Choose a version:
25% The original file has 566328 bytes (553.1k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 141104 bytes (137.8k, 25%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  48308 bytes (47.2k)
local copy
gzip -9
  48273 bytes (47.1k)
local copy
7zip -mx=9 -tgzip
  46018 bytes (44.9k)
local copy
libdeflate -12
  45961 bytes (44.9k)
local copy
kzip -s0 -rn -b1
  45930 bytes (44.9k)
local copy
pigz -11 -n
  45916 bytes (44.8k)
local copy
Zopfli
  45825 bytes (44.8k)
local copy
Zopfli (defluff)
  45823 bytes (44.7k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.7.12.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.7.12 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 --mls16384 --bsr10 --lazy --ohh

(found October 4, 2018)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 16384  --mls16384
block splitting recursion 10  --bsr10
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 2 more bytes (45823 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.7.12/dojo.js --location | md5sum
01b4cccdfe8594783f66ae75fedb5d48  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.12.min.zopfli.js.gz | md5sum
01b4cccdfe8594783f66ae75fedb5d48  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.7.12/dojo.js --location | sha1sum
511b6b9a560350121026180b203e409440a21576  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.12.min.zopfli.js.gz | sha1sum
511b6b9a560350121026180b203e409440a21576  -

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
45825 bytes -1 byte zopfli --i1000000 --mls16384 --bsr10 --lazy --ohh October 4, 2018 @ 20:50
45826 bytes -3 bytes zopfli --i100000 --mls16384 --bsr10 --lazy --ohh October 4, 2018 @ 13:16
45829 bytes -1 byte zopfli --i100000 --mls4 --bsr22 --lazy --ohh October 4, 2018 @ 12:37
45830 bytes -1 byte zopfli --i10000 --mls4 --bsr22 --lazy --ohh October 3, 2018 @ 04:50
45831 bytes -1 byte zopfli --i10000 --mls4 --bsr10 --lazy --ohh October 3, 2018 @ 04:41
45832 bytes -5 bytes zopfli --i10000 --mls512 --bsr13 --lazy --ohh October 3, 2018 @ 02:30
45837 bytes -6 bytes zopfli --i1000 --mls32 --bsr12 --lazy --ohh October 2, 2018 @ 19:04
45843 bytes -2 bytes zopfli --i1000 --mls2 --bsr22 --lazy --ohh October 2, 2018 @ 19:01
45845 bytes zopfli --i100 --mls4 --bsr22 --lazy --ohh October 2, 2018 @ 11:44

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

Most recent activity on October 4, 2018 @ 22:25.

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
45847 45842 45844 45843 45845 45842 45841 45841 45842 45858 45839 45839 45862 45854 45852
45834 45831 45835 45837 45838 45840 45846 45838 45842 45852 45845 45845 45845 45838 45841
45853 45855 45837 45832 45839 45840 45854 45840 45840 45849 45848 45841 45852 45844 45848
45832 45836 45836 45837 45846 45840 45850 45856 45840 45846 45847 45856 45859 45834 45853
45835 45838 45838 45838 45838 45856 45845 45839 45856 45848 45855 45855 45862 45841 45843
45835 45835 45848 45850 45847 45858 45846 45854 45855 45846 45860 45856 45855 45842 45832
45837 45831 45838 45835 45838 45860 45849 45848 45857 45851 45852 45847 45857 45825 45832
45833 45837 45836 45839 45836 45838 45844 45839 45837 45847 45850 45855 45861 45832 45841
45839 45835 45835 45838 45833 45856 45847 45834 45854 45846 45851 45857 45857 45833 45833
45835 45840 45838 45847 45836 45840 45849 45837 45832 45852 45859 45837 45857 45832 45833
45836 45834 45836 45833 45844 45855 45847 45856 45839 45853 45850 45839 45857 45837 45843
45838 45838 45835 45837 45848 45839 45847 45841 45854 45846 45849 45836 45858 45833 45832
45836 45835 45833 45838 45845 45847 45847 45840 45855 45846 45846 45856 45856 45832 45832
45832 45836 45834 45836 45844 45848 45846 45841 45841 45845 45861 45853 45857 45834 45832
45836 45838 45832 45832 45836 45840 45849 45840 45857 45846 45856 45841 45856 45838 45852
45836 45838 45836 45837 45839 45856 45843 45835 45856 45846 45856 45839 45861 45839 45837
45837 45836 45834 45833 45846 45840 45847 45859 45855 45846 45856 45837 45857 45838 45838
45834 45832 45836 45857 45836 45840 45853 45846 45837 45847 45849 45857 45856 45837 45837
45837 45829 45838 45839 45844 45846 45847 45849 45855 45846 45846 45844 45857 45845 45832
45841 45836 45837 45837 45845 45860 45849 45841 45837 45848 45846 45848 45860 45833 45833
45832 45837 45839 45845 45845 45852 45845 45840 45858 45854 45857 45846 45860 45838 45838
45833 45833 45834 45848 45846 45856 45847 45839 45856 45845 45850 45836 45857 45832 45834
45834 45834 45836 45836 45836 45840 45850 45840 45858 45848 45859 45837 45857 45832 45832

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 45845 bytes 100%
1,000 45837 bytes -8 bytes 100%
10,000 45830 bytes -7 bytes 100%
100,000 45826 bytes -4 bytes 0.58%
1,000,000 45825 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
45966 bytes +141 bytes (+0.31%) +36 bytes
45930 bytes +105 bytes (+0.23%)
45956 bytes +131 bytes (+0.29%) +26 bytes
45970 bytes +145 bytes (+0.32%) +40 bytes
45995 bytes +170 bytes (+0.37%) +65 bytes
46004 bytes +179 bytes (+0.39%) +74 bytes
46010 bytes +185 bytes (+0.40%) +80 bytes
46048 bytes +223 bytes (+0.49%) +118 bytes
46059 bytes +234 bytes (+0.51%) +129 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 34383 bytes -11442 bytes (-24.97%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 40556 bytes -5269 bytes (-11.50%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 41377 bytes -4448 bytes (-9.71%)
Brotli (Wikipedia) brotli brotli -q 11 42452 bytes -3373 bytes (-7.36%)
LZMA2 (Wikipedia) xz xz -9 43472 bytes -2353 bytes (-5.13%)
Zstandard (Wikipedia) zstd zstd -19 44640 bytes -1185 bytes (-2.59%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 44906 bytes -919 bytes (-2.01%)

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