000 --mls2 --bsr7 --lazy --ohh	November 23, 2015 @ 00:11
52223 bytes	-6 bytes	zopfli --i10000 --mls2 --bsr11 --lazy --ohh	October 13, 2015 @ 20:22
52229 bytes	-1 byte	zopfli --i1000 --mls2 --bsr11 --lazy --ohh	September 22, 2015 @ 18:43
52230 bytes	-2 bytes	zopfli --i1000 --mls2 --bsr15 --lazy --ohh	September 22, 2015 @ 18:31
52232 bytes	-8 bytes	zopfli --i1000 --mls8 --bsr11 --lazy --ohh	September 19, 2015 @ 03:29
52240 bytes	–	zopfli --i100 --mls8 --bsr11 --lazy --ohh	September 18, 2015 @ 15:29

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

Most recent activity on July 20, 2020 @ 12:51.

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	52289	52281	52284	52287	52289	52286	52285	52287	52308	52308	52283	52303	52306	52302	52298
4	52238	52233	52292	52296	52290	52281	52292	52294	52290	52286	52294	52307	52296	52292	52297
6	52235	52234	52242	52296	52281	52281	52286	52287	52288	52288	52295	52300	52297	52300	52295
7	52217	52232	52293	52298	52289	52282	52285	52286	52285	52289	52295	52306	52299	52299	52288
8	52230	52232	52298	52297	52283	52281	52286	52284	52282	52308	52293	52288	52296	52281	52303
9	52234	52234	52232	52282	52278	52282	52286	52284	52290	52293	52294	52299	52298	52293	52303
10	52282	52235	52300	52285	52285	52284	52285	52286	52290	52285	52293	52301	52297	52299	52301
11	52219	52242	52225	52289	52285	52282	52285	52282	52277	52295	52292	52297	52297	52291	52297
12	52220	52238	52232	52284	52283	52282	52286	52292	52283	52287	52291	52289	52299	52286	52290
13	52283	52232	52297	52289	52284	52282	52289	52283	52290	52288	52295	52296	52297	52289	52303
14	52229	52231	52231	52302	52282	52284	52287	52282	52281	52283	52292	52287	52297	52291	52306
15	52219	52226	52232	52297	52282	52282	52286	52283	52285	52290	52293	52307	52299	52291	52289
16	52235	52231	52297	52284	52284	52283	52286	52284	52287	52284	52285	52299	52296	52292	52301
17	52279	52232	52232	52299	52284	52283	52284	52284	52287	52302	52293	52307	52297	52286	52302
18	52231	52233	52300	52289	52285	52286	52288	52283	52286	52291	52291	52300	52299	52284	52296
19	52225	52230	52239	52291	52284	52282	52286	52283	52279	52282	52294	52297	52297	52292	52302
20	52224	52229	52230	52285	52280	52282	52286	52286	52287	52282	52292	52300	52299	52290	52296
21	52221	52227	52231	52283	52281	52283	52285	52282	52278	52300	52292	52299	52300	52304	52297
22	52226	52231	52235	52302	52283	52282	52284	52282	52289	52299	52299	52300	52303	52300	52295
23	52227	52234	52235	52285	52284	52281	52287	52283	52290	52286	52293	52299	52294	52296	52300
25	52226	52232	52298	52289	52283	52284	52285	52286	52289	52287	52292	52299	52297	52282	52298
30	52225	52229	52229	52286	52283	52282	52287	52283	52290	52300	52288	52299	52294	52294	52295
40	52236	52225	52231	52291	52281	52282	52286	52283	52281	52286	52294	52307	52296	52287	52297

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	52237 bytes	–	100%
1,000	52229 bytes	-8 bytes	100%
10,000	52222 bytes	-7 bytes	100%
100,000	52218 bytes	-4 bytes	1.45%
1,000,000	52217 bytes	-1 byte	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)	52435 bytes	+218 bytes (+0.42%)	+56 bytes
1	52379 bytes	+162 bytes (+0.31%)	–
2	52395 bytes	+178 bytes (+0.34%)	+16 bytes
3	52434 bytes	+217 bytes (+0.42%)	+55 bytes
4	52468 bytes	+251 bytes (+0.48%)	+89 bytes
5	52487 bytes	+270 bytes (+0.52%)	+108 bytes
6	52498 bytes	+281 bytes (+0.54%)	+119 bytes
7	52525 bytes	+308 bytes (+0.59%)	+146 bytes
8	52533 bytes	+316 bytes (+0.61%)	+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	38278 bytes	-13939 bytes (-26.69%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	45412 bytes	-6805 bytes (-13.03%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	46746 bytes	-5471 bytes (-10.48%)
Brotli (Wikipedia)	brotli	brotli -q 11	47838 bytes	-4379 bytes (-8.39%)
LZMA2 (Wikipedia)	xz	xz -9	49024 bytes	-3193 bytes (-6.11%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	50341 bytes	-1876 bytes (-3.59%)
Zstandard (Wikipedia)	zstd	zstd -19	50476 bytes	-1741 bytes (-3.33%)

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.