Choose a version:
26% The original file has 629493 bytes (614.7k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 163811 bytes (160.0k, 26%).

After GZIP compression these minified files vary in size:
Boot
  64880 bytes (63.4k)
CDN
cdnhttps
  56312 bytes (55.0k)
CDN
cdnjs
  56230 bytes (54.9k)
CDN
gzip -6 (default)
  55961 bytes (54.6k)
local copy
gzip -9
  55905 bytes (54.6k)
local copy
7zip -mx=9 -tgzip
  53256 bytes (52.0k)
local copy
libdeflate -12
  53238 bytes (52.0k)
local copy
kzip -s0 -rn -b1
  53188 bytes (51.9k)
local copy
pigz -11 -n
  53186 bytes (51.9k)
local copy
Zopfli
  53012 bytes (51.8k)
local copy
Zopfli (defluff)
  53009 bytes (51.8k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.10.2.min.js

You will automatically get the smallest Dojo 1.10.2 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 3218 bytes by using my Dojo 1.10.2 Zopfli version instead of the best available CDN (6.07% smaller than cdnjs, 53012 vs. 56230 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 --mls2 --bsr9 --lazy --ohh

(found December 7, 2015)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 2  --mls2
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

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 (53009 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://download.dojotoolkit.org/release-1.10.2/dojo.js --location | md5sum
321676aeb263b361d2d6f4d37987bfc4  -
curl --silent --compressed http://minime.stephan-brumme.com/files/dojo/dojo-1.10.2.min.zopfli.js.gz | md5sum
321676aeb263b361d2d6f4d37987bfc4  -

SHA1:
curl --silent --compressed http://download.dojotoolkit.org/release-1.10.2/dojo.js --location | sha1sum
b790fa901ab73de2e7653e2ead2d620a9dfd3034  -
curl --silent --compressed http://minime.stephan-brumme.com/files/dojo/dojo-1.10.2.min.zopfli.js.gz | sha1sum
b790fa901ab73de2e7653e2ead2d620a9dfd3034  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 64880 bytes 321676aeb263b361d2d6f4d37987bfc4 March 19, 2015 @ 15:28
cdnjs 56230 bytes 321676aeb263b361d2d6f4d37987bfc4 February 8, 2015 @ 14:45

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
cdnhttps 56312 bytes 855e409ca63f7ca5bcc176de39dd8de0 < /*
< 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
53012 bytes -1 byte zopfli --i100000 --mls2 --bsr9 --lazy --ohh December 7, 2015 @ 12:37
53013 bytes -1 byte zopfli --i100000 --mls2 --bsr16 --lazy --ohh December 7, 2015 @ 11:09
53014 bytes -1 byte zopfli --i100000 --mls4 --bsr12 --lazy --ohh December 7, 2015 @ 10:33
53015 bytes -1 byte zopfli --i10000 --mls2 --bsr8 --lazy --ohh September 25, 2015 @ 06:44
53016 bytes -2 bytes zopfli --i10000 --mls2 --bsr30 --lazy --ohh September 25, 2015 @ 04:35
53018 bytes -1 byte zopfli --i10000 --mls4 --bsr21 --lazy --ohh September 25, 2015 @ 04:30
53019 bytes -4 bytes zopfli --i10000 --mls4 --bsr18 --lazy --ohh September 25, 2015 @ 02:51
53023 bytes -1 byte zopfli --i1000 --mls2 --bsr17 --lazy --ohh September 22, 2015 @ 14:11
53024 bytes -1 byte zopfli --i1000 --mls4 --bsr6 --lazy --ohh September 21, 2015 @ 14:19
53025 bytes -2 bytes zopfli --i1000 --mls4 --bsr15 --lazy --ohh September 21, 2015 @ 14:12
53027 bytes zopfli --i100 --mls4 --bsr15 --lazy --ohh September 21, 2015 @ 13:27

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 @ 14:40.

