Choose a version:
25% The original file has 561229 bytes (548.1k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 139643 bytes (136.4k, 25%).

After GZIP compression these minified files vary in size:
Boot
  55692 bytes (54.4k)
CDN
cdnhttps
  48606 bytes (47.5k)
CDN
cdnjs
  48463 bytes (47.3k)
CDN
gzip -6 (default)
  48294 bytes (47.2k)
local copy
gzip -9
  48256 bytes (47.1k)
local copy
7zip -mx=9 -tgzip
  46049 bytes (45.0k)
local copy
libdeflate -12
  45975 bytes (44.9k)
local copy
kzip -s0 -rn -b1
  45960 bytes (44.9k)
local copy
pigz -11 -n
  45954 bytes (44.9k)
local copy
Zopfli
  45861 bytes (44.8k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.7.5.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.7.5 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

Save 2602 bytes by using my Dojo 1.7.5 Zopfli version instead of the best available CDN (5.67% smaller than cdnjs, 45861 vs. 48463 bytes):
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 --mls16 --bsr4 --lazy --ohh

(found December 2, 2015)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 16  --mls16
block splitting recursion 4  --bsr4
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

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.7.5/dojo.js --location | md5sum
1609851dd8fad69bba9733f78357ee79  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.5.min.zopfli.js.gz | md5sum
1609851dd8fad69bba9733f78357ee79  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.7.5/dojo.js --location | sha1sum
b4022250780366777ecf625fb6cb0035f0eac6ec  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.5.min.zopfli.js.gz | sha1sum
b4022250780366777ecf625fb6cb0035f0eac6ec  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 55692 bytes 1609851dd8fad69bba9733f78357ee79 March 19, 2015 @ 15:35
cdnjs 48463 bytes 1609851dd8fad69bba9733f78357ee79 February 8, 2015 @ 14:45

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
cdnhttps 48606 bytes fc0ac5c0da40b30ba1a60f9db139593a < /*
< Copyright (c) 2004-2011, The Dojo Foundation All Rights R [...]
< Available via Academic Free License >= 2.1 OR the modifie [...]
< see: http://dojotoolkit.org/license for details
< */
<
< /*
< This is an optimized version of Dojo, built for deploymen [...]
< development. To get sources and documentation, please vis [...]
<
[...]
December 24, 2015 @ 07:33

Note: only the MD5 hashes are shown to keep things simple.

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
45861 bytes -1 byte zopfli --i100000 --mls16 --bsr4 --lazy --ohh December 2, 2015 @ 19:26
45862 bytes -1 byte zopfli --i100000 --mls16384 --bsr21 --lazy --ohh December 2, 2015 @ 17:37
45863 bytes -5 bytes zopfli --i10000 --mls8 --bsr4 --lazy --ohh October 14, 2015 @ 04:36
45868 bytes -1 byte zopfli --i1000 --mls8 --bsr4 --lazy --ohh September 19, 2015 @ 21:49
45869 bytes -1 byte zopfli --i1000 --mls16384 --bsr14 --lazy --ohh September 12, 2015 @ 20:36
45870 bytes -1 byte zopfli --i1000 --mls256 --bsr9 --lazy --ohh September 12, 2015 @ 20:24
45871 bytes -5 bytes zopfli --i1000 --mls512 --bsr16 --lazy --ohh September 10, 2015 @ 21:47
45876 bytes zopfli --i100 --mls512 --bsr16 --lazy --ohh September 10, 2015 @ 15:20

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 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
45883 45883 45880 45881 45880 45881 45880 45879 45873 45873 45872 45871 45902 45910 45881
45869 45866 45863 45861 45873 45880 45871 45879 45872 45886 45883 45880 45909 45875 45882
45881 45871 45876 45868 45880 45878 45880 45878 45879 45889 45885 45890 45900 45869 45879
45876 45873 45868 45874 45871 45878 45883 45872 45873 45893 45885 45887 45905 45876 45889
45871 45872 45873 45874 45873 45878 45891 45871 45871 45878 45883 45885 45894 45872 45879
45871 45871 45869 45870 45873 45878 45884 45868 45871 45877 45878 45879 45902 45875 45879
45870 45872 45869 45868 45870 45882 45883 45870 45873 45894 45879 45885 45895 45870 45878
45871 45872 45870 45871 45872 45879 45872 45868 45868 45877 45885 45885 45904 45874 45893
45872 45871 45871 45870 45873 45871 45880 45869 45880 45878 45889 45886 45899 45876 45879
45876 45870 45868 45874 45871 45878 45869 45873 45880 45888 45885 45882 45903 45888 45878
45868 45872 45869 45873 45863 45886 45891 45871 45880 45890 45879 45885 45899 45868 45879
45877 45873 45870 45871 45869 45878 45883 45872 45871 45878 45885 45879 45903 45878 45878
45870 45870 45868 45873 45870 45866 45880 45876 45866 45891 45887 45885 45902 45894 45879
45873 45876 45873 45871 45872 45868 45885 45871 45885 45884 45883 45885 45904 45863 45880
45872 45873 45870 45872 45870 45862 45883 45872 45883 45886 45886 45878 45903 45892 45879
45872 45874 45873 45867 45872 45880 45885 45871 45881 45878 45885 45882 45902 45873 45871
45870 45874 45868 45875 45875 45880 45883 45871 45883 45891 45878 45885 45899 45870 45877
45870 45872 45870 45868 45874 45880 45884 45878 45882 45878 45879 45878 45903 45862 45888
45871 45872 45869 45869 45868 45881 45882 45873 45881 45876 45891 45886 45899 45873 45878
45870 45870 45870 45873 45874 45880 45879 45871 45882 45878 45888 45885 45900 45878 45891
45869 45872 45872 45868 45866 45881 45884 45876 45883 45880 45876 45895 45901 45872 45881
45872 45871 45868 45870 45871 45880 45872 45871 45881 45887 45888 45885 45901 45869 45900
45871 45872 45876 45874 45872 45880 45883 45872 45883 45888 45882 45883 45900 45866 45882

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 45870 bytes 100%
1,000 45868 bytes -2 bytes 100%
10,000 45863 bytes -5 bytes 100%
100,000 45861 bytes -2 bytes 1.74%
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
45987 bytes +126 bytes (+0.27%) +27 bytes
45960 bytes +99 bytes (+0.22%)
45988 bytes +127 bytes (+0.28%) +28 bytes
46027 bytes +166 bytes (+0.36%) +67 bytes
46044 bytes +183 bytes (+0.40%) +84 bytes
46033 bytes +172 bytes (+0.38%) +73 bytes
46063 bytes +202 bytes (+0.44%) +103 bytes
46087 bytes +226 bytes (+0.49%) +127 bytes
46107 bytes +246 bytes (+0.54%) +147 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 34317 bytes -11544 bytes (-25.17%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 40231 bytes -5630 bytes (-12.28%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 40982 bytes -4879 bytes (-10.64%)
Brotli (Wikipedia) brotli brotli -q 11 42202 bytes -3659 bytes (-7.98%)
LZMA2 (Wikipedia) xz xz -9 43256 bytes -2605 bytes (-5.68%)
Zstandard (Wikipedia) zstd zstd -19 44552 bytes -1309 bytes (-2.85%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 44575 bytes -1286 bytes (-2.80%)

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