Choose a version:
24% The original file has 375088 bytes (366.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 89269 bytes (87.2k, 24%).

After GZIP compression these minified files vary in size:
Boot
  35018 bytes (34.2k)
CDN
cdnhttps
  30550 bytes (29.8k)
CDN
Baidu
  30531 bytes (29.8k)
CDN
cdnjs
  30522 bytes (29.8k)
CDN
gzip -6 (default)
  30422 bytes (29.7k)
local copy
gzip -9
  30385 bytes (29.7k)
local copy
libdeflate -12
  29065 bytes (28.4k)
local copy
7zip -mx=9 -tgzip
  29024 bytes (28.3k)
local copy
kzip -s0 -rn -b0
  29007 bytes (28.3k)
local copy
pigz -11 -n
  28954 bytes (28.3k)
local copy
Zopfli
  28871 bytes (28.2k)
local copy
Zopfli (defluff)
  28869 bytes (28.2k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.4.3.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.4.3 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 1651 bytes by using my Dojo 1.4.3 Zopfli version instead of the best available CDN (5.72% smaller than cdnjs, 28871 vs. 30522 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 --mls64 --bsr30 --lazy --ohh

(found December 1, 2015)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 64  --mls64
block splitting recursion 30  --bsr30
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 (28869 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.4.3/dojo.js --location | md5sum
ab083c0ee8fd32de6a272b2b38cd567b  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.4.3.min.zopfli.js.gz | md5sum
ab083c0ee8fd32de6a272b2b38cd567b  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.4.3/dojo.js --location | sha1sum
2c11746af7d894ed4b92d3fa69d6432eaad20343  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.4.3.min.zopfli.js.gz | sha1sum
2c11746af7d894ed4b92d3fa69d6432eaad20343  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 35018 bytes ab083c0ee8fd32de6a272b2b38cd567b March 19, 2015 @ 15:31
cdnjs 30522 bytes ab083c0ee8fd32de6a272b2b38cd567b February 8, 2015 @ 14:45

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
cdnhttps 30550 bytes 70d61cf2fa74e65f04b1c8916024f6f4 < /*
< Copyright (c) 2004-2009, 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 a compiled version of Dojo, built for deployment [...]
< development. To get an editable version, please visit:
<
[...]
December 24, 2015 @ 07:33
Baidu 30531 bytes f4479e3a85a03a6d0179667b64e801d9 only whitespaces differ January 7, 2015 @ 10:16

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
28871 bytes -4 bytes zopfli --i100000 --mls64 --bsr30 --lazy --ohh December 1, 2015 @ 16:42
28875 bytes -4 bytes zopfli --i10000 --mls64 --bsr30 --lazy --ohh September 24, 2015 @ 11:53
28879 bytes -8 bytes zopfli --i1000 --mls64 --bsr30 --lazy --ohh September 24, 2015 @ 11:50
28887 bytes zopfli --i100 --mls64 --bsr30 --lazy --ohh September 24, 2015 @ 11:42

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 @ 14:39.

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
28943 28939 28952 28949 28944 28968 28958 28953 28960 28961 28961 28955 28970 28956 28958
28925 28951 28941 28949 28923 28914 28915 28931 28930 28952 28925 28960 28957 28960 28964
28922 28924 28917 28923 28928 28917 28931 28945 28940 28959 28935 28961 28904 28959 28956
28924 28929 28934 28932 28945 28925 28918 28919 28938 28949 28936 28962 28957 28959 28957
28921 28917 28918 28928 28923 28929 28929 28932 28924 28927 28927 28951 28958 28958 28960
28934 28925 28920 28920 28917 28921 28914 28911 28943 28961 28928 28952 28942 28952 28953
28927 28924 28923 28925 28921 28918 28918 28919 28939 28954 28939 28951 28923 28961 28950
28927 28918 28914 28909 28939 28908 28918 28919 28923 28953 28931 28952 28957 28959 28960
28921 28917 28919 28927 28919 28912 28910 28919 28928 28910 28915 28897 28958 28954 28961
28916 28912 28918 28918 28909 28916 28920 28924 28926 28913 28912 28895 28903 28952 28952
28908 28911 28906 28913 28910 28910 28916 28923 28925 28954 28914 28954 28902 28958 28958
28904 28916 28933 28914 28910 28910 28920 28924 28921 28917 28907 28960 28959 28961 28964
28911 28917 28907 28913 28922 28908 28919 28909 28926 28917 28930 28951 28943 28958 28958
28912 28928 28904 28931 28926 28917 28918 28919 28922 28916 28919 28926 28959 28959 28958
28916 28901 28898 28921 28911 28918 28921 28913 28921 28924 28919 28951 28904 28966 28958
28919 28917 28932 28919 28911 28920 28914 28932 28919 28923 28950 28957 28959 28952 28952
28897 28898 28892 28909 28901 28928 28920 28931 28912 28914 28928 28954 28959 28961 28953
28918 28925 28930 28922 28926 28902 28951 28911 28930 28917 28935 28955 28940 28959 28950
28897 28897 28931 28912 28920 28922 28931 28931 28929 28950 28933 28960 28944 28957 28958
28927 28911 28911 28908 28910 28915 28921 28912 28915 28912 28934 28960 28947 28954 28951
28908 28911 28935 28913 28934 28910 28918 28921 28921 28913 28914 28919 28902 28959 28958
28928 28919 28912 28908 28910 28871 28916 28935 28927 28917 28913 28952 28898 28952 28952
28911 28908 28916 28915 28916 28915 28919 28923 28929 28913 28906 28954 28968 28953 28952

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 28887 bytes 100%
1,000 28879 bytes -8 bytes 100%
10,000 28875 bytes -4 bytes 100%
100,000 28871 bytes -4 bytes 0.29%
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
29007 bytes +136 bytes (+0.47%)
29007 bytes +136 bytes (+0.47%)
29050 bytes +179 bytes (+0.62%) +43 bytes
29021 bytes +150 bytes (+0.52%) +14 bytes
29043 bytes +172 bytes (+0.60%) +36 bytes
29033 bytes +162 bytes (+0.56%) +26 bytes
29022 bytes +151 bytes (+0.52%) +15 bytes
29030 bytes +159 bytes (+0.55%) +23 bytes
29075 bytes +204 bytes (+0.71%) +68 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 22987 bytes -5884 bytes (-20.38%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 25768 bytes -3103 bytes (-10.75%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 26626 bytes -2245 bytes (-7.78%)
Brotli (Wikipedia) brotli brotli -q 11 26822 bytes -2049 bytes (-7.10%)
LZMA2 (Wikipedia) xz xz -9 27712 bytes -1159 bytes (-4.01%)
Zstandard (Wikipedia) zstd zstd -19 28471 bytes -400 bytes (-1.39%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 28583 bytes -288 bytes (-1.00%)

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