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
53058 53067 53086 53086 53085 53089 53092 53098 53098 53092 53116 53091 53093 53126 53099
53024 53027 53038 53028 53086 53088 53096 53104 53089 53097 53096 53098 53104 53094 53094
53034 53018 53042 53033 53088 53088 53089 53095 53090 53143 53092 53101 53097 53098 53096
53117 53116 53125 53088 53098 53089 53088 53088 53091 53111 53092 53089 53090 53106 53092
53013 53021 53036 53042 53082 53089 53096 53093 53088 53090 53105 53104 53101 53101 53090
53012 53047 53032 53034 53084 53089 53093 53093 53089 53087 53098 53089 53102 53103 53097
53044 53046 53048 53086 53084 53089 53091 53088 53089 53095 53095 53091 53088 53103 53099
53013 53020 53032 53087 53086 53083 53100 53099 53088 53094 53097 53101 53097 53094 53089
53018 53014 53046 53033 53092 53085 53084 53088 53090 53093 53097 53101 53100 53096 53095
53029 53020 53030 53032 53085 53094 53089 53095 53088 53099 53104 53089 53100 53096 53091
53013 53019 53038 53043 53085 53084 53084 53089 53098 53111 53095 53089 53097 53100 53090
53018 53013 53035 53033 53088 53085 53088 53085 53089 53103 53103 53089 53090 53106 53093
53013 53019 53029 53034 53086 53089 53087 53100 53088 53098 53096 53090 53096 53096 53097
53013 53023 53026 53033 53087 53087 53095 53093 53088 53098 53100 53089 53099 53097 53092
53019 53019 53045 53049 53086 53086 53094 53094 53088 53105 53097 53090 53097 53093 53098
53030 53020 53028 53041 53086 53086 53087 53088 53088 53102 53137 53103 53099 53095 53093
53063 53067 53087 53087 53087 53086 53093 53094 53088 53099 53095 53089 53091 53097 53096
53012 53018 53033 53031 53086 53087 53094 53088 53089 53093 53094 53089 53091 53097 53104
53023 53021 53033 53031 53085 53087 53094 53091 53088 53094 53097 53090 53098 53115 53088
53068 53059 53107 53087 53087 53084 53104 53087 53089 53097 53097 53089 53088 53112 53089
53057 53059 53072 53086 53086 53086 53088 53088 53089 53093 53099 53089 53090 53094 53089
53012 53059 53089 53086 53084 53087 53086 53089 53089 53097 53094 53089 53090 53098 53090
53013 53026 53028 53031 53085 53083 53087 53087 53088 53093 53099 53089 53089 53098 53090

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 53026 bytes 100%
1,000 53023 bytes -3 bytes 100%
10,000 53015 bytes -8 bytes 100%
100,000 53012 bytes -3 bytes 3.19%
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
53258 bytes +246 bytes (+0.46%) +70 bytes
53188 bytes +176 bytes (+0.33%)
53207 bytes +195 bytes (+0.37%) +19 bytes
53258 bytes +246 bytes (+0.46%) +70 bytes
53289 bytes +277 bytes (+0.52%) +101 bytes
53325 bytes +313 bytes (+0.59%) +137 bytes
53327 bytes +315 bytes (+0.59%) +139 bytes
53355 bytes +343 bytes (+0.65%) +167 bytes
53398 bytes +386 bytes (+0.73%) +210 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 38850 bytes -14162 bytes (-26.71%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46085 bytes -6927 bytes (-13.07%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47558 bytes -5454 bytes (-10.29%)
Brotli (Wikipedia) brotli brotli -q 11 48655 bytes -4357 bytes (-8.22%)
LZMA2 (Wikipedia) xz xz -9 49772 bytes -3240 bytes (-6.11%)
ZSTD (Wikipedia) zstd zstd -19 51253 bytes -1759 bytes (-3.32%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51284 bytes -1728 bytes (-3.26%)

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