Choose a version:
26% The original file has 625176 bytes (610.5k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 162159 bytes (158.4k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  54801 bytes (53.5k)
local copy
gzip -9
  54754 bytes (53.5k)
local copy
libdeflate -12
  52093 bytes (50.9k)
local copy
7zip -mx=9 -tgzip
  52075 bytes (50.9k)
local copy
pigz -11 -n
  52066 bytes (50.8k)
local copy
kzip -s0 -rn -b1
  52033 bytes (50.8k)
local copy
Zopfli
  51954 bytes (50.7k)
local copy
Zopfli (defluff)
  51953 bytes (50.7k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.9.11.min.js

You will automatically get the smallest Dojo 1.9.11 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 --i100000 --mb8 --mls2048 --bsr16 --lazy --ohh

(found March 21, 2017)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 2048  --mls2048
block splitting recursion 16  --bsr16
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 (51953 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://download.dojotoolkit.org/release-1.9.11/dojo.js --location | md5sum
bb9d71434323e78f23e950cbc18b7e52  -
curl --silent --compressed http://minime.stephan-brumme.com/files/dojo/dojo-1.9.11.min.zopfli.js.gz | md5sum
bb9d71434323e78f23e950cbc18b7e52  -

SHA1:
curl --silent --compressed http://download.dojotoolkit.org/release-1.9.11/dojo.js --location | sha1sum
151a9d3830a5dfa501797d9bacfc84668afb6ac0  -
curl --silent --compressed http://minime.stephan-brumme.com/files/dojo/dojo-1.9.11.min.zopfli.js.gz | sha1sum
151a9d3830a5dfa501797d9bacfc84668afb6ac0  -

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
51954 bytes -3 bytes zopfli --i100000 --mls2048 --bsr16 --lazy --ohh March 21, 2017 @ 15:15
51957 bytes -1 byte zopfli --i100000 --mls2048 --bsr30 --lazy --ohh March 21, 2017 @ 14:15
51958 bytes -1 byte zopfli --i10000 --mls2048 --bsr30 --lazy --ohh March 17, 2017 @ 14:25
51959 bytes -1 byte zopfli --i10000 --mls16 --bsr11 --lazy --ohh March 17, 2017 @ 04:22
51960 bytes -4 bytes zopfli --i10000 --mls64 --bsr8 --lazy --ohh March 17, 2017 @ 03:14
51964 bytes -1 byte zopfli --i1000 --mls32 --bsr18 --lazy --ohh March 17, 2017 @ 00:17
51965 bytes -4 bytes zopfli --i1000 --mls16 --bsr9 --lazy --ohh March 17, 2017 @ 00:10
51969 bytes zopfli --i100 --mls16 --bsr30 --lazy --ohh March 11, 2017 @ 05:04

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

Most recent activity on March 22, 2017 @ 07:57.

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
51965 51964 51969 51967 51965 51967 51962 51962 51981 51980 51981 51978 51981 51981 51983
51976 51971 51963 51963 51962 51976 51970 51969 51966 51976 51965 51973 51972 51975 51967
51972 51971 51971 51964 51974 51961 51965 51965 51967 51973 51966 51972 51978 51981 51979
51973 51971 51976 51993 51965 51959 51967 51963 51960 51972 51963 51973 51975 51971 51977
51971 51974 51972 51959 51959 51960 51962 51977 51971 51977 51971 51977 51971 51972 51971
51961 51964 51960 51959 51964 51964 51963 51963 51967 51971 51963 51979 51977 51965 51974
51963 51971 51960 51964 51963 51965 51962 51962 51967 51976 51963 51974 51977 51972 51971
51962 51964 51964 51959 51962 51961 51965 51963 51960 51971 51963 51970 51975 51985 51971
51964 51963 51961 51960 51963 51959 51964 51963 51966 51971 51967 51973 51978 51966 51972
51974 51971 51970 51960 51960 51973 51961 51972 51966 51970 51955 51971 51970 51970 51980
51961 51963 51960 51959 51960 51960 51965 51960 51962 51967 51963 51971 51977 51969 51981
51973 51971 51962 51960 51963 51973 51960 51970 51961 51973 51963 51972 51973 51969 51976
51970 51971 51973 51963 51962 51963 51964 51971 51966 51968 51954 51972 51977 51965 51974
51962 51971 51960 51959 51961 51962 51962 51960 51966 51979 51963 51972 51977 51965 51968
51971 51970 51971 51959 51960 51974 51962 51972 51966 51978 51964 51973 51975 51970 51974
51972 51971 51971 51962 51965 51965 51963 51972 51965 51970 51965 51972 51977 51966 51971
51962 51971 51963 51959 51960 51961 51961 51962 51972 51971 51963 51971 51976 51970 51964
51962 51963 51960 51961 51962 51962 51961 51964 51965 51971 51963 51973 51969 51971 51971
51970 51971 51961 51959 51963 51975 51965 51970 51967 51972 51967 51978 51970 51970 51964
51961 51972 51971 51965 51960 51963 51966 51961 51966 51973 51963 51970 51976 51966 51972
51971 51973 51973 51959 51962 51962 51965 51969 51961 51977 51972 51971 51976 51979 51972
51959 51963 51971 51959 51963 51960 51964 51972 51962 51972 51957 51971 51977 51981 51981
51974 51969 51961 51960 51963 51962 51961 51966 51960 51974 51963 51971 51977 51971 51973

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 51969 bytes 100%
1,000 51964 bytes -5 bytes 100%
10,000 51958 bytes -6 bytes 100%
100,000 51954 bytes -4 bytes 0.87%
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
52103 bytes +149 bytes (+0.29%) +70 bytes
52033 bytes +79 bytes (+0.15%)
52035 bytes +81 bytes (+0.16%) +2 bytes
52071 bytes +117 bytes (+0.23%) +38 bytes
52093 bytes +139 bytes (+0.27%) +60 bytes
52141 bytes +187 bytes (+0.36%) +108 bytes
52168 bytes +214 bytes (+0.41%) +135 bytes
52189 bytes +235 bytes (+0.45%) +156 bytes
52188 bytes +234 bytes (+0.45%) +155 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 38340 bytes -13614 bytes (-26.20%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 45675 bytes -6279 bytes (-12.09%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 46582 bytes -5372 bytes (-10.34%)
Brotli (Wikipedia) brotli brotli -q 11 47933 bytes -4021 bytes (-7.74%)
LZMA2 (Wikipedia) xz xz -9 49056 bytes -2898 bytes (-5.58%)
ZSTD (Wikipedia) zstd zstd -19 50515 bytes -1439 bytes (-2.77%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 50720 bytes -1234 bytes (-2.38%)

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