Choose a version:
25% The original file has 546032 bytes (533.2k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 137786 bytes (134.6k, 25%).

After GZIP compression these minified files vary in size:
Boot
  55105 bytes (53.8k)
CDN
cdnhttps
  48071 bytes (46.9k)
CDN
Baidu
  47938 bytes (46.8k)
CDN
cdnjs
  47933 bytes (46.8k)
CDN
gzip -6 (default)
  47762 bytes (46.6k)
local copy
gzip -9
  47731 bytes (46.6k)
local copy
Yandex
  47722 bytes (46.6k)
CDN
libdeflate -12
  45562 bytes (44.5k)
local copy
7zip -mx=9 -tgzip
  45484 bytes (44.4k)
local copy
kzip -s0 -rn -b1
  45409 bytes (44.3k)
local copy
pigz -11 -n
  45388 bytes (44.3k)
local copy
Zopfli
  45305 bytes (44.2k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.7.2.min.js

You will automatically get the smallest Dojo 1.7.2 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 2417 bytes by using my Dojo 1.7.2 Zopfli version instead of the best available CDN (5.33% smaller than Yandex, 45305 vs. 47722 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 --mls8192 --bsr20 --lazy --ohh

(found December 2, 2015)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 8192  --mls8192
block splitting recursion 20  --bsr20
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-1.7.2/dojo.js --location | md5sum
83f4e75a7c78181e6a364d852f5397b4  -
curl --silent --compressed http://minime.stephan-brumme.com/files/dojo/dojo-1.7.2.min.zopfli.js.gz | md5sum
83f4e75a7c78181e6a364d852f5397b4  -

SHA1:
curl --silent --compressed http://download.dojotoolkit.org/release-1.7.2/dojo.js --location | sha1sum
36856361c0a40bdfc111adaef5c3139511787d46  -
curl --silent --compressed http://minime.stephan-brumme.com/files/dojo/dojo-1.7.2.min.zopfli.js.gz | sha1sum
36856361c0a40bdfc111adaef5c3139511787d46  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 55105 bytes 83f4e75a7c78181e6a364d852f5397b4 March 19, 2015 @ 15:34
cdnjs 47933 bytes 83f4e75a7c78181e6a364d852f5397b4 February 8, 2015 @ 14:45

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
cdnhttps 48071 bytes cbf69986fee0c9c63cb9c7013a7862bf < /*
< 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
Baidu 47938 bytes 5720574194f84d45b11a3c60a4c8553c only whitespaces differ January 7, 2015 @ 10:16
Yandex 47722 bytes 50b9955c1eef6d14e234eea2aab42d09 < (function(_1,_2){var _3=function(){},_4=function(it){for(v [...]
> (function(_1,_2){var _3=function(){},_4=function(it){for(v [...]
June 20, 2013 @ 11:59

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
45305 bytes -5 bytes zopfli --i100000 --mls8192 --bsr20 --lazy --ohh December 2, 2015 @ 14:45
45310 bytes -6 bytes zopfli --i10000 --mls8192 --bsr20 --lazy --ohh November 22, 2015 @ 22:36
45316 bytes -2 bytes zopfli --i1000 --mls8192 --bsr20 --lazy --ohh September 20, 2015 @ 01:31
45318 bytes -3 bytes zopfli --i1000 --mls8192 --bsr9 --lazy --ohh September 10, 2015 @ 22:24
45321 bytes zopfli --i100 --mls8192 --bsr10 --lazy --ohh September 10, 2015 @ 15:15

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 @ 14:38.

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
45324 45329 45324 45323 45330 45327 45327 45324 45327 45323 45321 45336 45354 45343 45345
45317 45327 45325 45315 45323 45324 45327 45327 45324 45338 45331 45334 45354 45347 45329
45326 45322 45325 45324 45323 45322 45323 45323 45324 45335 45331 45332 45339 45323 45323
45323 45320 45323 45323 45323 45332 45349 45324 45333 45334 45335 45342 45338 45332 45343
45323 45325 45323 45323 45324 45322 45321 45320 45322 45339 45331 45337 45323 45317 45317
45333 45325 45330 45318 45323 45338 45324 45322 45324 45340 45331 45342 45307 45315 45337
45318 45323 45323 45323 45323 45332 45326 45326 45323 45339 45335 45336 45307 45345 45328
45332 45319 45325 45318 45325 45330 45324 45326 45323 45341 45330 45332 45333 45326 45338
45326 45319 45323 45321 45320 45340 45324 45325 45322 45345 45329 45336 45322 45348 45337
45326 45326 45334 45324 45323 45325 45325 45325 45322 45339 45331 45334 45323 45345 45321
45324 45321 45323 45323 45322 45332 45322 45324 45324 45334 45329 45334 45331 45318 45317
45323 45322 45326 45324 45324 45331 45325 45324 45324 45333 45330 45334 45343 45320 45343
45324 45321 45323 45323 45321 45331 45324 45324 45326 45324 45329 45335 45313 45319 45338
45324 45326 45330 45325 45323 45330 45323 45324 45326 45339 45331 45333 45333 45342 45337
45324 45323 45330 45317 45323 45336 45323 45325 45320 45335 45330 45332 45339 45338 45337
45323 45323 45327 45320 45321 45329 45323 45324 45322 45340 45330 45336 45324 45317 45339
45327 45324 45330 45318 45323 45330 45322 45321 45319 45339 45330 45333 45305 45316 45337
45325 45320 45323 45324 45321 45338 45327 45322 45326 45335 45330 45338 45306 45325 45335
45317 45322 45324 45323 45323 45330 45321 45323 45324 45324 45330 45333 45323 45334 45338
45323 45324 45327 45326 45323 45331 45323 45326 45322 45349 45331 45333 45323 45333 45344
45324 45323 45324 45325 45323 45322 45323 45329 45323 45332 45331 45337 45319 45320 45335
45324 45320 45330 45321 45323 45331 45324 45324 45321 45334 45329 45340 45337 45332 45327
45318 45319 45325 45320 45321 45338 45324 45326 45323 45343 45330 45333 45328 45322 45336

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 45320 bytes 100%
1,000 45316 bytes -4 bytes 100%
10,000 45310 bytes -6 bytes 100%
100,000 45305 bytes -5 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
45430 bytes +125 bytes (+0.28%) +21 bytes
45409 bytes +104 bytes (+0.23%)
45431 bytes +126 bytes (+0.28%) +22 bytes
45463 bytes +158 bytes (+0.35%) +54 bytes
45494 bytes +189 bytes (+0.42%) +85 bytes
45475 bytes +170 bytes (+0.38%) +66 bytes
45500 bytes +195 bytes (+0.43%) +91 bytes
45542 bytes +237 bytes (+0.52%) +133 bytes
45572 bytes +267 bytes (+0.59%) +163 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 33888 bytes -11417 bytes (-25.20%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 39726 bytes -5579 bytes (-12.31%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 40380 bytes -4925 bytes (-10.87%)
Brotli (Wikipedia) brotli brotli -q 11 41706 bytes -3599 bytes (-7.94%)
LZMA2 (Wikipedia) xz xz -9 42708 bytes -2597 bytes (-5.73%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 43984 bytes -1321 bytes (-2.92%)
ZSTD (Wikipedia) zstd zstd -19 44015 bytes -1290 bytes (-2.85%)

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