Choose a version:
26% The original file has 630597 bytes (615.8k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 164809 bytes (160.9k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  55641 bytes (54.3k)
local copy
gzip -9
  55586 bytes (54.3k)
local copy
libdeflate -12
  52933 bytes (51.7k)
local copy
7zip -mx=9 -tgzip
  52899 bytes (51.7k)
local copy
pigz -11 -n
  52863 bytes (51.6k)
local copy
kzip -s0 -rn -b1
  52850 bytes (51.6k)
local copy
Zopfli
  52762 bytes (51.5k)
local copy
Zopfli (defluff)
  52758 bytes (51.5k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.11.2.min.js

You will automatically get the smallest Dojo 1.11.2 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 June 13, 2016)
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 (52758 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://download.dojotoolkit.org/release-1.11.2/dojo.js --location | md5sum
7b0f699385af79758ddde197c719805c  -
curl --silent --compressed http://minime.stephan-brumme.com/files/dojo/dojo-1.11.2.min.zopfli.js.gz | md5sum
7b0f699385af79758ddde197c719805c  -

SHA1:
curl --silent --compressed http://download.dojotoolkit.org/release-1.11.2/dojo.js --location | sha1sum
2dbdb7a90153491654c7c2aae84551e59bbeac9f  -
curl --silent --compressed http://minime.stephan-brumme.com/files/dojo/dojo-1.11.2.min.zopfli.js.gz | sha1sum
2dbdb7a90153491654c7c2aae84551e59bbeac9f  -

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
52762 bytes -4 bytes zopfli --i1000000 --mls64 --bsr25 --lazy --ohh June 13, 2016 @ 13:27
52766 bytes -4 bytes zopfli --i100000 --mls64 --bsr25 --lazy --ohh June 10, 2016 @ 21:31
52770 bytes -2 bytes zopfli --i100000 --mls4096 --bsr6 --lazy --ohh June 10, 2016 @ 09:49
52772 bytes -10 bytes zopfli --i10000 --mls4096 --bsr6 --lazy --ohh June 10, 2016 @ 08:48
52782 bytes -4 bytes zopfli --i1000 --mls4096 --bsr6 --lazy --ohh June 10, 2016 @ 08:42
52786 bytes zopfli --i100 --mls4096 --bsr6 --lazy --ohh June 9, 2016 @ 19:06

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, 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
52776 52776 52779 52779 52780 52775 52775 52786 52775 52777 52787 52776 52788 52806 52792
52812 52778 52774 52780 52774 52773 52788 52782 52782 52782 52780 52775 52788 52784 52783
52815 52777 52773 52776 52789 52789 52786 52789 52785 52786 52780 52770 52783 52795 52789
52775 52811 52774 52813 52772 52773 52781 52780 52786 52778 52783 52786 52781 52782 52783
52811 52771 52777 52776 52774 52773 52778 52780 52785 52785 52777 52788 52786 52786 52783
52777 52805 52773 52810 52771 52773 52774 52779 52781 52785 52784 52776 52785 52781 52789
52776 52810 52777 52776 52773 52771 52775 52777 52781 52785 52776 52778 52782 52799 52790
52773 52774 52776 52776 52771 52771 52775 52773 52783 52785 52780 52785 52785 52781 52789
52807 52808 52776 52776 52774 52773 52773 52780 52783 52783 52779 52776 52785 52795 52784
52775 52777 52778 52783 52771 52771 52774 52774 52785 52785 52781 52776 52785 52787 52787
52763 52771 52778 52778 52774 52771 52788 52780 52781 52785 52781 52776 52785 52795 52785
52810 52812 52773 52811 52772 52774 52776 52778 52781 52784 52781 52778 52783 52781 52777
52811 52810 52804 52782 52775 52773 52775 52776 52786 52785 52777 52776 52792 52781 52785
52811 52809 52776 52782 52771 52772 52776 52780 52781 52786 52775 52780 52784 52781 52785
52775 52812 52777 52782 52771 52773 52774 52780 52781 52784 52781 52776 52793 52781 52786
52776 52813 52773 52776 52771 52776 52775 52774 52783 52787 52776 52776 52785 52781 52787
52807 52808 52779 52776 52771 52773 52775 52780 52783 52784 52781 52776 52782 52786 52785
52806 52804 52773 52783 52771 52773 52776 52778 52781 52786 52776 52776 52787 52781 52789
52807 52810 52776 52781 52771 52773 52775 52776 52780 52785 52781 52777 52783 52782 52785
52771 52810 52773 52772 52771 52777 52772 52776 52783 52785 52780 52776 52784 52781 52784
52813 52774 52811 52775 52772 52762 52774 52779 52780 52785 52782 52777 52784 52781 52785
52808 52810 52776 52781 52776 52772 52776 52779 52781 52787 52785 52773 52792 52788 52784
52810 52809 52810 52782 52775 52771 52773 52779 52781 52785 52779 52777 52782 52786 52781

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 52786 bytes 100%
1,000 52780 bytes -6 bytes 100%
10,000 52770 bytes -10 bytes 100%
100,000 52766 bytes -4 bytes 0.87%
1,000,000 52762 bytes -4 bytes 0.58%
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
52932 bytes +170 bytes (+0.32%) +82 bytes
52850 bytes +88 bytes (+0.17%)
52866 bytes +104 bytes (+0.20%) +16 bytes
52900 bytes +138 bytes (+0.26%) +50 bytes
52936 bytes +174 bytes (+0.33%) +86 bytes
52977 bytes +215 bytes (+0.41%) +127 bytes
52997 bytes +235 bytes (+0.45%) +147 bytes
53047 bytes +285 bytes (+0.54%) +197 bytes
53052 bytes +290 bytes (+0.55%) +202 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 38857 bytes -13905 bytes (-26.35%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46332 bytes -6430 bytes (-12.19%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47207 bytes -5555 bytes (-10.53%)
Brotli (Wikipedia) brotli brotli -q 11 48679 bytes -4083 bytes (-7.74%)
LZMA2 (Wikipedia) xz xz -9 49800 bytes -2962 bytes (-5.61%)
ZSTD (Wikipedia) zstd zstd -19 51304 bytes -1458 bytes (-2.76%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51442 bytes -1320 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