Choose a version:
26% The original file has 637973 bytes (623.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167132 bytes (163.2k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  56225 bytes (54.9k)
local copy
gzip -9
  56154 bytes (54.8k)
local copy
libdeflate -12
  53501 bytes (52.2k)
local copy
7zip -mx=9 -tgzip
  53467 bytes (52.2k)
local copy
kzip -s0 -rn -b1
  53386 bytes (52.1k)
local copy
pigz -11 -n
  53369 bytes (52.1k)
local copy
Zopfli
  53296 bytes (52.0k)
local copy
Zopfli (defluff)
  53292 bytes (52.0k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.14.1.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.14.1 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 --mls128 --bsr12 --lazy --ohh

(found August 31, 2018)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 128  --mls128
block splitting recursion 12  --bsr12
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 (53292 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.14.1/dojo.js --location | md5sum
e0a59d739b7bdf3bf43cf9a30018fdc6  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.1.min.zopfli.js.gz | md5sum
e0a59d739b7bdf3bf43cf9a30018fdc6  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.14.1/dojo.js --location | sha1sum
120212a9bc1560a02e9124a73b1ca1a5f0802d69  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.1.min.zopfli.js.gz | sha1sum
120212a9bc1560a02e9124a73b1ca1a5f0802d69  -

Other Versions

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

1.14.1, 1.14.0,
1.13.1, 1.13.0,
1.12.3, 1.12.2, 1.12.1,
1.11.5, 1.11.4, 1.11.3, 1.11.2, 1.11.1, 1.11.0,
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,
1.7.10, 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
53296 bytes -2 bytes zopfli --i100000 --mls128 --bsr12 --lazy --ohh August 31, 2018 @ 22:19
53298 bytes -1 byte zopfli --i10000 --mls128 --bsr12 --lazy --ohh August 31, 2018 @ 20:39
53299 bytes -1 byte zopfli --i10000 --mls8 --bsr18 --lazy --ohh August 31, 2018 @ 20:25
53300 bytes -1 byte zopfli --i10000 --mls4 --bsr14 --lazy --ohh August 31, 2018 @ 20:20
53301 bytes -4 bytes zopfli --i10000 --mls256 --bsr6 --lazy --ohh August 31, 2018 @ 20:09
53305 bytes -1 byte zopfli --i1000 --mls256 --bsr6 --lazy --ohh August 31, 2018 @ 19:27
53306 bytes -1 byte zopfli --i1000 --mls4 --bsr14 --lazy --ohh August 31, 2018 @ 19:27
53307 bytes -1 byte zopfli --i1000 --mls8 --bsr16 --lazy --ohh August 31, 2018 @ 19:27
53308 bytes zopfli --i100 --mls256 --bsr6 --lazy --ohh August 31, 2018 @ 19:07

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

Most recent activity on September 1, 2018 @ 16:58.

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
53302 53302 53303 53303 53304 53302 53306 53300 53322 53305 53305 53305 53315 53332 53323
53339 53305 53305 53305 53305 53315 53303 53301 53309 53305 53322 53306 53314 53322 53310
53334 53303 53300 53303 53302 53317 53315 53301 53311 53309 53317 53321 53313 53318 53316
53334 53343 53302 53341 53317 53312 53307 53302 53305 53309 53318 53301 53306 53320 53313
53337 53332 53334 53340 53303 53314 53299 53301 53309 53309 53320 53309 53316 53320 53319
53312 53341 53304 53301 53301 53313 53302 53301 53309 53309 53322 53316 53314 53320 53318
53343 53341 53304 53300 53315 53314 53302 53300 53309 53312 53315 53302 53303 53321 53324
53337 53339 53310 53316 53303 53313 53301 53303 53303 53309 53312 53302 53315 53308 53310
53337 53334 53336 53344 53301 53317 53296 53302 53309 53309 53315 53316 53315 53314 53314
53330 53345 53300 53303 53304 53314 53299 53301 53309 53309 53312 53301 53301 53309 53317
53301 53300 53334 53308 53304 53314 53299 53302 53310 53310 53311 53306 53315 53326 53308
53336 53341 53302 53302 53318 53313 53299 53302 53309 53310 53316 53302 53301 53314 53324
53341 53334 53299 53339 53304 53301 53299 53300 53309 53319 53313 53305 53313 53314 53320
53333 53333 53336 53339 53304 53301 53299 53301 53310 53309 53315 53307 53315 53315 53319
53345 53335 53299 53302 53301 53300 53299 53300 53309 53308 53315 53301 53315 53321 53319
53301 53341 53338 53337 53305 53314 53299 53303 53310 53309 53315 53319 53315 53321 53324
53345 53332 53336 53300 53303 53314 53299 53309 53309 53309 53311 53307 53315 53310 53326
53336 53331 53304 53302 53300 53311 53299 53299 53309 53309 53314 53302 53315 53313 53324
53337 53333 53337 53302 53303 53318 53299 53304 53309 53309 53311 53313 53315 53317 53309
53306 53346 53342 53301 53301 53313 53296 53301 53309 53309 53314 53301 53316 53315 53319
53335 53334 53304 53339 53302 53313 53299 53309 53313 53309 53316 53301 53316 53318 53320
53335 53341 53300 53336 53305 53300 53300 53302 53309 53309 53315 53310 53314 53319 53319
53335 53341 53304 53337 53304 53314 53297 53299 53309 53309 53311 53307 53314 53320 53319

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 53308 bytes 100%
1,000 53305 bytes -3 bytes 100%
10,000 53298 bytes -7 bytes 100%
100,000 53296 bytes -2 bytes 0.87%
1,000,000 53296 bytes 0.58%
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
53471 bytes +175 bytes (+0.33%) +85 bytes
53386 bytes +90 bytes (+0.17%)
53412 bytes +116 bytes (+0.22%) +26 bytes
53444 bytes +148 bytes (+0.28%) +58 bytes
53472 bytes +176 bytes (+0.33%) +86 bytes
53465 bytes +169 bytes (+0.32%) +79 bytes
53470 bytes +174 bytes (+0.33%) +84 bytes
53510 bytes +214 bytes (+0.40%) +124 bytes
53546 bytes +250 bytes (+0.47%) +160 bytes

Non-DEFLATE Algorithms

Archivers based on completely different compression algorithms often produce superior results.
Unfortunately, browsers only support gzip compression at the moment.
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 39124 bytes -14172 bytes (-26.59%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46764 bytes -6532 bytes (-12.26%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47720 bytes -5576 bytes (-10.46%)
Brotli (Wikipedia) brotli brotli -q 11 49212 bytes -4084 bytes (-7.66%)
LZMA2 (Wikipedia) xz xz -9 50272 bytes -3024 bytes (-5.67%)
Zstandard (Wikipedia) zstd zstd -19 51722 bytes -1574 bytes (-2.95%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51923 bytes -1373 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 2018.
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