Choose a version:
26% The original file has 312194 bytes (304.9k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 81520 bytes (79.6k, 26%).

After GZIP compression these minified files vary in size:
Boot
  31889 bytes (31.1k)
CDN, direct link
Baidu
  27756 bytes (27.1k)
CDN, direct link
cdnjs
  27748 bytes (27.1k)
CDN, direct link
cdnhttps
  27734 bytes (27.1k)
CDN, direct link
gzip -6 (default)
  27650 bytes (27.0k)
local copy
gzip -9
  27615 bytes (27.0k)
local copy
Yandex
  27603 bytes (27.0k)
CDN, direct link
7zip -mx=9 -tgzip
  26452 bytes (25.8k)
local copy
kzip -s0 -rn -b6
  26417 bytes (25.8k)
local copy
libdeflate -12
  26412 bytes (25.8k)
local copy
pigz -11 -n
  26385 bytes (25.8k)
local copy
Zopfli
  26288 bytes (25.7k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.3.2.min.js

You will automatically get the smallest Dojo 1.3.2 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 1315 bytes by using my Dojo 1.3.2 Zopfli version instead of the best available CDN (5.00% smaller than Yandex, 26288 vs. 27603 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 --mls256 --bsr10 --lazy --ohh

(found December 1, 2015)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 256  --mls256
block splitting recursion 10  --bsr10
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-1.3.2/dojo.js --location | md5sum
b1f549685cac85056cea16803ac726d5  -
curl --silent --compressed http://minime.stephan-brumme.com/files/dojo/dojo-1.3.2.min.zopfli.js.gz | md5sum
b1f549685cac85056cea16803ac726d5  -

SHA1:
curl --silent --compressed http://download.dojotoolkit.org/release-1.3.2/dojo.js --location | sha1sum
ad44e1770895b7fa84aff5a56a0f99b855a83769  -
curl --silent --compressed http://minime.stephan-brumme.com/files/dojo/dojo-1.3.2.min.zopfli.js.gz | sha1sum
ad44e1770895b7fa84aff5a56a0f99b855a83769  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 31889 bytes b1f549685cac85056cea16803ac726d5 March 19, 2015 @ 15:30
cdnjs 27748 bytes b1f549685cac85056cea16803ac726d5 February 8, 2015 @ 14:45
Yandex 27603 bytes b1f549685cac85056cea16803ac726d5 June 20, 2013 @ 11:59

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
Baidu 27756 bytes d65e0bca2326a0282be3fd7431634fdf only whitespaces differ January 7, 2015 @ 10:16
cdnhttps 27734 bytes 97b53fad85581c1e5b447b71a651cddc < /*
< Copyright (c) 2004-2009, 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 a compiled version of Dojo, built for deployment [...]
< development. To get an editable version, please visit:
<
[...]
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:

1.12.2, 1.12.1,
1.11.4, 1.11.3, 1.11.2, 1.11.1, 1.11.0,
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
26288 bytes -1 byte zopfli --i100000 --mls256 --bsr10 --lazy --ohh December 1, 2015 @ 15:54
26289 bytes -2 bytes zopfli --i100000 --mls128 --bsr19 --lazy --ohh December 1, 2015 @ 14:58
26291 bytes -1 byte zopfli --i10000 --mls128 --bsr19 --lazy --ohh November 22, 2015 @ 22:08
26292 bytes -2 bytes zopfli --i10000 --mls32 --bsr25 --lazy --ohh September 23, 2015 @ 21:08
26294 bytes -2 bytes zopfli --i1000 --mls32 --bsr25 --lazy --ohh September 23, 2015 @ 20:47
26296 bytes -1 byte zopfli --i1000 --mls256 --bsr10 --lazy --ohh September 14, 2015 @ 21:58
26297 bytes -1 byte zopfli --i1000 --mls64 --bsr10 --lazy --ohh September 14, 2015 @ 21:50
26298 bytes -3 bytes zopfli --i1000 --mls512 --bsr13 --lazy --ohh September 11, 2015 @ 02:28
26301 bytes -3 bytes zopfli --i1000 --mls512 --bsr8 --lazy --ohh September 11, 2015 @ 02:27
26304 bytes zopfli --i100 --mls512 --bsr12 --lazy --ohh September 10, 2015 @ 14:58

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 @ 14:41.

