Choose a version:
26% The original file has 637186 bytes (622.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167223 bytes (163.3k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  56228 bytes (54.9k)
local copy
gzip -9
  56167 bytes (54.9k)
local copy
7zip -mx=9 -tgzip
  53478 bytes (52.2k)
local copy
libdeflate -12
  53475 bytes (52.2k)
local copy
kzip -s0 -rn -b1
  53403 bytes (52.2k)
local copy
pigz -11 -n
  53377 bytes (52.1k)
local copy
Zopfli
  53302 bytes (52.1k)
local copy
Zopfli (defluff)
  53298 bytes (52.0k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.13.4.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.13.4 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 --bsr25 --lazy --ohh

(found February 22, 2019)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 64  --mls64
block splitting recursion 25  --bsr25
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 (53298 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.4/dojo.js --location | md5sum
bd7e6b9fb1155d7aef77c440e022ec46  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.4.min.zopfli.js.gz | md5sum
bd7e6b9fb1155d7aef77c440e022ec46  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.4/dojo.js --location | sha1sum
6643a760e156da946f3706ec13fbc1c3e90603ec  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.4.min.zopfli.js.gz | sha1sum
6643a760e156da946f3706ec13fbc1c3e90603ec  -

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
53302 bytes -1 byte zopfli --i1000000 --mls64 --bsr25 --lazy --ohh February 22, 2019 @ 06:17
53303 bytes -8 bytes zopfli --i100000 --mls4 --bsr11 --lazy --ohh February 20, 2019 @ 00:36
53311 bytes -2 bytes zopfli --i10000 --mls4 --bsr11 --lazy --ohh February 19, 2019 @ 14:42
53313 bytes -2 bytes zopfli --i10000 --mls4 --bsr6 --lazy --ohh February 19, 2019 @ 14:21
53315 bytes -2 bytes zopfli --i10000 --mls512 --bsr2 --lazy --ohh February 19, 2019 @ 13:35
53317 bytes -1 byte zopfli --i1000 --mls4 --bsr18 --lazy --ohh February 19, 2019 @ 10:06
53318 bytes -1 byte zopfli --i1000 --mls4 --bsr11 --lazy --ohh February 19, 2019 @ 09:10
53319 bytes -1 byte zopfli --i1000 --mls4 --bsr14 --lazy --ohh February 19, 2019 @ 08:53
53320 bytes -1 byte zopfli --i1000 --mls256 --bsr12 --lazy --ohh February 19, 2019 @ 07:48
53321 bytes zopfli --i100 --mls256 --bsr30 --lazy --ohh February 18, 2019 @ 20:58

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 @ 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
53313 53317 53317 53318 53314 53316 53315 53316 53315 53317 53333 53331 53327 53346 53337
53345 53312 53315 53316 53318 53323 53317 53312 53316 53306 53321 53328 53331 53327 53326
53344 53313 53313 53315 53315 53318 53302 53324 53320 53313 53319 53321 53322 53332 53323
53357 53304 53313 53316 53315 53313 53303 53317 53321 53315 53333 53324 53316 53334 53322
53346 53304 53347 53315 53312 53324 53312 53314 53325 53328 53327 53329 53334 53326 53327
53313 53304 53315 53316 53317 53319 53314 53312 53320 53321 53324 53322 53323 53339 53329
53312 53312 53313 53313 53317 53327 53313 53316 53321 53345 53316 53316 53322 53327 53326
53313 53303 53312 53315 53317 53325 53311 53312 53321 53325 53324 53328 53327 53328 53333
53339 53342 53341 53315 53317 53319 53312 53311 53321 53314 53318 53320 53326 53326 53328
53344 53314 53314 53316 53315 53313 53314 53318 53320 53345 53324 53324 53328 53334 53325
53314 53312 53314 53346 53317 53319 53314 53315 53320 53334 53325 53323 53331 53332 53325
53342 53337 53314 53315 53318 53318 53311 53321 53321 53316 53330 53325 53322 53337 53325
53346 53343 53339 53346 53314 53311 53311 53314 53320 53314 53325 53323 53327 53336 53321
53336 53304 53317 53316 53314 53314 53311 53312 53320 53334 53323 53330 53325 53322 53325
53313 53304 53313 53315 53314 53318 53311 53313 53321 53325 53326 53324 53321 53331 53329
53340 53311 53314 53315 53314 53316 53311 53314 53322 53344 53329 53323 53324 53332 53320
53339 53312 53314 53314 53313 53315 53322 53321 53321 53322 53315 53323 53322 53326 53321
53338 53339 53335 53314 53314 53318 53315 53314 53320 53314 53325 53328 53325 53331 53329
53343 53311 53315 53315 53315 53314 53311 53313 53325 53347 53326 53326 53323 53325 53328
53313 53313 53314 53315 53313 53334 53312 53321 53321 53313 53325 53325 53323 53339 53322
53344 53341 53340 53315 53313 53302 53321 53311 53326 53334 53325 53325 53323 53324 53328
53342 53336 53316 53315 53313 53328 53314 53313 53321 53325 53322 53325 53325 53334 53325
53344 53313 53313 53317 53314 53315 53312 53314 53320 53312 53329 53322 53331 53333 53325

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 53321 bytes 100%
1,000 53317 bytes -4 bytes 100%
10,000 53310 bytes -7 bytes 100%
100,000 53303 bytes -7 bytes 2.90%
1,000,000 53302 bytes -1 byte 1.16%
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
53476 bytes +174 bytes (+0.33%) +73 bytes
53403 bytes +101 bytes (+0.19%)
53428 bytes +126 bytes (+0.24%) +25 bytes
53449 bytes +147 bytes (+0.28%) +46 bytes
53476 bytes +174 bytes (+0.33%) +73 bytes
53486 bytes +184 bytes (+0.35%) +83 bytes
53474 bytes +172 bytes (+0.32%) +71 bytes
53515 bytes +213 bytes (+0.40%) +112 bytes
53540 bytes +238 bytes (+0.45%) +137 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 39184 bytes -14118 bytes (-26.49%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46781 bytes -6521 bytes (-12.23%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47742 bytes -5560 bytes (-10.43%)
Brotli (Wikipedia) brotli brotli -q 11 49217 bytes -4085 bytes (-7.66%)
LZMA2 (Wikipedia) xz xz -9 50288 bytes -3014 bytes (-5.65%)
Zstandard (Wikipedia) zstd zstd -19 51629 bytes -1673 bytes (-3.14%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51928 bytes -1374 bytes (-2.58%)

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