Choose a version:
26% The original file has 632889 bytes (618.1k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165782 bytes (161.9k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  55868 bytes (54.6k)
local copy
gzip -9
  55815 bytes (54.5k)
local copy
libdeflate -12
  53165 bytes (51.9k)
local copy
7zip -mx=9 -tgzip
  53145 bytes (51.9k)
local copy
pigz -11 -n
  53074 bytes (51.8k)
local copy
kzip -s0 -rn -b1
  53072 bytes (51.8k)
local copy
Zopfli
  52975 bytes (51.7k)
local copy
Zopfli (defluff)
  52970 bytes (51.7k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.12.5.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.12.5 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

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 --mls8 --bsr8 --lazy --ohh

(found February 21, 2019)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 8  --mls8
block splitting recursion 8  --bsr8
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 5 more bytes (52970 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.5/dojo.js --location | md5sum
1da97fabdad5948bcab455119e7ab428  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.5.min.zopfli.js.gz | md5sum
1da97fabdad5948bcab455119e7ab428  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.5/dojo.js --location | sha1sum
a77ee64dc5b6ef19fa573a28f2c285d1b9372023  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.5.min.zopfli.js.gz | sha1sum
a77ee64dc5b6ef19fa573a28f2c285d1b9372023  -

Other Versions

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

1.15.0,
1.14.3, 1.14.2, 1.14.1, 1.14.0,
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,
1.11.7, 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,
1.6.3, 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
52975 bytes -1 byte zopfli --i100000 --mls8 --bsr8 --lazy --ohh February 21, 2019 @ 20:36
52976 bytes -1 byte zopfli --i100000 --mls8 --bsr40 --lazy --ohh February 21, 2019 @ 19:52
52977 bytes -1 byte zopfli --i100000 --mls8 --bsr10 --lazy --ohh February 21, 2019 @ 17:49
52978 bytes -6 bytes zopfli --i100000 --mls128 --bsr15 --lazy --ohh February 19, 2019 @ 23:35
52984 bytes -1 byte zopfli --i10000 --mls128 --bsr15 --lazy --ohh February 19, 2019 @ 16:32
52985 bytes -3 bytes zopfli --i10000 --mls2 --bsr25 --lazy --ohh February 19, 2019 @ 14:11
52988 bytes -1 byte zopfli --i1000 --mls128 --bsr13 --lazy --ohh February 19, 2019 @ 08:31
52989 bytes -2 bytes zopfli --i1000 --mls128 --bsr20 --lazy --ohh February 19, 2019 @ 07:41
52991 bytes zopfli --i100 --mls16 --bsr11 --lazy --ohh February 18, 2019 @ 19:15

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

Most recent activity on February 22, 2019 @ 19:54.

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
52987 52988 52988 52990 52990 52987 52988 52988 52987 52989 52990 52990 52999 53019 53007
52986 52994 52986 52989 52998 52991 52986 52986 52992 52988 52992 52994 53004 53008 52997
53027 53019 52985 52987 52997 52989 52997 52985 52993 52995 52991 52995 52996 53000 53000
53027 53023 52988 52990 52986 52987 52985 52990 52993 52988 52989 52992 52998 53012 52994
53015 53027 52975 53000 52999 52987 52988 52988 53002 52999 52999 52989 52998 53001 52994
52987 53011 52985 52986 52986 53000 52985 52986 52992 53006 52995 52998 52994 53009 53000
52986 53015 52977 53030 52989 52994 52996 52992 52992 52995 53009 52986 52997 53009 52994
53022 53013 52986 52987 52987 52989 52985 52985 52993 53006 52995 52994 52996 53010 52994
52986 52986 52985 53019 52985 52994 52985 52989 52993 52995 52995 52997 52995 53003 52995
52987 52987 52978 52989 52990 52995 52985 52980 52994 52995 52995 52990 52999 52991 52996
52985 52976 52986 52988 52991 52988 52985 52989 52992 52985 53008 52994 52996 52990 52994
53019 53012 52987 52991 52986 52990 52978 52988 52992 52996 52988 52990 52998 53011 52994
52989 53014 52986 52985 52987 52996 52986 52986 52994 52995 52995 52994 52994 53009 52995
52988 52985 52987 52986 52987 52988 52987 52993 52993 53007 52996 52995 52998 53012 52995
53019 53011 52988 52987 52989 52989 52992 52992 52993 53001 53008 52998 52996 53003 52993
53019 53014 52978 52986 52987 52994 52985 52985 52992 52995 52996 52990 52997 53002 52998
52985 53012 52977 52986 52988 52989 52986 52992 52993 52997 52997 52994 52997 53007 52999
53019 53013 52988 52986 52990 52994 52986 52989 52993 53007 52997 52990 52997 52995 52997
53021 53012 52985 52986 52991 52986 52985 52988 52993 52996 52993 52997 52996 52995 52997
52988 53015 52985 52986 52990 52985 52987 52987 52992 53005 53000 52987 52993 53007 52994
52985 53011 52988 52987 52986 52990 52985 52993 52992 53005 52996 52987 53000 53016 52999
53020 53014 52988 52986 52987 52985 52986 52987 52993 53005 52995 52994 52996 52994 52994
52986 53014 52976 52990 52987 52989 52986 52989 52992 52995 53000 52987 52999 53010 52994

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 52991 bytes 100%
1,000 52988 bytes -3 bytes 100%
10,000 52984 bytes -4 bytes 100%
100,000 52975 bytes -9 bytes 2.61%
1,000,000 52975 bytes 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
53123 bytes +148 bytes (+0.28%) +51 bytes
53072 bytes +97 bytes (+0.18%)
53073 bytes +98 bytes (+0.18%) +1 byte
53116 bytes +141 bytes (+0.27%) +44 bytes
53121 bytes +146 bytes (+0.28%) +49 bytes
53169 bytes +194 bytes (+0.37%) +97 bytes
53213 bytes +238 bytes (+0.45%) +141 bytes
53256 bytes +281 bytes (+0.53%) +184 bytes
53268 bytes +293 bytes (+0.55%) +196 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 38929 bytes -14046 bytes (-26.51%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46474 bytes -6501 bytes (-12.27%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47442 bytes -5533 bytes (-10.44%)
Brotli (Wikipedia) brotli brotli -q 11 48954 bytes -4021 bytes (-7.59%)
LZMA2 (Wikipedia) xz xz -9 49980 bytes -2995 bytes (-5.65%)
Zstandard (Wikipedia) zstd zstd -19 51309 bytes -1666 bytes (-3.14%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51539 bytes -1436 bytes (-2.71%)

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 2019.
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