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
26365 26370 26372 26373 26345 26377 26378 26381 26380 26380 26373 26368 26370 26374 26377
26340 26353 26305 26317 26340 26342 26311 26311 26365 26367 26366 26368 26374 26379 26370
26339 26350 26331 26329 26324 26371 26376 26371 26372 26371 26372 26375 26373 26369 26367
26346 26341 26344 26349 26337 26302 26377 26387 26371 26367 26366 26373 26376 26373 26367
26321 26356 26345 26309 26335 26338 26304 26293 26296 26368 26367 26373 26367 26370 26369
26341 26343 26318 26348 26341 26343 26307 26370 26296 26367 26368 26366 26373 26369 26368
26343 26342 26342 26335 26298 26294 26335 26288 26304 26366 26365 26369 26371 26374 26373
26339 26336 26342 26333 26318 26297 26297 26296 26308 26366 26365 26365 26379 26369 26373
26332 26325 26359 26325 26329 26331 26298 26368 26293 26367 26365 26367 26366 26371 26368
26331 26353 26336 26327 26314 26311 26295 26326 26293 26366 26365 26366 26383 26372 26368
26347 26340 26339 26319 26331 26292 26295 26299 26368 26369 26366 26367 26383 26373 26372
26357 26334 26346 26306 26313 26335 26294 26366 26294 26366 26366 26373 26383 26368 26368
26341 26343 26340 26314 26339 26299 26303 26300 26309 26369 26368 26367 26375 26372 26370
26341 26335 26347 26316 26342 26315 26327 26303 26304 26369 26365 26368 26375 26368 26369
26332 26341 26345 26339 26336 26329 26337 26384 26296 26369 26366 26370 26303 26370 26368
26341 26340 26343 26329 26337 26299 26289 26373 26294 26368 26372 26372 26371 26370 26370
26343 26334 26317 26338 26335 26343 26311 26295 26297 26367 26367 26369 26381 26373 26368
26342 26343 26342 26343 26344 26333 26299 26331 26295 26376 26365 26367 26378 26374 26370
26357 26311 26335 26340 26322 26344 26339 26371 26374 26372 26374 26374 26347 26372 26366
26342 26341 26341 26329 26293 26289 26296 26295 26294 26365 26366 26366 26372 26368 26370
26352 26309 26351 26327 26290 26293 26298 26371 26370 26372 26366 26366 26373 26372 26373
26339 26327 26343 26327 26331 26329 26296 26295 26312 26388 26368 26369 26380 26371 26368
26341 26338 26343 26339 26336 26333 26309 26295 26298 26366 26365 26365 26383 26374 26368

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 26301 bytes 100%
1,000 26294 bytes -7 bytes 100%
10,000 26291 bytes -3 bytes 100%
100,000 26288 bytes -3 bytes 1.16%
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
26420 bytes +132 bytes (+0.50%) +3 bytes
26418 bytes +130 bytes (+0.49%) +1 byte
26442 bytes +154 bytes (+0.59%) +25 bytes
26421 bytes +133 bytes (+0.51%) +4 bytes
26454 bytes +166 bytes (+0.63%) +37 bytes
26431 bytes +143 bytes (+0.54%) +14 bytes
26417 bytes +129 bytes (+0.49%)
26425 bytes +137 bytes (+0.52%) +8 bytes
26469 bytes +181 bytes (+0.69%) +52 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 21304 bytes -4984 bytes (-18.96%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 23361 bytes -2927 bytes (-11.13%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 24234 bytes -2054 bytes (-7.81%)
Brotli (Wikipedia) brotli brotli -q 11 24389 bytes -1899 bytes (-7.22%)
LZMA2 (Wikipedia) xz xz -9 25304 bytes -984 bytes (-3.74%)
ZSTD (Wikipedia) zstd zstd -19 25914 bytes -374 bytes (-1.42%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 26121 bytes -167 bytes (-0.64%)

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 2017.
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