Choose a version:
26% The original file has 632881 bytes (618.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165776 bytes (161.9k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  55864 bytes (54.6k)
local copy
gzip -9
  55812 bytes (54.5k)
local copy
libdeflate -12
  53162 bytes (51.9k)
local copy
7zip -mx=9 -tgzip
  53139 bytes (51.9k)
local copy
pigz -11 -n
  53070 bytes (51.8k)
local copy
kzip -s0 -rn -b1
  53063 bytes (51.8k)
local copy
Zopfli
  52969 bytes (51.7k)
local copy
Zopfli (defluff)
  52968 bytes (51.7k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.12.4.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.12.4 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 --bsr40 --lazy --ohh

(found October 5, 2018)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 8  --mls8
block splitting recursion 40  --bsr40
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 (52968 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.4/dojo.js --location | md5sum
0b9fd25304570a8cdb4783d57055510d  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.4.min.zopfli.js.gz | md5sum
0b9fd25304570a8cdb4783d57055510d  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.4/dojo.js --location | sha1sum
362fb3364719770e0775a16d0f97c1a1584551a4  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.4.min.zopfli.js.gz | sha1sum
362fb3364719770e0775a16d0f97c1a1584551a4  -

Other Versions

Available Dojo versions at minime.stephan-brumme.com:

1.14.2, 1.14.1, 1.14.0,
1.13.3, 1.13.2, 1.13.1, 1.13.0,
1.12.4, 1.12.3, 1.12.2, 1.12.1,
1.11.6, 1.11.5, 1.11.4, 1.11.3, 1.11.2, 1.11.1, 1.11.0,
1.10.10, 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,
1.8.14, 1.8.13, 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,
1.7.12, 1.7.11, 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
52969 bytes -1 byte zopfli --i1000000 --mls8 --bsr40 --lazy --ohh October 5, 2018 @ 04:22
52970 bytes -7 bytes zopfli --i100000 --mls8 --bsr40 --lazy --ohh October 4, 2018 @ 11:00
52977 bytes -1 byte zopfli --i10000 --mls8 --bsr40 --lazy --ohh October 2, 2018 @ 16:33
52978 bytes -1 byte zopfli --i10000 --mls64 --bsr30 --lazy --ohh October 2, 2018 @ 15:57
52979 bytes -4 bytes zopfli --i10000 --mls2 --bsr25 --lazy --ohh October 2, 2018 @ 15:52
52983 bytes -1 byte zopfli --i1000 --mls8 --bsr22 --lazy --ohh October 2, 2018 @ 12:41
52984 bytes -1 byte zopfli --i1000 --mls4 --bsr17 --lazy --ohh October 2, 2018 @ 12:38
52985 bytes -1 byte zopfli --i1000 --mls8 --bsr19 --lazy --ohh October 2, 2018 @ 12:33
52986 bytes zopfli --i100 --mls8 --bsr22 --lazy --ohh October 2, 2018 @ 11:00

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

Most recent activity on October 5, 2018 @ 10:41.

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, 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
52982 52982 52982 52984 52985 52984 52983 52984 52985 52984 52984 52985 52996 53013 53000
52983 52981 52980 52984 52994 52986 52981 52981 52987 52983 52987 52992 53000 53008 52991
52981 52987 52980 52982 52992 52984 52992 52980 52988 52991 52987 52990 52993 52997 52992
53018 53018 52983 52984 52982 52985 52980 52986 52988 52984 52984 52987 52990 53000 52990
52984 53022 52979 52996 52996 52997 52980 52983 52988 52994 52994 52983 52994 52996 52989
52982 53009 52981 52981 52981 52996 52979 52980 52986 53000 52991 52989 52991 52993 52995
52980 53010 52980 53019 52983 52989 52982 52987 52987 52990 53004 52982 52992 52992 52998
52983 53015 52979 52982 52981 52984 52979 52981 52988 53001 52991 52989 52999 53005 52990
52981 52981 52980 53015 52980 52990 52980 52982 52988 52991 52989 52993 52991 53002 52991
52981 52980 52980 52982 52984 52991 52979 52981 52989 52991 52990 52984 52998 52987 52993
52979 52980 52979 52983 52987 52984 52979 52984 52987 52981 53003 52989 52993 53001 52990
52979 53015 52980 52986 52981 52982 52981 52983 52987 52991 52984 52985 52990 53003 52991
52984 53011 52980 52979 52982 52992 52980 52980 52988 52991 52991 52990 52998 53007 52992
52983 52979 52983 52981 52982 52984 52980 52988 52988 53001 52991 52991 52994 52994 52999
52980 53008 52984 52982 52986 52984 52979 52987 52988 52996 53003 52989 52992 52998 52992
52981 53011 52980 52982 52981 52990 52979 52980 52987 52990 52991 52988 52997 53002 52994
52982 53009 52980 52982 52982 52983 52980 52987 52988 52992 52992 52990 52995 53002 52994
52981 53010 52983 52982 52985 52990 52980 52983 52988 53000 52992 52985 52994 53002 52995
52981 53008 52971 52981 52985 52980 52979 52982 52988 52991 53008 52989 52998 52990 52991
52981 53012 52981 52981 52984 52983 52980 52981 52987 53002 52996 52983 52990 53003 52988
52979 53008 52983 52981 52982 52984 52979 52988 52987 53000 52992 52983 52993 53001 52993
52980 53011 52984 52981 52982 52971 52981 52982 52989 53000 52991 52989 52991 53003 52993
52980 53012 52969 52983 52981 52984 52981 52982 52987 52990 52996 52982 53002 53000 52999

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 52986 bytes 100%
1,000 52983 bytes -3 bytes 100%
10,000 52977 bytes -6 bytes 100%
100,000 52970 bytes -7 bytes 0.87%
1,000,000 52969 bytes -1 byte 0.29%
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
53126 bytes +157 bytes (+0.30%) +63 bytes
53063 bytes +94 bytes (+0.18%)
53075 bytes +106 bytes (+0.20%) +12 bytes
53114 bytes +145 bytes (+0.27%) +51 bytes
53128 bytes +159 bytes (+0.30%) +65 bytes
53167 bytes +198 bytes (+0.37%) +104 bytes
53210 bytes +241 bytes (+0.45%) +147 bytes
53258 bytes +289 bytes (+0.55%) +195 bytes
53262 bytes +293 bytes (+0.55%) +199 bytes

Non-DEFLATE Algorithms

Archivers based on completely different compression algorithms often produce superior results.
Unfortunately, browsers only support gzip compression at the moment.
However, support for Brotli is constantly growing - but your browser doesn't support it.
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 38924 bytes -14045 bytes (-26.52%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46475 bytes -6494 bytes (-12.26%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47440 bytes -5529 bytes (-10.44%)
Brotli (Wikipedia) brotli brotli -q 11 48867 bytes -4102 bytes (-7.74%)
LZMA2 (Wikipedia) xz xz -9 49984 bytes -2985 bytes (-5.64%)
Zstandard (Wikipedia) zstd zstd -19 51407 bytes -1562 bytes (-2.95%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51585 bytes -1384 bytes (-2.61%)

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