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)
  56213 bytes (54.9k)
local copy
gzip -9
  56151 bytes (54.8k)
local copy
libdeflate -12
  53461 bytes (52.2k)
local copy
7zip -mx=9 -tgzip
  53435 bytes (52.2k)
local copy
zultra
  53393 bytes (52.1k)
local copy
kzip -s0 -rn -b1
  53390 bytes (52.1k)
local copy
pigz -11 -n
  53356 bytes (52.1k)
local copy
Zopfli
  53287 bytes (52.0k)
local copy
Zopfli (defluff)
  53283 bytes (52.0k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.13.6.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.13.6 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 --mls4 --bsr18 --lazy --ohh

(found March 11, 2022)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 4  --mls4
block splitting recursion 18  --bsr18
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 (53283 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.6/dojo.js --location | md5sum
9679c48bc40813f8949f72242068678c  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.6.min.zopfli.js.gz | md5sum
9679c48bc40813f8949f72242068678c  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.6/dojo.js --location | sha1sum
5a72b83b4a1f80919f40f162ffb7c39029044c46  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.6.min.zopfli.js.gz | sha1sum
5a72b83b4a1f80919f40f162ffb7c39029044c46  -

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
53287 bytes -1 byte zopfli --i1000000 --mls4 --bsr18 --lazy --ohh March 11, 2022 @ 18:54
53288 bytes -8 bytes zopfli --i100000 --mls4 --bsr18 --lazy --ohh March 4, 2022 @ 11:55
53296 bytes -2 bytes zopfli --i10000 --mls4 --bsr18 --lazy --ohh February 25, 2022 @ 11:02
53298 bytes -4 bytes zopfli --i10000 --mls32 --bsr7 --lazy --ohh February 25, 2022 @ 09:12
53302 bytes -1 byte zopfli --i10000 --mls256 --bsr7 --lazy --ohh February 25, 2022 @ 08:22
53303 bytes -1 byte zopfli --i1000 --mls8 --bsr7 --lazy --ohh February 24, 2022 @ 19:32
53304 bytes -1 byte zopfli --i1000 --mls128 --bsr11 --lazy --ohh February 24, 2022 @ 17:14
53305 bytes -1 byte zopfli --i1000 --mls128 --bsr16 --lazy --ohh February 24, 2022 @ 17:06
53306 bytes zopfli --i100 --mls4 --bsr18 --lazy --ohh February 24, 2022 @ 15:42

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

Most recent activity on March 12, 2022 @ 09:16.

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
53300 53299 53302 53302 53300 53299 53299 53300 53300 53301 53314 53316 53313 53326 53323
53330 53298 53299 53301 53303 53311 53300 53297 53300 53299 53306 53309 53313 53312 53312
53332 53299 53299 53298 53299 53299 53297 53308 53305 53297 53303 53304 53304 53317 53311
53340 53336 53298 53335 53298 53311 53307 53302 53302 53308 53318 53306 53303 53324 53305
53329 53289 53332 53300 53290 53312 53299 53298 53306 53310 53312 53305 53319 53309 53308
53306 53289 53298 53300 53298 53302 53297 53298 53302 53304 53306 53303 53304 53324 53313
53297 53297 53298 53338 53300 53310 53299 53303 53303 53304 53308 53299 53307 53306 53310
53297 53288 53297 53300 53304 53313 53297 53298 53303 53305 53306 53311 53305 53324 53323
53325 53324 53323 53299 53300 53300 53299 53297 53303 53304 53305 53305 53303 53313 53316
53331 53297 53298 53300 53298 53311 53300 53297 53303 53314 53307 53306 53309 53320 53310
53298 53298 53298 53331 53302 53303 53299 53300 53305 53312 53307 53309 53308 53307 53312
53289 53298 53299 53300 53297 53303 53300 53299 53306 53291 53316 53306 53308 53316 53313
53323 53325 53330 53330 53297 53301 53298 53305 53305 53303 53308 53307 53311 53321 53312
53325 53323 53300 53300 53298 53299 53298 53306 53303 53307 53307 53311 53315 53311 53313
53297 53287 53298 53299 53297 53301 53297 53299 53303 53305 53307 53306 53307 53313 53306
53297 53289 53299 53298 53298 53303 53297 53297 53303 53305 53308 53305 53314 53313 53305
53335 53299 53299 53300 53297 53300 53304 53306 53303 53304 53302 53305 53303 53312 53307
53325 53323 53324 53299 53300 53301 53297 53289 53303 53305 53308 53309 53303 53321 53311
53329 53289 53298 53299 53298 53297 53297 53299 53305 53305 53320 53304 53304 53307 53311
53298 53300 53297 53298 53297 53318 53299 53303 53303 53306 53307 53306 53307 53324 53308
53329 53323 53324 53300 53297 53288 53306 53298 53304 53304 53308 53306 53306 53309 53317
53325 53323 53300 53300 53299 53314 53299 53301 53306 53305 53307 53306 53303 53317 53313
53332 53289 53299 53301 53298 53300 53299 53300 53303 53305 53311 53303 53308 53318 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 53306 bytes 100%
1,000 53303 bytes -3 bytes 100%
10,000 53296 bytes -7 bytes 100%
100,000 53288 bytes -8 bytes 3.48%
1,000,000 53287 bytes -1 byte 0.87%
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
53468 bytes +181 bytes (+0.34%) +78 bytes
53390 bytes +103 bytes (+0.19%)
53421 bytes +134 bytes (+0.25%) +31 bytes
53439 bytes +152 bytes (+0.29%) +49 bytes
53468 bytes +181 bytes (+0.34%) +78 bytes
53473 bytes +186 bytes (+0.35%) +83 bytes
53465 bytes +178 bytes (+0.33%) +75 bytes
53502 bytes +215 bytes (+0.40%) +112 bytes
53531 bytes +244 bytes (+0.46%) +141 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 -14116 bytes (-26.49%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46771 bytes -6516 bytes (-12.23%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47724 bytes -5563 bytes (-10.44%)
Brotli (Wikipedia) brotli brotli -q 11 49182 bytes -4105 bytes (-7.70%)
LZMA2 (Wikipedia) xz xz -9 50280 bytes -3007 bytes (-5.64%)
Zstandard (Wikipedia) zstd zstd -19 51611 bytes -1676 bytes (-3.15%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51934 bytes -1353 bytes (-2.54%)

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.