Choose a version:
25% 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
cdnhttps
  48847 bytes (47.7k)
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
kzip -s0 -rn -b1
  46226 bytes (45.1k)
local copy
pigz -11 -n
  46218 bytes (45.1k)
local copy
Zopfli
  46135 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

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 2592 bytes by using my Dojo 1.7.6 Zopfli version instead of the best available CDN (5.62% smaller than cdnjs, 46135 vs. 48727 bytes):
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 --i100000 --mb8 --mls16384 --bsr9 --lazy --ohh

(found December 2, 2015)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 16384  --mls16384
block splitting recursion 9  --bsr9
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 http://download.dojotoolkit.org/release-1.7.6/dojo.js --location | md5sum
78e68915d00425b1157af615009f5ef4  -
curl --silent --compressed http://minime.stephan-brumme.com/files/dojo/dojo-1.7.6.min.zopfli.js.gz | md5sum
78e68915d00425b1157af615009f5ef4  -

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

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 56001 bytes 78e68915d00425b1157af615009f5ef4 March 19, 2015 @ 15:35
cdnjs 48727 bytes 78e68915d00425b1157af615009f5ef4 February 8, 2015 @ 14:45

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
cdnhttps 48847 bytes cb8dc63a02ad903a577dc07b5f0be13a < /*
< Copyright (c) 2004-2011, The Dojo Foundation All Rights R [...]
< Available via Academic Free License >= 2.1 OR the modifie [...]
< see: http://dojotoolkit.org/license for details
< */
<
< /*
< This is an optimized version of Dojo, built for deploymen [...]
< development. To get sources and documentation, please vis [...]
<
[...]
December 24, 2015 @ 07:33

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

Other Versions

Available Dojo versions at minime.stephan-brumme.com:

1.13.0,
1.12.3, 1.12.2, 1.12.1,
1.11.5, 1.11.4, 1.11.3, 1.11.2, 1.11.1, 1.11.0,
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,
1.8.12, 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,
1.7.10, 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,
1.6.3, 1.6.2, 1.6.1, 1.6.0,
1.5.4, 1.5.3, 1.5.2, 1.5.1, 1.5.0,
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

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
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 June 16, 2016 @ 14:39.

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 or 100,000.
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
46155 46155 46154 46157 46151 46150 46150 46149 46148 46178 46143 46171 46171 46176 46157
46147 46138 46144 46146 46147 46145 46154 46150 46149 46167 46164 46161 46164 46161 46153
46150 46143 46146 46151 46148 46149 46148 46151 46146 46164 46160 46157 46164 46160 46164
46144 46143 46145 46143 46141 46151 46145 46143 46150 46155 46163 46162 46154 46154 46157
46147 46146 46146 46149 46147 46150 46158 46146 46147 46151 46164 46166 46168 46135 46148
46145 46143 46140 46140 46141 46147 46153 46147 46151 46153 46157 46161 46194 46135 46173
46144 46140 46141 46143 46136 46156 46159 46142 46144 46160 46159 46158 46161 46136 46154
46144 46144 46148 46147 46142 46149 46147 46146 46146 46151 46159 46159 46170 46157 46165
46148 46141 46142 46142 46143 46143 46147 46139 46159 46152 46157 46166 46155 46135 46157
46145 46148 46146 46145 46140 46145 46145 46146 46138 46164 46155 46155 46164 46139 46149
46144 46144 46144 46149 46141 46153 46150 46156 46155 46154 46152 46156 46167 46144 46149
46147 46144 46140 46146 46145 46149 46144 46148 46146 46150 46164 46164 46154 46154 46152
46144 46143 46145 46143 46141 46150 46151 46147 46143 46153 46159 46153 46170 46149 46152
46144 46144 46143 46144 46140 46147 46157 46146 46159 46157 46164 46169 46155 46139 46174
46145 46148 46140 46141 46137 46143 46154 46143 46149 46152 46157 46150 46159 46161 46165
46147 46147 46145 46146 46141 46142 46146 46142 46151 46152 46153 46157 46172 46145 46149
46145 46144 46144 46146 46141 46147 46146 46146 46141 46151 46159 46162 46170 46145 46143
46144 46140 46146 46143 46145 46143 46145 46142 46151 46153 46153 46154 46149 46152 46145
46145 46142 46144 46145 46139 46138 46155 46148 46142 46159 46160 46154 46171 46136 46156
46144 46147 46145 46146 46147 46150 46150 46146 46155 46150 46152 46154 46170 46136 46143
46144 46145 46147 46146 46142 46150 46152 46145 46149 46153 46161 46161 46161 46145 46147
46145 46142 46144 46145 46141 46142 46153 46147 46147 46159 46160 46167 46136 46152 46150
46144 46148 46144 46144 46141 46147 46156 46145 46147 46160 46156 46166 46171 46135 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
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
46258 bytes +123 bytes (+0.27%) +32 bytes
46226 bytes +91 bytes (+0.20%)
46258 bytes +123 bytes (+0.27%) +32 bytes
46293 bytes +158 bytes (+0.34%) +67 bytes
46316 bytes +181 bytes (+0.39%) +90 bytes
46307 bytes +172 bytes (+0.37%) +81 bytes
46338 bytes +203 bytes (+0.44%) +112 bytes
46371 bytes +236 bytes (+0.51%) +145 bytes
46387 bytes +252 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.
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 34428 bytes -11707 bytes (-25.38%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 40393 bytes -5742 bytes (-12.45%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 41255 bytes -4880 bytes (-10.58%)
Brotli (Wikipedia) brotli brotli -q 11 42365 bytes -3770 bytes (-8.17%)
LZMA2 (Wikipedia) xz xz -9 43460 bytes -2675 bytes (-5.80%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 44724 bytes -1411 bytes (-3.06%)
ZSTD (Wikipedia) zstd zstd -19 44758 bytes -1377 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):


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 2018.
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