Choose a version:
26% The original file has 627075 bytes (612.4k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 162956 bytes (159.1k, 26%).

After GZIP compression these minified files vary in size:
Boot
  64548 bytes (63.0k)
CDN
cdnhttps
  56122 bytes (54.8k)
CDN
cdnjs
  56007 bytes (54.7k)
CDN
gzip -6 (default)
  55748 bytes (54.4k)
local copy
gzip -9
  55687 bytes (54.4k)
local copy
7zip -mx=9 -tgzip
  53035 bytes (51.8k)
local copy
libdeflate -12
  53022 bytes (51.8k)
local copy
pigz -11 -n
  52986 bytes (51.7k)
local copy
kzip -s0 -rn -b1
  52984 bytes (51.7k)
local copy
Zopfli
  52800 bytes (51.6k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.10.0.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.10.0 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 3207 bytes by using my Dojo 1.10.0 Zopfli version instead of the best available CDN (6.07% smaller than cdnjs, 52800 vs. 56007 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 --mls2 --bsr12 --lazy --ohh

(found September 28, 2015)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 2  --mls2
block splitting recursion 12  --bsr12
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-1.10.0/dojo.js --location | md5sum
d2f939d4b2ed07cfe6fc8c73855c30d0  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.10.0.min.zopfli.js.gz | md5sum
d2f939d4b2ed07cfe6fc8c73855c30d0  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.10.0/dojo.js --location | sha1sum
ce2f1541bf5b225dc1208c1c81de7ffca83f67a5  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.10.0.min.zopfli.js.gz | sha1sum
ce2f1541bf5b225dc1208c1c81de7ffca83f67a5  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 64548 bytes d2f939d4b2ed07cfe6fc8c73855c30d0 March 19, 2015 @ 15:27
cdnjs 56007 bytes d2f939d4b2ed07cfe6fc8c73855c30d0 February 8, 2015 @ 14:45

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
cdnhttps 56122 bytes 2761dfcaf9ddc5004751002dce245b6c < /*
< 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
52800 bytes -2 bytes zopfli --i100000 --mls2 --bsr12 --lazy --ohh September 28, 2015 @ 06:26
52802 bytes -1 byte zopfli --i10000 --mls2 --bsr16 --lazy --ohh September 26, 2015 @ 22:08
52803 bytes -4 bytes zopfli --i10000 --mls2 --bsr12 --lazy --ohh September 26, 2015 @ 20:25
52807 bytes -1 byte zopfli --i1000 --mls2 --bsr12 --lazy --ohh September 22, 2015 @ 16:13
52808 bytes -7 bytes zopfli --i1000 --mls8 --bsr16 --lazy --ohh September 18, 2015 @ 21:00
52815 bytes -2 bytes zopfli --i1000 --mls8 --bsr6 --lazy --ohh September 18, 2015 @ 19:24
52817 bytes zopfli --i100 --mls8 --bsr16 --lazy --ohh September 18, 2015 @ 16:18

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 @ 14:37.

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
52842 52879 52877 52879 52877 52878 52880 52887 52888 52884 52896 52899 52894 52915 52890
52822 52820 52824 52824 52877 52880 52878 52878 52883 52884 52889 52887 52881 52890 52891
52878 52823 52809 52878 52879 52886 52881 52884 52877 52880 52890 52882 52890 52902 52891
52896 52879 52879 52914 52877 52888 52882 52884 52885 52888 52892 52885 52882 52909 52887
52801 52815 52815 52813 52881 52877 52882 52882 52881 52889 52897 52891 52890 52893 52884
52800 52826 52832 52822 52876 52879 52881 52886 52876 52879 52890 52880 52889 52902 52882
52828 52869 52814 52878 52877 52877 52884 52877 52882 52882 52886 52882 52882 52884 52882
52813 52816 52806 52813 52877 52877 52882 52882 52878 52880 52888 52898 52890 52888 52883
52800 52816 52818 52813 52880 52882 52882 52877 52877 52882 52888 52893 52889 52888 52891
52814 52800 52816 52813 52876 52882 52878 52888 52882 52880 52894 52882 52881 52892 52884
52801 52814 52815 52908 52880 52877 52887 52882 52887 52885 52876 52884 52881 52894 52881
52816 52814 52819 52818 52879 52877 52883 52880 52883 52888 52886 52881 52882 52899 52888
52800 52812 52800 52818 52877 52879 52883 52882 52882 52881 52891 52882 52889 52891 52898
52819 52815 52815 52818 52876 52877 52882 52879 52881 52887 52892 52888 52891 52889 52897
52818 52813 52815 52814 52878 52879 52884 52879 52881 52888 52890 52887 52889 52894 52891
52802 52813 52817 52820 52880 52877 52882 52877 52877 52889 52892 52883 52888 52889 52881
52806 52809 52881 52813 52878 52877 52882 52880 52881 52882 52890 52882 52882 52889 52891
52814 52800 52816 52820 52878 52876 52883 52897 52881 52878 52891 52881 52882 52905 52891
52816 52814 52817 52817 52879 52878 52883 52888 52880 52883 52891 52889 52888 52902 52884
52866 52870 52814 52880 52876 52876 52877 52883 52883 52889 52890 52889 52889 52897 52882
52870 52879 52800 52879 52875 52876 52882 52882 52877 52889 52888 52884 52881 52890 52882
52807 52814 52814 52818 52878 52877 52882 52882 52881 52889 52892 52884 52889 52888 52892
52816 52812 52817 52815 52876 52877 52887 52880 52881 52889 52892 52880 52882 52893 52881

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 52816 bytes 100%
1,000 52807 bytes -9 bytes 100%
10,000 52802 bytes -5 bytes 100%
100,000 52800 bytes -2 bytes 2.90%
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
53055 bytes +255 bytes (+0.48%) +71 bytes
52984 bytes +184 bytes (+0.35%)
53001 bytes +201 bytes (+0.38%) +17 bytes
53044 bytes +244 bytes (+0.46%) +60 bytes
53085 bytes +285 bytes (+0.54%) +101 bytes
53111 bytes +311 bytes (+0.59%) +127 bytes
53123 bytes +323 bytes (+0.61%) +139 bytes
53149 bytes +349 bytes (+0.66%) +165 bytes
53188 bytes +388 bytes (+0.73%) +204 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 38758 bytes -14042 bytes (-26.59%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 45917 bytes -6883 bytes (-13.04%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47325 bytes -5475 bytes (-10.37%)
Brotli (Wikipedia) brotli brotli -q 11 48426 bytes -4374 bytes (-8.28%)
LZMA2 (Wikipedia) xz xz -9 49576 bytes -3224 bytes (-6.11%)
Zstandard (Wikipedia) zstd zstd -19 51060 bytes -1740 bytes (-3.30%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51074 bytes -1726 bytes (-3.27%)

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