Dojo 1.7.6 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 563729 bytes (550.5k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 140388 bytes (137.1k, 25%).

After GZIP compression these minified files vary in size:

Boot	56001 bytes (54.7k)	CDN
cdnjs	48727 bytes (47.6k)	CDN
gzip -6 (default)	48548 bytes (47.4k)	local copy
gzip -9	48500 bytes (47.4k)	local copy
7zip -mx=9 -tgzip	46310 bytes (45.2k)	local copy
libdeflate -12	46252 bytes (45.2k)	local copy
zultra	46239 bytes (45.2k)	local copy
kzip -s0 -rn -b1	46226 bytes (45.1k)	local copy
pigz -11 -n	46218 bytes (45.1k)	local copy
Zopfli	46133 bytes (45.1k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.7.6.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.7.6 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

Save 2594 bytes by using my Dojo 1.7.6 Zopfli version instead of the best available CDN (5.62% smaller than cdnjs, 46133 vs. 48727 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 --mls16384 --bsr40 --lazy --ohh

(found March 16, 2022)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	16384	--mls16384
block splitting recursion	40	--bsr40
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

Verify file integrity

After decompression, my uncompressed files are identical to the original ones:

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.7.6/dojo.js --location | md5sum
78e68915d00425b1157af615009f5ef4 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.6.min.zopfli.js.gz | md5sum
78e68915d00425b1157af615009f5ef4 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.7.6/dojo.js --location | sha1sum
5a100335c9348b5c1d26b8cea44d62f7248be7d7 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.6.min.zopfli.js.gz | sha1sum
5a100335c9348b5c1d26b8cea44d62f7248be7d7 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	56001 bytes	78e68915d00425b1157af615009f5ef4	March 19, 2015 @ 15:35
cdnjs	48727 bytes	78e68915d00425b1157af615009f5ef4	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
46133 bytes	-2 bytes	zopfli --i1000000 --mls16384 --bsr40 --lazy --ohh	March 16, 2022 @ 12:49
46135 bytes	-2 bytes	zopfli --i100000 --mls16384 --bsr9 --lazy --ohh	December 2, 2015 @ 17:38
46137 bytes	-4 bytes	zopfli --i10000 --mls16384 --bsr9 --lazy --ohh	October 14, 2015 @ 11:13
46141 bytes	-1 byte	zopfli --i1000 --mls16384 --bsr12 --lazy --ohh	September 12, 2015 @ 20:09
46142 bytes	-1 byte	zopfli --i1000 --mls16384 --bsr9 --lazy --ohh	September 12, 2015 @ 20:07
46143 bytes	-2 bytes	zopfli --i1000 --mls512 --bsr16 --lazy --ohh	September 10, 2015 @ 21:50
46145 bytes	-3 bytes	zopfli --i1000 --mls512 --bsr10 --lazy --ohh	September 10, 2015 @ 21:39
46148 bytes	-3 bytes	zopfli --i1000 --mls512 --bsr11 --lazy --ohh	September 10, 2015 @ 21:35
46151 bytes	-1 byte	zopfli --i1000 --mls512 --bsr2 --lazy --ohh	September 10, 2015 @ 21:35
46152 bytes	–	zopfli --i100 --mls512 --bsr11 --lazy --ohh	September 10, 2015 @ 15:03

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

Most recent activity on March 17, 2022 @ 01:59.

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	46155	46155	46154	46157	46151	46150	46150	46149	46148	46178	46143	46171	46171	46176	46157
4	46147	46138	46144	46146	46147	46145	46154	46150	46149	46167	46164	46161	46164	46161	46153
6	46150	46143	46146	46151	46148	46149	46148	46151	46146	46164	46160	46157	46164	46160	46164
7	46144	46143	46145	46143	46141	46151	46145	46143	46150	46155	46163	46162	46154	46154	46157
8	46147	46146	46146	46149	46147	46150	46158	46146	46147	46151	46164	46166	46168	46134	46148
9	46145	46143	46140	46140	46141	46147	46153	46147	46151	46153	46157	46161	46194	46135	46173
10	46144	46140	46141	46143	46136	46156	46159	46142	46144	46160	46159	46158	46161	46136	46154
11	46144	46144	46148	46147	46142	46149	46147	46146	46146	46151	46159	46159	46170	46157	46165
12	46148	46141	46142	46142	46143	46143	46147	46139	46159	46152	46157	46166	46155	46133	46157
13	46145	46148	46146	46145	46140	46145	46145	46146	46138	46164	46155	46155	46164	46139	46149
14	46144	46144	46144	46149	46141	46153	46150	46156	46155	46154	46152	46156	46167	46144	46149
15	46147	46144	46140	46146	46145	46149	46144	46148	46146	46150	46164	46164	46154	46154	46152
16	46144	46143	46145	46143	46141	46150	46151	46147	46143	46153	46159	46153	46170	46149	46152
17	46144	46144	46143	46144	46140	46147	46157	46146	46159	46157	46164	46169	46155	46139	46174
18	46145	46148	46140	46141	46137	46143	46154	46143	46149	46152	46157	46150	46159	46161	46165
19	46147	46147	46145	46146	46141	46142	46146	46142	46151	46152	46153	46157	46172	46145	46149
20	46145	46144	46144	46146	46141	46147	46146	46146	46141	46151	46159	46162	46170	46145	46143
21	46144	46140	46146	46143	46145	46143	46145	46142	46151	46153	46153	46154	46149	46152	46145
22	46145	46142	46144	46145	46139	46138	46155	46148	46142	46159	46160	46154	46171	46136	46156
23	46144	46147	46145	46146	46147	46150	46150	46146	46155	46150	46152	46154	46170	46136	46143
25	46144	46145	46147	46146	46142	46150	46152	46145	46149	46153	46161	46161	46161	46145	46147
30	46145	46142	46144	46145	46141	46142	46153	46147	46147	46159	46160	46167	46136	46152	46150
40	46144	46148	46144	46144	46141	46147	46156	46145	46147	46160	46156	46166	46171	46133	46155

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	46148 bytes	–	100%
1,000	46141 bytes	-7 bytes	100%
10,000	46137 bytes	-4 bytes	100%
100,000	46135 bytes	-2 bytes	2.90%
1,000,000	46133 bytes	-2 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)	46258 bytes	+125 bytes (+0.27%)	+32 bytes
1	46226 bytes	+93 bytes (+0.20%)	–
2	46258 bytes	+125 bytes (+0.27%)	+32 bytes
3	46293 bytes	+160 bytes (+0.35%)	+67 bytes
4	46316 bytes	+183 bytes (+0.40%)	+90 bytes
5	46307 bytes	+174 bytes (+0.38%)	+81 bytes
6	46338 bytes	+205 bytes (+0.44%)	+112 bytes
7	46371 bytes	+238 bytes (+0.52%)	+145 bytes
8	46387 bytes	+254 bytes (+0.55%)	+161 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	34428 bytes	-11705 bytes (-25.37%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	40393 bytes	-5740 bytes (-12.44%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	41255 bytes	-4878 bytes (-10.57%)
Brotli (Wikipedia)	brotli	brotli -q 11	42365 bytes	-3768 bytes (-8.17%)
LZMA2 (Wikipedia)	xz	xz -9	43460 bytes	-2673 bytes (-5.79%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	44724 bytes	-1409 bytes (-3.05%)
Zstandard (Wikipedia)	zstd	zstd -19	44758 bytes	-1375 bytes (-2.98%)

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.