Choose a version:
26% The original file has 637149 bytes (622.2k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167196 bytes (163.3k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  56214 bytes (54.9k)
local copy
gzip -9
  56152 bytes (54.8k)
local copy
libdeflate -12
  53462 bytes (52.2k)
local copy
7zip -mx=9 -tgzip
  53433 bytes (52.2k)
local copy
kzip -s0 -rn -b1
  53379 bytes (52.1k)
local copy
pigz -11 -n
  53360 bytes (52.1k)
local copy
Zopfli
  53288 bytes (52.0k)
local copy
Zopfli (defluff)
  53284 bytes (52.0k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.13.5.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.13.5 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 --bsr7 --lazy --ohh

(found January 28, 2020)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 8  --mls8
block splitting recursion 7  --bsr7
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 4 more bytes (53284 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.5/dojo.js --location | md5sum
ff90e0532733e9412177893fcdbac474  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.5.min.zopfli.js.gz | md5sum
ff90e0532733e9412177893fcdbac474  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.5/dojo.js --location | sha1sum
b8298dfa93bce44a05b49951dc6bd907fd39d251  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.5.min.zopfli.js.gz | sha1sum
b8298dfa93bce44a05b49951dc6bd907fd39d251  -

Other Versions

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

1.16.2, 1.16.1, 1.16.0,
1.15.3, 1.15.2, 1.15.1, 1.15.0,
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
53288 bytes -8 bytes zopfli --i100000 --mls8 --bsr7 --lazy --ohh January 28, 2020 @ 19:09
53296 bytes -7 bytes zopfli --i10000 --mls8 --bsr7 --lazy --ohh January 28, 2020 @ 17:54
53303 bytes -1 byte zopfli --i1000 --mls8 --bsr7 --lazy --ohh January 28, 2020 @ 15:40
53304 bytes -1 byte zopfli --i1000 --mls4 --bsr22 --lazy --ohh January 28, 2020 @ 13:53
53305 bytes -2 bytes zopfli --i1000 --mls128 --bsr19 --lazy --ohh January 28, 2020 @ 13:51
53307 bytes zopfli --i100 --mls16 --bsr22 --lazy --ohh January 28, 2020 @ 13:16

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

Most recent activity on February 24, 2020 @ 21:09.

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
53299 53300 53302 53302 53300 53299 53299 53300 53300 53301 53313 53311 53313 53326 53321
53330 53297 53299 53301 53302 53310 53301 53299 53302 53299 53306 53309 53313 53308 53312
53339 53298 53297 53299 53299 53301 53297 53305 53305 53298 53306 53303 53303 53310 53309
53343 53335 53288 53333 53300 53309 53302 53304 53302 53300 53318 53305 53300 53318 53305
53326 53288 53333 53300 53298 53312 53299 53299 53304 53310 53312 53310 53317 53311 53308
53306 53288 53299 53301 53300 53301 53288 53298 53303 53303 53306 53307 53304 53328 53308
53297 53297 53298 53297 53302 53310 53299 53302 53303 53304 53307 53337 53304 53306 53314
53298 53288 53297 53300 53298 53313 53288 53297 53303 53305 53306 53311 53305 53324 53322
53329 53324 53329 53300 53302 53300 53299 53297 53303 53304 53305 53303 53303 53308 53316
53330 53298 53299 53301 53299 53311 53299 53297 53303 53311 53306 53305 53309 53310 53310
53298 53298 53298 53331 53301 53302 53299 53300 53303 53312 53307 53309 53305 53307 53310
53297 53298 53299 53300 53298 53302 53299 53299 53305 53298 53316 53305 53304 53322 53312
53323 53325 53328 53329 53298 53301 53296 53305 53305 53303 53305 53307 53311 53321 53310
53325 53326 53301 53301 53299 53298 53296 53303 53304 53307 53307 53311 53312 53307 53311
53298 53288 53298 53300 53297 53301 53298 53299 53303 53305 53307 53305 53303 53313 53310
53327 53288 53298 53298 53299 53303 53288 53297 53303 53305 53307 53305 53311 53313 53305
53337 53299 53297 53299 53298 53300 53307 53303 53303 53304 53302 53305 53303 53314 53305
53325 53327 53331 53300 53300 53300 53288 53298 53303 53305 53307 53309 53303 53315 53311
53329 53288 53299 53300 53300 53296 53288 53298 53305 53306 53320 53304 53304 53308 53311
53299 53300 53297 53298 53298 53319 53299 53303 53303 53306 53312 53306 53307 53324 53304
53329 53323 53324 53298 53298 53296 53304 53297 53304 53308 53307 53305 53306 53309 53312
53325 53322 53300 53298 53298 53314 53299 53301 53306 53305 53307 53305 53303 53322 53309
53331 53297 53299 53301 53299 53300 53297 53299 53303 53305 53311 53307 53308 53323 53309

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 53307 bytes 100%
1,000 53303 bytes -4 bytes 100%
10,000 53295 bytes -8 bytes 100%
100,000 53288 bytes -7 bytes 3.48%
1,000,000 53288 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
53466 bytes +178 bytes (+0.33%) +87 bytes
53379 bytes +91 bytes (+0.17%)
53412 bytes +124 bytes (+0.23%) +33 bytes
53436 bytes +148 bytes (+0.28%) +57 bytes
53457 bytes +169 bytes (+0.32%) +78 bytes
53477 bytes +189 bytes (+0.35%) +98 bytes
53457 bytes +169 bytes (+0.32%) +78 bytes
53497 bytes +209 bytes (+0.39%) +118 bytes
53528 bytes +240 bytes (+0.45%) +149 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 39171 bytes -14117 bytes (-26.49%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46764 bytes -6524 bytes (-12.24%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47723 bytes -5565 bytes (-10.44%)
Brotli (Wikipedia) brotli brotli -q 11 49196 bytes -4092 bytes (-7.68%)
LZMA2 (Wikipedia) xz xz -9 50272 bytes -3016 bytes (-5.66%)
Zstandard (Wikipedia) zstd zstd -19 51613 bytes -1675 bytes (-3.14%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51843 bytes -1445 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 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.