Choose a version:
26% The original file has 634185 bytes (619.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165807 bytes (161.9k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  55917 bytes (54.6k)
local copy
gzip -9
  55865 bytes (54.6k)
local copy
libdeflate -12
  53208 bytes (52.0k)
local copy
7zip -mx=9 -tgzip
  53191 bytes (51.9k)
local copy
pigz -11 -n
  53122 bytes (51.9k)
local copy
kzip -s0 -rn -b1
  53107 bytes (51.9k)
local copy
Zopfli
  53015 bytes (51.8k)
local copy
Zopfli (defluff)
  53014 bytes (51.8k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.11.5.min.js

You will automatically get the smallest Dojo 1.11.5 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 --mls8 --bsr15 --lazy --ohh

(found September 28, 2017)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 8  --mls8
block splitting recursion 15  --bsr15
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 1 more byte (53014 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://download.dojotoolkit.org/release-1.11.5/dojo.js --location | md5sum
db34b89a6675040994cd52fcb562b074  -
curl --silent --compressed http://minime.stephan-brumme.com/files/dojo/dojo-1.11.5.min.zopfli.js.gz | md5sum
db34b89a6675040994cd52fcb562b074  -

SHA1:
curl --silent --compressed http://download.dojotoolkit.org/release-1.11.5/dojo.js --location | sha1sum
badec07240ae03d5311138a299a877537a9a0b0e  -
curl --silent --compressed http://minime.stephan-brumme.com/files/dojo/dojo-1.11.5.min.zopfli.js.gz | sha1sum
badec07240ae03d5311138a299a877537a9a0b0e  -

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
53015 bytes -2 bytes zopfli --i1000000 --mls8 --bsr15 --lazy --ohh September 28, 2017 @ 19:48
53017 bytes -6 bytes zopfli --i100000 --mls8 --bsr15 --lazy --ohh September 27, 2017 @ 23:21
53023 bytes -4 bytes zopfli --i10000 --mls8 --bsr15 --lazy --ohh September 27, 2017 @ 17:00
53027 bytes -4 bytes zopfli --i10000 --mls2 --bsr22 --lazy --ohh September 27, 2017 @ 16:52
53031 bytes -1 byte zopfli --i1000 --mls2 --bsr20 --lazy --ohh September 27, 2017 @ 14:40
53032 bytes -2 bytes zopfli --i1000 --mls8 --bsr20 --lazy --ohh September 27, 2017 @ 14:39
53034 bytes zopfli --i100 --mls8 --bsr20 --lazy --ohh September 27, 2017 @ 14:11

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

Most recent activity on September 29, 2017 @ 21:25.

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
53026 53026 53027 53027 53029 53029 53031 53031 53029 53027 53042 53031 53039 53057 53058
53029 53029 53041 53031 53028 53034 53026 53027 53029 53034 53037 53032 53039 53037 53057
53024 53028 53028 53030 53039 53018 53024 53037 53033 53035 53035 53034 53034 53042 53034
53060 53071 53024 53044 53029 53039 53034 53028 53034 53031 53032 53031 53036 53050 53039
53028 53063 53029 53029 53029 53047 53028 53031 53029 53033 53039 53038 53038 53039 53046
53060 53024 53027 53031 53028 53032 53018 53027 53029 53034 53036 53032 53035 53041 53035
53067 53062 53070 53042 53047 53027 53025 53027 53033 53034 53038 53029 53035 53041 53047
53028 53060 53061 53027 53029 53029 53017 53030 53026 53035 53040 53031 53034 53041 53036
53027 53059 53031 53028 53032 53027 53024 53029 53035 53034 53039 53030 53039 53038 53043
53027 53027 53062 53030 53025 53029 53024 53027 53030 53037 53038 53041 53034 53041 53038
53028 53061 53031 53025 53028 53031 53027 53030 53033 53035 53038 53031 53037 53035 53039
53060 53060 53015 53030 53029 53030 53016 53026 53034 53033 53037 53030 53035 53050 53035
53063 53060 53024 53042 53033 53024 53024 53027 53032 53034 53037 53031 53034 53040 53045
53027 53059 53061 53029 53031 53027 53026 53030 53028 53034 53039 53031 53038 53040 53043
53028 53059 53060 53040 53032 53019 53018 53026 53030 53032 53035 53030 53041 53041 53043
53065 53060 53060 53030 53033 53029 53016 53029 53028 53035 53038 53030 53039 53041 53039
53027 53058 53024 53019 53029 53027 53027 53028 53032 53034 53038 53030 53036 53035 53037
53059 53058 53024 53028 53028 53028 53031 53028 53035 53034 53037 53031 53036 53035 53045
53027 53063 53059 53026 53029 53027 53027 53029 53032 53034 53038 53028 53034 53041 53043
53030 53022 53027 53025 53029 53029 53027 53029 53029 53035 53039 53024 53034 53041 53043
53027 53060 53017 53026 53029 53029 53024 53029 53033 53034 53038 53030 53040 53035 53044
53059 53019 53024 53026 53033 53016 53028 53026 53029 53033 53040 53031 53035 53038 53035
53028 53060 53029 53026 53033 53027 53028 53027 53034 53034 53038 53029 53038 53042 53045

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 53034 bytes 100%
1,000 53031 bytes -3 bytes 100%
10,000 53023 bytes -8 bytes 100%
100,000 53017 bytes -6 bytes 3.77%
1,000,000 53015 bytes -2 bytes 1.74%
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
53115 bytes +100 bytes (+0.19%) +8 bytes
53107 bytes +92 bytes (+0.17%)
53137 bytes +122 bytes (+0.23%) +30 bytes
53166 bytes +151 bytes (+0.28%) +59 bytes
53115 bytes +100 bytes (+0.19%) +8 bytes
53156 bytes +141 bytes (+0.27%) +49 bytes
53190 bytes +175 bytes (+0.33%) +83 bytes
53224 bytes +209 bytes (+0.39%) +117 bytes
53235 bytes +220 bytes (+0.41%) +128 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 38987 bytes -14028 bytes (-26.46%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46525 bytes -6490 bytes (-12.24%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47409 bytes -5606 bytes (-10.57%)
Brotli (Wikipedia) brotli brotli -q 11 48889 bytes -4126 bytes (-7.78%)
LZMA2 (Wikipedia) xz xz -9 50044 bytes -2971 bytes (-5.60%)
ZSTD (Wikipedia) zstd zstd -19 51632 bytes -1383 bytes (-2.61%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51692 bytes -1323 bytes (-2.50%)

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