Choose a version:
26% The original file has 632881 bytes (618.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165774 bytes (161.9k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  55866 bytes (54.6k)
local copy
gzip -9
  55813 bytes (54.5k)
local copy
libdeflate -12
  53164 bytes (51.9k)
local copy
7zip -mx=9 -tgzip
  53143 bytes (51.9k)
local copy
zultra
  53074 bytes (51.8k)
local copy
kzip -s0 -rn -b1
  53072 bytes (51.8k)
local copy
pigz -11 -n
  53072 bytes (51.8k)
local copy
Zopfli
  52973 bytes (51.7k)
local copy
Zopfli (defluff)
  52972 bytes (51.7k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.12.6.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.12.6 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 --mls128 --bsr19 --lazy --ohh

(found March 11, 2022)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 128  --mls128
block splitting recursion 19  --bsr19
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 (52972 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.6/dojo.js --location | md5sum
bbfa5280b77261c7072a16796ccf573d  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.6.min.zopfli.js.gz | md5sum
bbfa5280b77261c7072a16796ccf573d  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.6/dojo.js --location | sha1sum
ae2a2078a7255631dffadf236f548f768f2310ad  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.6.min.zopfli.js.gz | sha1sum
ae2a2078a7255631dffadf236f548f768f2310ad  -

Other Versions

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

1.17.2, 1.17.1, 1.17.0,
1.16.5, 1.16.4, 1.16.3, 1.16.2, 1.16.1, 1.16.0,
1.15.6, 1.15.5, 1.15.4, 1.15.3, 1.15.2, 1.15.1, 1.15.0,
1.14.9, 1.14.8, 1.14.7, 1.14.6, 1.14.5, 1.14.4, 1.14.3, 1.14.2, 1.14.1, 1.14.0,
1.13.10, 1.13.9, 1.13.8, 1.13.7, 1.13.6, 1.13.5, 1.13.4, 1.13.3, 1.13.2, 1.13.1, 1.13.0,
1.12.11, 1.12.10, 1.12.9, 1.12.8, 1.12.7, 1.12.6, 1.12.5, 1.12.4, 1.12.3, 1.12.2, 1.12.1,
1.11.13, 1.11.12, 1.11.11, 1.11.10, 1.11.9, 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
52973 bytes -1 byte zopfli --i1000000 --mls128 --bsr19 --lazy --ohh March 11, 2022 @ 02:01
52974 bytes -1 byte zopfli --i1000000 --mls128 --bsr9 --lazy --ohh March 10, 2022 @ 05:33
52975 bytes -7 bytes zopfli --i100000 --mls128 --bsr19 --lazy --ohh March 4, 2022 @ 14:38
52982 bytes -4 bytes zopfli --i10000 --mls128 --bsr19 --lazy --ohh February 26, 2022 @ 04:25
52986 bytes -1 byte zopfli --i10000 --mls256 --bsr12 --lazy --ohh February 25, 2022 @ 15:37
52987 bytes -1 byte zopfli --i10000 --mls16 --bsr12 --lazy --ohh February 25, 2022 @ 07:51
52988 bytes -1 byte zopfli --i1000 --mls8 --bsr22 --lazy --ohh February 24, 2022 @ 19:25
52989 bytes -2 bytes zopfli --i1000 --mls128 --bsr23 --lazy --ohh February 24, 2022 @ 17:17
52991 bytes zopfli --i100 --mls4 --bsr17 --lazy --ohh February 24, 2022 @ 15:20

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

Most recent activity on March 11, 2022 @ 09:50.

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
52985 52987 52986 52987 52989 52987 52988 52988 52999 52990 52987 52989 52998 53013 53003
52986 52986 52984 52986 52997 52992 52984 52985 52991 52987 52992 52994 53002 53007 52996
53028 52985 52985 52986 52995 52988 52994 52984 52992 52996 52992 52995 52996 52999 52997
52987 53020 52988 52987 52988 52990 52983 52990 52992 52988 52988 52991 52989 53011 52993
53018 53026 52984 52987 52985 52987 52985 52987 52992 52998 52998 52988 52996 52994 52995
52989 53010 52988 52984 52986 52999 52974 52984 52991 53006 52995 52993 52992 53007 52996
52984 53014 52987 53028 52988 52984 52992 52991 52991 52995 53008 52989 52997 53008 52993
53025 53008 52986 52986 52988 52988 52984 52985 52992 53006 52995 52993 52999 53009 52994
52987 52987 52987 52987 52984 52990 52985 52986 52991 52995 52994 52996 52994 53004 52993
52988 53028 52987 52988 52990 52992 52974 52986 52993 52995 52994 52987 52998 52990 52995
52983 53014 52986 52990 52990 52987 52976 52989 52991 52986 53007 52993 52996 52989 52992
52983 53017 52986 52989 52985 52988 52986 52987 52991 52996 52989 52988 52993 53010 52993
52990 53013 52984 52984 52986 52996 52984 52985 52993 52995 52995 52994 52992 53008 52994
52987 52974 52990 52985 52986 52987 52986 52991 52992 53006 52996 52995 52998 52998 52994
52985 53011 52987 52986 52991 52987 52991 52991 52991 53001 53008 52993 52995 53003 52992
52987 53014 52984 52985 52988 52991 52973 52984 52991 52995 52996 52993 52994 53002 52997
52987 53022 52987 52985 52987 52987 52984 52991 52991 52997 52996 52994 52994 53005 52996
52987 53012 52987 52985 52989 52989 52985 52988 52992 53006 52996 52988 52996 52995 52997
52987 53011 52974 52985 52990 52986 52975 52986 52992 52996 53013 52993 52995 52994 52993
52986 53015 52985 52988 52989 52987 52986 52986 52991 53009 53000 52987 52992 53006 52993
52983 53011 52987 52985 52988 52988 52984 52991 52991 53006 52997 52987 52991 53015 52998
52984 53012 52986 52988 52986 52984 52984 52986 52993 53005 52994 52994 52994 52992 52993
52985 53014 52983 52989 52986 52984 52985 52988 52991 52995 53000 52989 52996 53008 52993

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 52982 bytes -6 bytes 100%
100,000 52975 bytes -7 bytes 2.90%
1,000,000 52973 bytes -2 bytes 1.74%
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
53133 bytes +160 bytes (+0.30%) +61 bytes
53072 bytes +99 bytes (+0.19%)
53083 bytes +110 bytes (+0.21%) +11 bytes
53123 bytes +150 bytes (+0.28%) +51 bytes
53141 bytes +168 bytes (+0.32%) +69 bytes
53167 bytes +194 bytes (+0.37%) +95 bytes
53197 bytes +224 bytes (+0.42%) +125 bytes
53265 bytes +292 bytes (+0.55%) +193 bytes
53269 bytes +296 bytes (+0.56%) +197 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 38932 bytes -14041 bytes (-26.51%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46471 bytes -6502 bytes (-12.27%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47441 bytes -5532 bytes (-10.44%)
Brotli (Wikipedia) brotli brotli -q 11 48918 bytes -4055 bytes (-7.65%)
LZMA2 (Wikipedia) xz xz -9 49976 bytes -2997 bytes (-5.66%)
Zstandard (Wikipedia) zstd zstd -19 51309 bytes -1664 bytes (-3.14%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51547 bytes -1426 bytes (-2.69%)

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 2022.
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.