Choose a version:
26% The original file has 632905 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 165794 bytes (161.9k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  55872 bytes (54.6k)
local copy
gzip -9
  55819 bytes (54.5k)
local copy
libdeflate -12
  53176 bytes (51.9k)
local copy
7zip -mx=9 -tgzip
  53152 bytes (51.9k)
local copy
pigz -11 -n
  53089 bytes (51.8k)
local copy
zultra
  53084 bytes (51.8k)
local copy
kzip -s0 -rn -b1
  53078 bytes (51.8k)
local copy
Zopfli
  52983 bytes (51.7k)
local copy
Zopfli (defluff)
  52978 bytes (51.7k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.12.8.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.12.8 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 --bsr30 --lazy --ohh

(found March 9, 2022)
Description Value Parameter
iterations 1000000  --i1000000
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 5 more bytes (52978 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.8/dojo.js --location | md5sum
358cabd04173ce27b4d2a65add494602  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.8.min.zopfli.js.gz | md5sum
358cabd04173ce27b4d2a65add494602  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.8/dojo.js --location | sha1sum
a8b0f2e830a3af36a29c62116458a7559c0ae93f  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.8.min.zopfli.js.gz | sha1sum
a8b0f2e830a3af36a29c62116458a7559c0ae93f  -

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
52983 bytes -1 byte zopfli --i1000000 --mls64 --bsr30 --lazy --ohh March 9, 2022 @ 18:24
52984 bytes -1 byte zopfli --i100000 --mls64 --bsr30 --lazy --ohh March 4, 2022 @ 18:27
52985 bytes -6 bytes zopfli --i100000 --mls128 --bsr9 --lazy --ohh March 4, 2022 @ 11:13
52991 bytes -2 bytes zopfli --i10000 --mls128 --bsr9 --lazy --ohh February 26, 2022 @ 03:17
52993 bytes -4 bytes zopfli --i10000 --mls8 --bsr11 --lazy --ohh February 25, 2022 @ 07:33
52997 bytes -1 byte zopfli --i1000 --mls4 --bsr40 --lazy --ohh February 24, 2022 @ 18:13
52998 bytes -1 byte zopfli --i1000 --mls4 --bsr16 --lazy --ohh February 24, 2022 @ 17:49
52999 bytes -1 byte zopfli --i1000 --mls8 --bsr13 --lazy --ohh February 24, 2022 @ 17:16
53000 bytes zopfli --i100 --mls4 --bsr18 --lazy --ohh February 24, 2022 @ 15:33

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

Most recent activity on March 9, 2022 @ 21:30.

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
52995 52996 52996 52998 52998 52996 52998 52997 52997 52998 52996 52999 53008 53021 53013
52995 52994 52996 52998 53007 52999 52993 52994 53003 52997 53001 52999 53011 53017 53006
53030 52995 52994 52996 53005 52997 53004 52993 53001 53005 53001 53005 53007 53016 53007
53032 53039 52995 52996 52995 52993 52994 53001 53003 52999 52998 53001 53007 53020 53007
53024 53035 52985 52996 53007 53008 52994 52996 53012 53008 53008 52994 53006 53006 53004
52996 52992 52994 52994 52995 53009 52985 52994 53000 53015 53001 53008 53004 53017 53005
52994 52996 52993 53038 53006 53003 53004 53001 53003 53005 53018 52996 53007 53006 53002
52997 52985 52993 52995 52995 52995 52992 52994 53001 53016 53017 53004 53005 53018 53002
52995 52992 52994 52996 52994 53003 52985 52996 53001 53005 53007 53006 53002 53006 53006
52995 52992 52994 52997 52998 53005 52991 52993 53003 53005 53008 52997 53005 53004 53005
52993 52993 52994 52997 52999 52997 52985 52998 53003 52995 53017 53006 53007 53007 53003
53027 52992 52993 53000 52995 52998 52993 52996 53003 53006 52999 52998 53008 53020 53003
52997 52985 52992 52995 52995 53006 52993 52992 53002 53006 53001 53000 53004 53005 53005
52997 52985 52997 52997 52996 52997 52994 53001 53001 53016 53006 53004 53006 53004 53005
52996 52985 52997 52995 52998 52998 53003 53003 53001 53013 53017 53005 53003 53012 53002
53028 52992 52994 52995 52995 53004 52992 52994 53000 53005 53002 53004 53008 53011 53007
52995 52992 52993 52995 52996 52997 52985 53001 53001 53007 53017 53004 53009 53000 53007
53027 52992 52994 52996 52998 53004 52995 52996 53001 53016 53020 52998 53005 53005 53006
53032 52992 52985 52994 52999 52993 52985 52996 53001 53006 53002 52996 53004 53004 53007
52996 52994 52995 52995 52998 52985 52992 52995 53002 53006 53001 52996 53005 53006 53003
52994 52992 52997 52995 52995 52997 52992 53001 53001 53018 53002 53006 53007 53025 53007
52994 52994 52997 52995 52995 52983 52993 52995 53002 53015 53005 52996 53004 53003 53003
52994 52985 52993 52994 52996 52989 52993 52995 53001 53005 53003 52996 53008 53003 53005

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 53000 bytes 100%
1,000 52997 bytes -3 bytes 100%
10,000 52991 bytes -6 bytes 100%
100,000 52984 bytes -7 bytes 4.64%
1,000,000 52983 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
53135 bytes +152 bytes (+0.29%) +57 bytes
53078 bytes +95 bytes (+0.18%)
53083 bytes +100 bytes (+0.19%) +5 bytes
53112 bytes +129 bytes (+0.24%) +34 bytes
53140 bytes +157 bytes (+0.30%) +62 bytes
53183 bytes +200 bytes (+0.38%) +105 bytes
53228 bytes +245 bytes (+0.46%) +150 bytes
53265 bytes +282 bytes (+0.53%) +187 bytes
53282 bytes +299 bytes (+0.56%) +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 - for example, your browser actually supports it !
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 38939 bytes -14044 bytes (-26.51%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46487 bytes -6496 bytes (-12.26%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47453 bytes -5530 bytes (-10.44%)
Brotli (Wikipedia) brotli brotli -q 11 48915 bytes -4068 bytes (-7.68%)
LZMA2 (Wikipedia) xz xz -9 49984 bytes -2999 bytes (-5.66%)
Zstandard (Wikipedia) zstd zstd -19 51325 bytes -1658 bytes (-3.13%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51547 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 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.