Choose a version:
24% The original file has 375162 bytes (366.4k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 89537 bytes (87.4k, 24%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  30487 bytes (29.8k)
local copy
gzip -9
  30449 bytes (29.7k)
local copy
libdeflate -12
  29118 bytes (28.4k)
local copy
7zip -mx=9 -tgzip
  29078 bytes (28.4k)
local copy
kzip -s0 -rn -b0
  29077 bytes (28.4k)
local copy
zultra
  29031 bytes (28.4k)
local copy
pigz -11 -n
  29001 bytes (28.3k)
local copy
Zopfli
  28926 bytes (28.2k)
local copy
Zopfli (defluff)
  28925 bytes (28.2k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.4.8.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.4.8 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 --mls64 --bsr21 --lazy --ohh

(found February 28, 2020)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 64  --mls64
block splitting recursion 21  --bsr21
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 (28925 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.4.8/dojo.js --location | md5sum
c936db8b4c4e9106578b218dd3dca34b  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.4.8.min.zopfli.js.gz | md5sum
c936db8b4c4e9106578b218dd3dca34b  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.4.8/dojo.js --location | sha1sum
dc2647112049d6468f67837f285efaebbef50f7f  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.4.8.min.zopfli.js.gz | sha1sum
dc2647112049d6468f67837f285efaebbef50f7f  -

Other Versions

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

1.16.3, 1.16.2, 1.16.1, 1.16.0,
1.15.4, 1.15.3, 1.15.2, 1.15.1, 1.15.0,
1.14.7, 1.14.6, 1.14.5, 1.14.4, 1.14.3, 1.14.2, 1.14.1, 1.14.0,
1.13.5, 1.13.4, 1.13.3, 1.13.2, 1.13.1, 1.13.0,
1.12.5, 1.12.4, 1.12.3, 1.12.2, 1.12.1,
1.11.8, 1.11.7, 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,
1.6.5, 1.6.4, 1.6.3, 1.6.2, 1.6.1, 1.6.0,
1.5.6, 1.5.5, 1.5.4, 1.5.3, 1.5.2, 1.5.1, 1.5.0,
1.4.8, 1.4.7, 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, 1.2.2

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
28926 bytes -1 byte zopfli --i1000000 --mls64 --bsr21 --lazy --ohh February 28, 2020 @ 19:23
28927 bytes -2 bytes zopfli --i100000 --mls64 --bsr21 --lazy --ohh January 28, 2020 @ 18:19
28929 bytes -7 bytes zopfli --i10000 --mls64 --bsr21 --lazy --ohh January 28, 2020 @ 17:41
28936 bytes -3 bytes zopfli --i1000 --mls64 --bsr21 --lazy --ohh January 28, 2020 @ 16:33
28939 bytes zopfli --i100 --mls64 --bsr21 --lazy --ohh January 28, 2020 @ 13:24

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

Most recent activity on July 20, 2020 @ 12:53.

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
28995 29008 29007 29001 28998 29006 29008 29016 29011 29019 29009 29011 29024 29014 29013
28978 29005 29007 28984 28984 28984 28984 28994 28993 28995 28965 29013 29013 29019 29008
28987 28988 28982 28977 28974 28996 28985 28982 28993 28995 28990 29020 28985 29014 29017
28971 28981 28982 28990 28981 28987 28972 28973 28991 28993 28989 29020 29019 29018 29015
28978 28982 28982 28980 28975 28982 28974 28972 28967 28977 28979 29012 29012 29014 29015
29002 28974 28987 28981 28971 28981 28973 28972 29005 28984 28985 29009 29009 29006 29009
28989 28976 28956 28986 28988 28986 28973 28973 28997 28989 28981 29010 28987 29013 29008
28978 28971 28973 28972 28967 28972 28975 28971 28976 28974 28972 29014 28984 29017 29010
28978 28990 28969 28974 28972 28967 28973 28984 28977 28988 28979 29011 29019 29015 29015
28974 28971 28979 28975 28982 28972 28970 28972 28978 28979 28992 28962 29020 29015 29007
28977 28979 28968 28965 28973 28985 28964 28991 28982 29013 28985 29011 28995 29015 29015
28972 28966 28970 28972 28975 28966 28975 28975 28978 28980 28982 29009 29020 29015 29015
28978 28971 28950 28986 28986 28969 28972 28972 28978 29001 28983 29008 28990 29015 29015
28972 28977 28979 28981 28988 28973 28975 28979 28985 28989 28974 29010 29012 29015 29015
28982 28979 28959 28987 28979 28984 28953 28964 28980 29002 28988 29012 28984 29017 29017
28988 28983 28980 28985 28976 28970 29009 28966 28983 28995 28984 29008 28970 29007 29007
28954 28952 28960 28957 28977 28970 28984 28977 28966 29009 28990 29008 28990 29011 29015
28970 28985 28977 28983 28965 28926 28972 28966 28980 28983 28990 29011 28985 29006 29006
28955 28957 28981 28979 28969 28969 28979 28979 28984 28986 28989 29019 28969 29016 29007
28982 28967 28974 28972 28983 28974 28968 28967 28971 28983 28979 29017 29009 29011 29007
28972 28970 28967 28977 28970 28967 28972 28976 28986 28985 28979 29011 29019 29015 29015
28969 28976 28978 28969 28973 28944 28974 28973 28976 28979 28974 29018 29009 29008 29007
28974 28978 28980 28973 28977 28965 28976 28966 28984 28977 28980 29010 29011 29015 29015

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 28939 bytes 100%
1,000 28936 bytes -3 bytes 100%
10,000 28929 bytes -7 bytes 100%
100,000 28927 bytes -2 bytes 0.58%
1,000,000 28926 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
29077 bytes +151 bytes (+0.52%)
29081 bytes +155 bytes (+0.54%) +4 bytes
29107 bytes +181 bytes (+0.63%) +30 bytes
29077 bytes +151 bytes (+0.52%)
29100 bytes +174 bytes (+0.60%) +23 bytes
29091 bytes +165 bytes (+0.57%) +14 bytes
29082 bytes +156 bytes (+0.54%) +5 bytes
29093 bytes +167 bytes (+0.58%) +16 bytes
29136 bytes +210 bytes (+0.73%) +59 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 - for example, your browser actually supports it !
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 23026 bytes -5900 bytes (-20.40%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 25801 bytes -3125 bytes (-10.80%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 26699 bytes -2227 bytes (-7.70%)
Brotli (Wikipedia) brotli brotli -q 11 26888 bytes -2038 bytes (-7.05%)
LZMA2 (Wikipedia) xz xz -9 27752 bytes -1174 bytes (-4.06%)
Zstandard (Wikipedia) zstd zstd -19 28384 bytes -542 bytes (-1.87%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 28638 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 2020.
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

All trademarks are property of their respective owners. You know, the boring legal stuff.