Choose a version:
26% The original file has 636162 bytes (621.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 166591 bytes (162.7k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  56065 bytes (54.8k)
local copy
gzip -9
  56004 bytes (54.7k)
local copy
libdeflate -12
  53352 bytes (52.1k)
local copy
7zip -mx=9 -tgzip
  53336 bytes (52.1k)
local copy
kzip -s0 -rn -b0
  53239 bytes (52.0k)
local copy
pigz -11 -n
  53238 bytes (52.0k)
local copy
Zopfli
  53162 bytes (51.9k)
local copy
Zopfli (defluff)
  53158 bytes (51.9k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.13.2.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.13.2 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

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 --mls64 --bsr25 --lazy --ohh

(found October 4, 2018)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 64  --mls64
block splitting recursion 25  --bsr25
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 4 more bytes (53158 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.2/dojo.js --location | md5sum
34e5df94120bc749346deb6b9abb383e  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.2.min.zopfli.js.gz | md5sum
34e5df94120bc749346deb6b9abb383e  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.2/dojo.js --location | sha1sum
2a13867c63a82a8b28ffd567a69ceb84487d4cb4  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.2.min.zopfli.js.gz | sha1sum
2a13867c63a82a8b28ffd567a69ceb84487d4cb4  -

Other Versions

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

1.14.2, 1.14.1, 1.14.0,
1.13.3, 1.13.2, 1.13.1, 1.13.0,
1.12.4, 1.12.3, 1.12.2, 1.12.1,
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,
1.6.3, 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
53162 bytes -2 bytes zopfli --i1000000 --mls64 --bsr25 --lazy --ohh October 4, 2018 @ 20:52
53164 bytes -4 bytes zopfli --i100000 --mls64 --bsr25 --lazy --ohh October 4, 2018 @ 12:10
53168 bytes -1 byte zopfli --i10000 --mls64 --bsr25 --lazy --ohh October 3, 2018 @ 02:58
53169 bytes -1 byte zopfli --i10000 --mls128 --bsr19 --lazy --ohh October 2, 2018 @ 20:14
53170 bytes -1 byte zopfli --i10000 --mls4 --bsr17 --lazy --ohh October 2, 2018 @ 19:13
53171 bytes -3 bytes zopfli --i10000 --mls4 --bsr11 --lazy --ohh October 2, 2018 @ 19:07
53174 bytes -1 byte zopfli --i1000 --mls4 --bsr17 --lazy --ohh October 2, 2018 @ 12:34
53175 bytes -1 byte zopfli --i1000 --mls4 --bsr22 --lazy --ohh October 2, 2018 @ 12:32
53176 bytes zopfli --i100 --mls4 --bsr9 --lazy --ohh October 2, 2018 @ 11:08

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

Most recent activity on October 4, 2018 @ 22:30.

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
53171 53171 53173 53174 53172 53172 53172 53171 53172 53178 53187 53175 53184 53210 53191
53208 53171 53173 53174 53181 53186 53171 53173 53179 53179 53181 53180 53186 53181 53193
53209 53177 53172 53175 53180 53183 53173 53172 53185 53174 53189 53179 53184 53181 53180
53220 53204 53213 53174 53173 53186 53170 53173 53183 53176 53179 53180 53184 53194 53186
53204 53170 53172 53172 53175 53186 53171 53172 53183 53187 53188 53174 53187 53191 53185
53211 53170 53173 53173 53176 53177 53172 53171 53182 53186 53187 53175 53182 53196 53195
53172 53173 53170 53211 53174 53172 53181 53171 53182 53184 53198 53175 53191 53187 53188
53171 53171 53172 53172 53177 53175 53170 53170 53183 53187 53186 53184 53185 53175 53182
53172 53171 53172 53177 53175 53177 53170 53174 53183 53174 53187 53186 53184 53191 53185
53209 53171 53172 53175 53175 53180 53170 53172 53182 53186 53188 53186 53190 53190 53185
53171 53172 53170 53175 53176 53176 53170 53178 53183 53174 53197 53187 53186 53188 53179
53211 53171 53179 53173 53174 53174 53170 53173 53183 53189 53198 53183 53185 53194 53186
53212 53204 53165 53172 53172 53186 53172 53172 53183 53187 53185 53186 53185 53181 53181
53207 53170 53173 53171 53172 53188 53171 53183 53183 53176 53191 53174 53182 53180 53189
53171 53170 53173 53172 53176 53174 53170 53183 53183 53181 53184 53173 53184 53191 53181
53172 53171 53173 53173 53172 53200 53166 53172 53183 53187 53188 53175 53183 53192 53187
53208 53204 53173 53174 53177 53190 53173 53183 53184 53189 53198 53184 53182 53184 53195
53208 53205 53172 53174 53175 53173 53173 53171 53183 53187 53189 53187 53184 53189 53188
53215 53171 53173 53174 53175 53172 53170 53176 53183 53188 53201 53187 53183 53174 53181
53171 53173 53171 53173 53175 53175 53170 53172 53182 53187 53189 53174 53185 53187 53175
53204 53204 53171 53173 53171 53162 53170 53182 53182 53185 53188 53174 53185 53188 53186
53206 53215 53173 53173 53172 53171 53171 53172 53183 53188 53188 53174 53184 53192 53175
53209 53170 53170 53172 53171 53170 53173 53172 53183 53184 53196 53186 53189 53180 53188

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 53176 bytes 100%
1,000 53174 bytes -2 bytes 100%
10,000 53168 bytes -6 bytes 100%
100,000 53164 bytes -4 bytes 0.87%
1,000,000 53162 bytes -2 bytes 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
53239 bytes +77 bytes (+0.14%)
53256 bytes +94 bytes (+0.18%) +17 bytes
53277 bytes +115 bytes (+0.22%) +38 bytes
53306 bytes +144 bytes (+0.27%) +67 bytes
53248 bytes +86 bytes (+0.16%) +9 bytes
53279 bytes +117 bytes (+0.22%) +40 bytes
53285 bytes +123 bytes (+0.23%) +46 bytes
53279 bytes +117 bytes (+0.22%) +40 bytes
53319 bytes +157 bytes (+0.30%) +80 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 - but your browser doesn't support it.
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 39096 bytes -14066 bytes (-26.46%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46643 bytes -6519 bytes (-12.26%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47587 bytes -5575 bytes (-10.49%)
Brotli (Wikipedia) brotli brotli -q 11 49135 bytes -4027 bytes (-7.57%)
LZMA2 (Wikipedia) xz xz -9 50168 bytes -2994 bytes (-5.63%)
Zstandard (Wikipedia) zstd zstd -19 51596 bytes -1566 bytes (-2.95%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51843 bytes -1319 bytes (-2.48%)

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